Revert "Delete CC."

cc/output/gl_renderer.cc

+// Copyright 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cc/output/gl_renderer.h"
+
+#include <algorithm>
+#include <limits>
+#include <set>
+#include <string>
+#include <vector>
+
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
+#include "build/build_config.h"
+#include "base/trace_event/trace_event.h"
+#include "cc/base/math_util.h"
+#include "cc/output/compositor_frame.h"
+#include "cc/output/compositor_frame_metadata.h"
+#include "cc/output/context_provider.h"
+#include "cc/output/copy_output_request.h"
+#include "cc/output/dynamic_geometry_binding.h"
+#include "cc/output/gl_frame_data.h"
+#include "cc/output/output_surface.h"
+#include "cc/output/render_surface_filters.h"
+#include "cc/output/static_geometry_binding.h"
+#include "cc/quads/draw_polygon.h"
+#include "cc/quads/render_pass.h"
+#include "cc/quads/stream_video_draw_quad.h"
+#include "cc/quads/texture_draw_quad.h"
+#include "cc/resources/layer_quad.h"
+#include "cc/resources/scoped_resource.h"
+#include "cc/resources/texture_mailbox_deleter.h"
+#include "gpu/GLES2/gl2extchromium.h"
+#include "gpu/command_buffer/client/context_support.h"
+#include "gpu/command_buffer/client/gles2_interface.h"
+#include "gpu/command_buffer/common/gpu_memory_allocation.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkColorFilter.h"
+#include "third_party/skia/include/core/SkImage.h"
+#include "third_party/skia/include/core/SkSurface.h"
+#include "third_party/skia/include/gpu/GrContext.h"
+#include "third_party/skia/include/gpu/GrTexture.h"
+#include "third_party/skia/include/gpu/SkGrTexturePixelRef.h"
+#include "third_party/skia/include/gpu/gl/GrGLInterface.h"
+#include "ui/gfx/geometry/quad_f.h"
+#include "ui/gfx/geometry/rect_conversions.h"
+
+using gpu::gles2::GLES2Interface;
+
+namespace cc {
+namespace {
+
+bool NeedsIOSurfaceReadbackWorkaround() {
+#if defined(OS_MACOSX)
+  // This isn't strictly required in DumpRenderTree-mode when Mesa is used,
+  // but it doesn't seem to hurt.
+  return true;
+#else
+  return false;
+#endif
+}
+
+Float4 UVTransform(const TextureDrawQuad* quad) {
+  gfx::PointF uv0 = quad->uv_top_left;
+  gfx::PointF uv1 = quad->uv_bottom_right;
+  Float4 xform = {{uv0.x(), uv0.y(), uv1.x() - uv0.x(), uv1.y() - uv0.y()}};
+  if (quad->flipped) {
+    xform.data[1] = 1.0f - xform.data[1];
+    xform.data[3] = -xform.data[3];
+  }
+  return xform;
+}
+
+Float4 PremultipliedColor(SkColor color) {
+  const float factor = 1.0f / 255.0f;
+  const float alpha = SkColorGetA(color) * factor;
+
+  Float4 result = {
+      {SkColorGetR(color) * factor * alpha, SkColorGetG(color) * factor * alpha,
+       SkColorGetB(color) * factor * alpha, alpha}};
+  return result;
+}
+
+SamplerType SamplerTypeFromTextureTarget(GLenum target) {
+  switch (target) {
+    case GL_TEXTURE_2D:
+      return SAMPLER_TYPE_2D;
+    case GL_TEXTURE_RECTANGLE_ARB:
+      return SAMPLER_TYPE_2D_RECT;
+    case GL_TEXTURE_EXTERNAL_OES:
+      return SAMPLER_TYPE_EXTERNAL_OES;
+    default:
+      NOTREACHED();
+      return SAMPLER_TYPE_2D;
+  }
+}
+
+BlendMode BlendModeFromSkXfermode(SkXfermode::Mode mode) {
+  switch (mode) {
+    case SkXfermode::kSrcOver_Mode:
+      return BLEND_MODE_NORMAL;
+    case SkXfermode::kScreen_Mode:
+      return BLEND_MODE_SCREEN;
+    case SkXfermode::kOverlay_Mode:
+      return BLEND_MODE_OVERLAY;
+    case SkXfermode::kDarken_Mode:
+      return BLEND_MODE_DARKEN;
+    case SkXfermode::kLighten_Mode:
+      return BLEND_MODE_LIGHTEN;
+    case SkXfermode::kColorDodge_Mode:
+      return BLEND_MODE_COLOR_DODGE;
+    case SkXfermode::kColorBurn_Mode:
+      return BLEND_MODE_COLOR_BURN;
+    case SkXfermode::kHardLight_Mode:
+      return BLEND_MODE_HARD_LIGHT;
+    case SkXfermode::kSoftLight_Mode:
+      return BLEND_MODE_SOFT_LIGHT;
+    case SkXfermode::kDifference_Mode:
+      return BLEND_MODE_DIFFERENCE;
+    case SkXfermode::kExclusion_Mode:
+      return BLEND_MODE_EXCLUSION;
+    case SkXfermode::kMultiply_Mode:
+      return BLEND_MODE_MULTIPLY;
+    case SkXfermode::kHue_Mode:
+      return BLEND_MODE_HUE;
+    case SkXfermode::kSaturation_Mode:
+      return BLEND_MODE_SATURATION;
+    case SkXfermode::kColor_Mode:
+      return BLEND_MODE_COLOR;
+    case SkXfermode::kLuminosity_Mode:
+      return BLEND_MODE_LUMINOSITY;
+    default:
+      NOTREACHED();
+      return BLEND_MODE_NONE;
+  }
+}
+
+// Smallest unit that impact anti-aliasing output. We use this to
+// determine when anti-aliasing is unnecessary.
+const float kAntiAliasingEpsilon = 1.0f / 1024.0f;
+
+// Block or crash if the number of pending sync queries reach this high as
+// something is seriously wrong on the service side if this happens.
+const size_t kMaxPendingSyncQueries = 16;
+
+}  // anonymous namespace
+
+static GLint GetActiveTextureUnit(GLES2Interface* gl) {
+  GLint active_unit = 0;
+  gl->GetIntegerv(GL_ACTIVE_TEXTURE, &active_unit);
+  return active_unit;
+}
+
+struct GLRenderer::PendingAsyncReadPixels {
+  PendingAsyncReadPixels() : buffer(0) {}
+
+  scoped_ptr<CopyOutputRequest> copy_request;
+  base::CancelableClosure finished_read_pixels_callback;
+  unsigned buffer;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PendingAsyncReadPixels);
+};
+
+class GLRenderer::SyncQuery {
+ public:
+  explicit SyncQuery(gpu::gles2::GLES2Interface* gl)
+      : gl_(gl), query_id_(0u), is_pending_(false), weak_ptr_factory_(this) {
+    gl_->GenQueriesEXT(1, &query_id_);
+  }
+  virtual ~SyncQuery() { gl_->DeleteQueriesEXT(1, &query_id_); }
+
+  scoped_refptr<ResourceProvider::Fence> Begin() {
+    DCHECK(!IsPending());
+    // Invalidate weak pointer held by old fence.
+    weak_ptr_factory_.InvalidateWeakPtrs();
+    // Note: In case the set of drawing commands issued before End() do not
+    // depend on the query, defer BeginQueryEXT call until Set() is called and
+    // query is required.
+    return make_scoped_refptr<ResourceProvider::Fence>(
+        new Fence(weak_ptr_factory_.GetWeakPtr()));
+  }
+
+  void Set() {
+    if (is_pending_)
+      return;
+
+    // Note: BeginQueryEXT on GL_COMMANDS_COMPLETED_CHROMIUM is effectively a
+    // noop relative to GL, so it doesn't matter where it happens but we still
+    // make sure to issue this command when Set() is called (prior to issuing
+    // any drawing commands that depend on query), in case some future extension
+    // can take advantage of this.
+    gl_->BeginQueryEXT(GL_COMMANDS_COMPLETED_CHROMIUM, query_id_);
+    is_pending_ = true;
+  }
+
+  void End() {
+    if (!is_pending_)
+      return;
+
+    gl_->EndQueryEXT(GL_COMMANDS_COMPLETED_CHROMIUM);
+  }
+
+  bool IsPending() {
+    if (!is_pending_)
+      return false;
+
+    unsigned result_available = 1;
+    gl_->GetQueryObjectuivEXT(
+        query_id_, GL_QUERY_RESULT_AVAILABLE_EXT, &result_available);
+    is_pending_ = !result_available;
+    return is_pending_;
+  }
+
+  void Wait() {
+    if (!is_pending_)
+      return;
+
+    unsigned result = 0;
+    gl_->GetQueryObjectuivEXT(query_id_, GL_QUERY_RESULT_EXT, &result);
+    is_pending_ = false;
+  }
+
+ private:
+  class Fence : public ResourceProvider::Fence {
+   public:
+    explicit Fence(base::WeakPtr<GLRenderer::SyncQuery> query)
+        : query_(query) {}
+
+    // Overridden from ResourceProvider::Fence:
+    void Set() override {
+      DCHECK(query_);
+      query_->Set();
+    }
+    bool HasPassed() override { return !query_ || !query_->IsPending(); }
+    void Wait() override {
+      if (query_)
+        query_->Wait();
+    }
+
+   private:
+    ~Fence() override {}
+
+    base::WeakPtr<SyncQuery> query_;
+
+    DISALLOW_COPY_AND_ASSIGN(Fence);
+  };
+
+  gpu::gles2::GLES2Interface* gl_;
+  unsigned query_id_;
+  bool is_pending_;
+  base::WeakPtrFactory<SyncQuery> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(SyncQuery);
+};
+
+scoped_ptr<GLRenderer> GLRenderer::Create(
+    RendererClient* client,
+    const RendererSettings* settings,
+    OutputSurface* output_surface,
+    ResourceProvider* resource_provider,
+    TextureMailboxDeleter* texture_mailbox_deleter,
+    int highp_threshold_min) {
+  return make_scoped_ptr(new GLRenderer(client,
+                                        settings,
+                                        output_surface,
+                                        resource_provider,
+                                        texture_mailbox_deleter,
+                                        highp_threshold_min));
+}
+
+GLRenderer::GLRenderer(RendererClient* client,
+                       const RendererSettings* settings,
+                       OutputSurface* output_surface,
+                       ResourceProvider* resource_provider,
+                       TextureMailboxDeleter* texture_mailbox_deleter,
+                       int highp_threshold_min)
+    : DirectRenderer(client, settings, output_surface, resource_provider),
+      offscreen_framebuffer_id_(0),
+      shared_geometry_quad_(QuadVertexRect()),
+      gl_(output_surface->context_provider()->ContextGL()),
+      context_support_(output_surface->context_provider()->ContextSupport()),
+      texture_mailbox_deleter_(texture_mailbox_deleter),
+      is_backbuffer_discarded_(false),
+      is_scissor_enabled_(false),
+      scissor_rect_needs_reset_(true),
+      stencil_shadow_(false),
+      blend_shadow_(false),
+      highp_threshold_min_(highp_threshold_min),
+      highp_threshold_cache_(0),
+      use_sync_query_(false),
+      on_demand_tile_raster_resource_id_(0),
+      bound_geometry_(NO_BINDING) {
+  DCHECK(gl_);
+  DCHECK(context_support_);
+
+  ContextProvider::Capabilities context_caps =
+      output_surface_->context_provider()->ContextCapabilities();
+
+  capabilities_.using_partial_swap =
+      settings_->partial_swap_enabled && context_caps.gpu.post_sub_buffer;
+
+  DCHECK(!context_caps.gpu.iosurface || context_caps.gpu.texture_rectangle);
+
+  capabilities_.using_egl_image = context_caps.gpu.egl_image_external;
+
+  capabilities_.max_texture_size = resource_provider_->max_texture_size();
+  capabilities_.best_texture_format = resource_provider_->best_texture_format();
+
+  // The updater can access textures while the GLRenderer is using them.
+  capabilities_.allow_partial_texture_updates = true;
+
+  capabilities_.using_image = context_caps.gpu.image;
+
+  capabilities_.using_discard_framebuffer =
+      context_caps.gpu.discard_framebuffer;
+
+  capabilities_.allow_rasterize_on_demand = true;
+
+  use_sync_query_ = context_caps.gpu.sync_query;
+  use_blend_equation_advanced_ = context_caps.gpu.blend_equation_advanced;
+  use_blend_equation_advanced_coherent_ =
+      context_caps.gpu.blend_equation_advanced_coherent;
+
+  InitializeSharedObjects();
+}
+
+GLRenderer::~GLRenderer() {
+  while (!pending_async_read_pixels_.empty()) {
+    PendingAsyncReadPixels* pending_read = pending_async_read_pixels_.back();
+    pending_read->finished_read_pixels_callback.Cancel();
+    pending_async_read_pixels_.pop_back();
+  }
+
+  in_use_overlay_resources_.clear();
+
+  CleanupSharedObjects();
+}
+
+const RendererCapabilitiesImpl& GLRenderer::Capabilities() const {
+  return capabilities_;
+}
+
+void GLRenderer::DebugGLCall(GLES2Interface* gl,
+                             const char* command,
+                             const char* file,
+                             int line) {
+  GLuint error = gl->GetError();
+  if (error != GL_NO_ERROR)
+    LOG(ERROR) << "GL command failed: File: " << file << "\n\tLine " << line
+               << "\n\tcommand: " << command << ", error "
+               << static_cast<int>(error) << "\n";
+}
+
+void GLRenderer::DidChangeVisibility() {
+  EnforceMemoryPolicy();
+
+  context_support_->SetSurfaceVisible(visible());
+}
+
+void GLRenderer::ReleaseRenderPassTextures() { render_pass_textures_.clear(); }
+
+void GLRenderer::DiscardPixels() {
+  if (!capabilities_.using_discard_framebuffer)
+    return;
+  bool using_default_framebuffer =
+      !current_framebuffer_lock_ &&
+      output_surface_->capabilities().uses_default_gl_framebuffer;
+  GLenum attachments[] = {static_cast<GLenum>(
+      using_default_framebuffer ? GL_COLOR_EXT : GL_COLOR_ATTACHMENT0_EXT)};
+  gl_->DiscardFramebufferEXT(
+      GL_FRAMEBUFFER, arraysize(attachments), attachments);
+}
+
+void GLRenderer::PrepareSurfaceForPass(
+    DrawingFrame* frame,
+    SurfaceInitializationMode initialization_mode,
+    const gfx::Rect& render_pass_scissor) {
+  switch (initialization_mode) {
+    case SURFACE_INITIALIZATION_MODE_PRESERVE:
+      EnsureScissorTestDisabled();
+      return;
+    case SURFACE_INITIALIZATION_MODE_FULL_SURFACE_CLEAR:
+      EnsureScissorTestDisabled();
+      DiscardPixels();
+      ClearFramebuffer(frame);
+      break;
+    case SURFACE_INITIALIZATION_MODE_SCISSORED_CLEAR:
+      SetScissorTestRect(render_pass_scissor);
+      ClearFramebuffer(frame);
+      break;
+  }
+}
+
+void GLRenderer::ClearFramebuffer(DrawingFrame* frame) {
+  // On DEBUG builds, opaque render passes are cleared to blue to easily see
+  // regions that were not drawn on the screen.
+  if (frame->current_render_pass->has_transparent_background)
+    GLC(gl_, gl_->ClearColor(0, 0, 0, 0));
+  else
+    GLC(gl_, gl_->ClearColor(0, 0, 1, 1));
+
+  bool always_clear = false;
+#ifndef NDEBUG
+  always_clear = true;
+#endif
+  if (always_clear || frame->current_render_pass->has_transparent_background) {
+    GLbitfield clear_bits = GL_COLOR_BUFFER_BIT;
+    if (always_clear)
+      clear_bits |= GL_STENCIL_BUFFER_BIT;
+    gl_->Clear(clear_bits);
+  }
+}
+
+static ResourceProvider::ResourceId WaitOnResourceSyncPoints(
+    ResourceProvider* resource_provider,
+    ResourceProvider::ResourceId resource_id) {
+  resource_provider->WaitSyncPointIfNeeded(resource_id);
+  return resource_id;
+}
+
+void GLRenderer::BeginDrawingFrame(DrawingFrame* frame) {
+  TRACE_EVENT0("cc", "GLRenderer::BeginDrawingFrame");
+
+  scoped_refptr<ResourceProvider::Fence> read_lock_fence;
+  if (use_sync_query_) {
+    // Block until oldest sync query has passed if the number of pending queries
+    // ever reach kMaxPendingSyncQueries.
+    if (pending_sync_queries_.size() >= kMaxPendingSyncQueries) {
+      LOG(ERROR) << "Reached limit of pending sync queries.";
+
+      pending_sync_queries_.front()->Wait();
+      DCHECK(!pending_sync_queries_.front()->IsPending());
+    }
+
+    while (!pending_sync_queries_.empty()) {
+      if (pending_sync_queries_.front()->IsPending())
+        break;
+
+      available_sync_queries_.push_back(pending_sync_queries_.take_front());
+    }
+
+    current_sync_query_ = available_sync_queries_.empty()
+                              ? make_scoped_ptr(new SyncQuery(gl_))
+                              : available_sync_queries_.take_front();
+
+    read_lock_fence = current_sync_query_->Begin();
+  } else {
+    read_lock_fence =
+        make_scoped_refptr(new ResourceProvider::SynchronousFence(gl_));
+  }
+  resource_provider_->SetReadLockFence(read_lock_fence.get());
+
+  // Insert WaitSyncPointCHROMIUM on quad resources prior to drawing the frame,
+  // so that drawing can proceed without GL context switching interruptions.
+  DrawQuad::ResourceIteratorCallback wait_on_resource_syncpoints_callback =
+      base::Bind(&WaitOnResourceSyncPoints, resource_provider_);
+
+  for (const auto& pass : *frame->render_passes_in_draw_order) {
+    for (const auto& quad : pass->quad_list)
+      quad->IterateResources(wait_on_resource_syncpoints_callback);
+  }
+
+  // TODO(enne): Do we need to reinitialize all of this state per frame?
+  ReinitializeGLState();
+}
+
+void GLRenderer::DoNoOp() {
+  GLC(gl_, gl_->BindFramebuffer(GL_FRAMEBUFFER, 0));
+  GLC(gl_, gl_->Flush());
+}
+
+void GLRenderer::DoDrawQuad(DrawingFrame* frame,
+                            const DrawQuad* quad,
+                            const gfx::QuadF* clip_region) {
+  DCHECK(quad->rect.Contains(quad->visible_rect));
+  if (quad->material != DrawQuad::TEXTURE_CONTENT) {
+    FlushTextureQuadCache(SHARED_BINDING);
+  }
+
+  switch (quad->material) {
+    case DrawQuad::INVALID:
+    case DrawQuad::UNUSED_SPACE_FOR_PICTURE_CONTENT:
+      NOTREACHED();
+      break;
+    case DrawQuad::CHECKERBOARD:
+      DrawCheckerboardQuad(frame, CheckerboardDrawQuad::MaterialCast(quad),
+                           clip_region);
+      break;
+    case DrawQuad::DEBUG_BORDER:
+      DrawDebugBorderQuad(frame, DebugBorderDrawQuad::MaterialCast(quad));
+      break;
+    case DrawQuad::IO_SURFACE_CONTENT:
+      DrawIOSurfaceQuad(frame, IOSurfaceDrawQuad::MaterialCast(quad),
+                        clip_region);
+      break;
+    case DrawQuad::RENDER_PASS:
+      DrawRenderPassQuad(frame, RenderPassDrawQuad::MaterialCast(quad),
+                         clip_region);
+      break;
+    case DrawQuad::SOLID_COLOR:
+      DrawSolidColorQuad(frame, SolidColorDrawQuad::MaterialCast(quad),
+                         clip_region);
+      break;
+    case DrawQuad::STREAM_VIDEO_CONTENT:
+      DrawStreamVideoQuad(frame, StreamVideoDrawQuad::MaterialCast(quad),
+                          clip_region);
+      break;
+    case DrawQuad::SURFACE_CONTENT:
+      // Surface content should be fully resolved to other quad types before
+      // reaching a direct renderer.
+      NOTREACHED();
+      break;
+    case DrawQuad::TEXTURE_CONTENT:
+      EnqueueTextureQuad(frame, TextureDrawQuad::MaterialCast(quad),
+                         clip_region);
+      break;
+    case DrawQuad::TILED_CONTENT:
+      DrawTileQuad(frame, TileDrawQuad::MaterialCast(quad), clip_region);
+      break;
+    case DrawQuad::YUV_VIDEO_CONTENT:
+      DrawYUVVideoQuad(frame, YUVVideoDrawQuad::MaterialCast(quad),
+                       clip_region);
+      break;
+  }
+}
+
+void GLRenderer::DrawCheckerboardQuad(const DrawingFrame* frame,
+                                      const CheckerboardDrawQuad* quad,
+                                      const gfx::QuadF* clip_region) {
+  // TODO(enne) For now since checkerboards shouldn't be part of a 3D
+  // context, clipping regions aren't supported so we skip drawing them
+  // if this becomes the case.
+  if (clip_region) {
+    return;
+  }
+  SetBlendEnabled(quad->ShouldDrawWithBlending());
+
+  const TileCheckerboardProgram* program = GetTileCheckerboardProgram();
+  DCHECK(program && (program->initialized() || IsContextLost()));
+  SetUseProgram(program->program());
+
+  SkColor color = quad->color;
+  GLC(gl_,
+      gl_->Uniform4f(program->fragment_shader().color_location(),
+                     SkColorGetR(color) * (1.0f / 255.0f),
+                     SkColorGetG(color) * (1.0f / 255.0f),
+                     SkColorGetB(color) * (1.0f / 255.0f),
+                     1));
+
+  const int kCheckerboardWidth = 16;
+  float frequency = 1.0f / kCheckerboardWidth;
+
+  gfx::Rect tile_rect = quad->rect;
+  float tex_offset_x =
+      static_cast<int>(tile_rect.x() / quad->scale) % kCheckerboardWidth;
+  float tex_offset_y =
+      static_cast<int>(tile_rect.y() / quad->scale) % kCheckerboardWidth;
+  float tex_scale_x = tile_rect.width() / quad->scale;
+  float tex_scale_y = tile_rect.height() / quad->scale;
+  GLC(gl_,
+      gl_->Uniform4f(program->fragment_shader().tex_transform_location(),
+                     tex_offset_x,
+                     tex_offset_y,
+                     tex_scale_x,
+                     tex_scale_y));
+
+  GLC(gl_,
+      gl_->Uniform1f(program->fragment_shader().frequency_location(),
+                     frequency));
+
+  SetShaderOpacity(quad->opacity(),
+                   program->fragment_shader().alpha_location());
+  DrawQuadGeometry(frame,
+                   quad->quadTransform(),
+                   quad->rect,
+                   program->vertex_shader().matrix_location());
+}
+
+// This function does not handle 3D sorting right now, since the debug border
+// quads are just drawn as their original quads and not in split pieces. This
+// results in some debug border quads drawing over foreground quads.
+void GLRenderer::DrawDebugBorderQuad(const DrawingFrame* frame,
+                                     const DebugBorderDrawQuad* quad) {
+  SetBlendEnabled(quad->ShouldDrawWithBlending());
+
+  static float gl_matrix[16];
+  const DebugBorderProgram* program = GetDebugBorderProgram();
+  DCHECK(program && (program->initialized() || IsContextLost()));
+  SetUseProgram(program->program());
+
+  // Use the full quad_rect for debug quads to not move the edges based on
+  // partial swaps.
+  gfx::Rect layer_rect = quad->rect;
+  gfx::Transform render_matrix;
+  QuadRectTransform(&render_matrix, quad->quadTransform(), layer_rect);
+  GLRenderer::ToGLMatrix(&gl_matrix[0],
+                         frame->projection_matrix * render_matrix);
+  GLC(gl_,
+      gl_->UniformMatrix4fv(
+          program->vertex_shader().matrix_location(), 1, false, &gl_matrix[0]));
+
+  SkColor color = quad->color;
+  float alpha = SkColorGetA(color) * (1.0f / 255.0f);
+
+  GLC(gl_,
+      gl_->Uniform4f(program->fragment_shader().color_location(),
+                     (SkColorGetR(color) * (1.0f / 255.0f)) * alpha,
+                     (SkColorGetG(color) * (1.0f / 255.0f)) * alpha,
+                     (SkColorGetB(color) * (1.0f / 255.0f)) * alpha,
+                     alpha));
+
+  GLC(gl_, gl_->LineWidth(quad->width));
+
+  // The indices for the line are stored in the same array as the triangle
+  // indices.
+  GLC(gl_, gl_->DrawElements(GL_LINE_LOOP, 4, GL_UNSIGNED_SHORT, 0));
+}
+
+bool GLRenderer::CanApplyBlendModeUsingBlendFunc(SkXfermode::Mode blend_mode) {
+  return use_blend_equation_advanced_ ||
+         blend_mode == SkXfermode::kScreen_Mode ||
+         blend_mode == SkXfermode::kSrcOver_Mode;
+}
+
+void GLRenderer::ApplyBlendModeUsingBlendFunc(SkXfermode::Mode blend_mode) {
+  DCHECK(CanApplyBlendModeUsingBlendFunc(blend_mode));
+
+  // Any modes set here must be reset in RestoreBlendFuncToDefault
+  if (use_blend_equation_advanced_) {
+    GLenum equation = GL_FUNC_ADD;
+
+    switch (blend_mode) {
+      case SkXfermode::kScreen_Mode:
+        equation = GL_SCREEN_KHR;
+        break;
+      case SkXfermode::kOverlay_Mode:
+        equation = GL_OVERLAY_KHR;
+        break;
+      case SkXfermode::kDarken_Mode:
+        equation = GL_DARKEN_KHR;
+        break;
+      case SkXfermode::kLighten_Mode:
+        equation = GL_LIGHTEN_KHR;
+        break;
+      case SkXfermode::kColorDodge_Mode:
+        equation = GL_COLORDODGE_KHR;
+        break;
+      case SkXfermode::kColorBurn_Mode:
+        equation = GL_COLORBURN_KHR;
+        break;
+      case SkXfermode::kHardLight_Mode:
+        equation = GL_HARDLIGHT_KHR;
+        break;
+      case SkXfermode::kSoftLight_Mode:
+        equation = GL_SOFTLIGHT_KHR;
+        break;
+      case SkXfermode::kDifference_Mode:
+        equation = GL_DIFFERENCE_KHR;
+        break;
+      case SkXfermode::kExclusion_Mode:
+        equation = GL_EXCLUSION_KHR;
+        break;
+      case SkXfermode::kMultiply_Mode:
+        equation = GL_MULTIPLY_KHR;
+        break;
+      case SkXfermode::kHue_Mode:
+        equation = GL_HSL_HUE_KHR;
+        break;
+      case SkXfermode::kSaturation_Mode:
+        equation = GL_HSL_SATURATION_KHR;
+        break;
+      case SkXfermode::kColor_Mode:
+        equation = GL_HSL_COLOR_KHR;
+        break;
+      case SkXfermode::kLuminosity_Mode:
+        equation = GL_HSL_LUMINOSITY_KHR;
+        break;
+      default:
+        return;
+    }
+
+    GLC(gl_, gl_->BlendEquation(equation));
+  } else {
+    if (blend_mode == SkXfermode::kScreen_Mode) {
+      GLC(gl_, gl_->BlendFunc(GL_ONE_MINUS_DST_COLOR, GL_ONE));
+    }
+  }
+}
+
+void GLRenderer::RestoreBlendFuncToDefault(SkXfermode::Mode blend_mode) {
+  if (blend_mode == SkXfermode::kSrcOver_Mode)
+    return;
+
+  if (use_blend_equation_advanced_) {
+    GLC(gl_, gl_->BlendEquation(GL_FUNC_ADD));
+  } else {
+    GLC(gl_, gl_->BlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA));
+  }
+}
+
+// This takes a gfx::Rect and a clip region quad in the same space,
+// and returns a quad with the same proportions in the space -0.5->0.5.
+bool GetScaledRegion(const gfx::Rect& rect,
+                     const gfx::QuadF* clip,
+                     gfx::QuadF* scaled_region) {
+  if (!clip)
+    return false;
+
+  gfx::PointF p1(((clip->p1().x() - rect.x()) / rect.width()) - 0.5f,
+                 ((clip->p1().y() - rect.y()) / rect.height()) - 0.5f);
+  gfx::PointF p2(((clip->p2().x() - rect.x()) / rect.width()) - 0.5f,
+                 ((clip->p2().y() - rect.y()) / rect.height()) - 0.5f);
+  gfx::PointF p3(((clip->p3().x() - rect.x()) / rect.width()) - 0.5f,
+                 ((clip->p3().y() - rect.y()) / rect.height()) - 0.5f);
+  gfx::PointF p4(((clip->p4().x() - rect.x()) / rect.width()) - 0.5f,
+                 ((clip->p4().y() - rect.y()) / rect.height()) - 0.5f);
+  *scaled_region = gfx::QuadF(p1, p2, p3, p4);
+  return true;
+}
+
+// This takes a gfx::Rect and a clip region quad in the same space,
+// and returns the proportional uv's in the space 0->1.
+bool GetScaledUVs(const gfx::Rect& rect, const gfx::QuadF* clip, float uvs[8]) {
+  if (!clip)
+    return false;
+
+  uvs[0] = ((clip->p1().x() - rect.x()) / rect.width());
+  uvs[1] = ((clip->p1().y() - rect.y()) / rect.height());
+  uvs[2] = ((clip->p2().x() - rect.x()) / rect.width());
+  uvs[3] = ((clip->p2().y() - rect.y()) / rect.height());
+  uvs[4] = ((clip->p3().x() - rect.x()) / rect.width());
+  uvs[5] = ((clip->p3().y() - rect.y()) / rect.height());
+  uvs[6] = ((clip->p4().x() - rect.x()) / rect.width());
+  uvs[7] = ((clip->p4().y() - rect.y()) / rect.height());
+  return true;
+}
+
+gfx::Rect GLRenderer::GetBackdropBoundingBoxForRenderPassQuad(
+    DrawingFrame* frame,
+    const RenderPassDrawQuad* quad,
+    const gfx::Transform& contents_device_transform,
+    const gfx::QuadF* clip_region,
+    bool use_aa) {
+  gfx::QuadF scaled_region;
+  if (!GetScaledRegion(quad->rect, clip_region, &scaled_region)) {
+    scaled_region = SharedGeometryQuad().BoundingBox();
+  }
+
+  gfx::Rect backdrop_rect = gfx::ToEnclosingRect(MathUtil::MapClippedRect(
+      contents_device_transform, scaled_region.BoundingBox()));
+
+  if (!backdrop_rect.IsEmpty() && use_aa) {
+    const int kOutsetForAntialiasing = 1;
+    backdrop_rect.Inset(-kOutsetForAntialiasing, -kOutsetForAntialiasing);
+  }
+
+  backdrop_rect.Intersect(MoveFromDrawToWindowSpace(
+      frame, frame->current_render_pass->output_rect));
+  return backdrop_rect;
+}
+
+scoped_ptr<ScopedResource> GLRenderer::GetBackdropTexture(
+    const gfx::Rect& bounding_rect) {
+  scoped_ptr<ScopedResource> device_background_texture =
+      ScopedResource::Create(resource_provider_);
+  // CopyTexImage2D fails when called on a texture having immutable storage.
+  device_background_texture->Allocate(
+      bounding_rect.size(), ResourceProvider::TEXTURE_HINT_DEFAULT, RGBA_8888);
+  {
+    ResourceProvider::ScopedWriteLockGL lock(resource_provider_,
+                                             device_background_texture->id());
+    GetFramebufferTexture(
+        lock.texture_id(), device_background_texture->format(), bounding_rect);
+  }
+  return device_background_texture.Pass();
+}
+
+void GLRenderer::DrawRenderPassQuad(DrawingFrame* frame,
+                                    const RenderPassDrawQuad* quad,
+                                    const gfx::QuadF* clip_region) {
+  ScopedResource* contents_texture =
+      render_pass_textures_.get(quad->render_pass_id);
+  if (!contents_texture || !contents_texture->id())
+    return;
+
+  gfx::Transform quad_rect_matrix;
+  QuadRectTransform(&quad_rect_matrix, quad->quadTransform(), quad->rect);
+  gfx::Transform contents_device_transform =
+      frame->window_matrix * frame->projection_matrix * quad_rect_matrix;
+  contents_device_transform.FlattenTo2d();
+
+  // Can only draw surface if device matrix is invertible.
+  if (!contents_device_transform.IsInvertible())
+    return;
+
+  gfx::QuadF surface_quad = SharedGeometryQuad();
+  float edge[24];
+  bool use_aa = settings_->allow_antialiasing &&
+                ShouldAntialiasQuad(contents_device_transform, quad,
+                                    settings_->force_antialiasing);
+
+  SetupQuadForClippingAndAntialiasing(contents_device_transform, quad, use_aa,
+                                      clip_region, &surface_quad, edge);
+  SkXfermode::Mode blend_mode = quad->shared_quad_state->blend_mode;
+  bool use_shaders_for_blending =
+      !CanApplyBlendModeUsingBlendFunc(blend_mode) ||
+      settings_->force_blending_with_shaders;
+
+  scoped_ptr<ScopedResource> background_texture;
+  skia::RefPtr<SkImage> background_image;
+  gfx::Rect background_rect;
+  if (use_shaders_for_blending) {
+    // Compute a bounding box around the pixels that will be visible through
+    // the quad.
+    background_rect = GetBackdropBoundingBoxForRenderPassQuad(
+        frame, quad, contents_device_transform, clip_region, use_aa);
+
+    if (!background_rect.IsEmpty()) {
+      // The pixels from the filtered background should completely replace the
+      // current pixel values.
+      if (blend_enabled())
+        SetBlendEnabled(false);
+
+      // Read the pixels in the bounding box into a buffer R.
+      // This function allocates a texture, which should contribute to the
+      // amount of memory used by render surfaces:
+      // LayerTreeHost::CalculateMemoryForRenderSurfaces.
+      background_texture = GetBackdropTexture(background_rect);
+    }
+
+    if (!background_texture) {
+      // Something went wrong with reading the backdrop.
+      DCHECK(!background_image);
+      use_shaders_for_blending = false;
+    } else if (background_image) {
+      // Reset original background texture if there is not any mask
+      if (!quad->mask_resource_id)
+        background_texture.reset();
+    }
+  }
+  // Need original background texture for mask?
+  bool mask_for_background =
+      background_texture &&    // Have original background texture
+      background_image &&      // Have filtered background texture
+      quad->mask_resource_id;  // Have mask texture
+  SetBlendEnabled(
+      !use_shaders_for_blending &&
+      (quad->ShouldDrawWithBlending() || !IsDefaultBlendMode(blend_mode)));
+
+  // TODO(senorblanco): Cache this value so that we don't have to do it for both
+  // the surface and its replica.  Apply filters to the contents texture.
+  skia::RefPtr<SkImage> filter_image;
+  SkScalar color_matrix[20];
+  bool use_color_matrix = false;
+  DCHECK(quad->filters.IsEmpty());
+
+  scoped_ptr<ResourceProvider::ScopedSamplerGL> mask_resource_lock;
+  unsigned mask_texture_id = 0;
+  SamplerType mask_sampler = SAMPLER_TYPE_NA;
+  if (quad->mask_resource_id) {
+    mask_resource_lock.reset(new ResourceProvider::ScopedSamplerGL(
+        resource_provider_, quad->mask_resource_id, GL_TEXTURE1, GL_LINEAR));
+    mask_texture_id = mask_resource_lock->texture_id();
+    mask_sampler = SamplerTypeFromTextureTarget(mask_resource_lock->target());
+  }
+
+  scoped_ptr<ResourceProvider::ScopedSamplerGL> contents_resource_lock;
+  if (filter_image) {
+    GrTexture* texture = filter_image->getTexture();
+    DCHECK_EQ(GL_TEXTURE0, GetActiveTextureUnit(gl_));
+    gl_->BindTexture(GL_TEXTURE_2D, texture->getTextureHandle());
+  } else {
+    contents_resource_lock =
+        make_scoped_ptr(new ResourceProvider::ScopedSamplerGL(
+            resource_provider_, contents_texture->id(), GL_LINEAR));
+    DCHECK_EQ(static_cast<GLenum>(GL_TEXTURE_2D),
+              contents_resource_lock->target());
+  }
+
+  if (!use_shaders_for_blending) {
+    if (!use_blend_equation_advanced_coherent_ && use_blend_equation_advanced_)
+      GLC(gl_, gl_->BlendBarrierKHR());
+
+    ApplyBlendModeUsingBlendFunc(blend_mode);
+  }
+
+  TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
+      gl_,
+      &highp_threshold_cache_,
+      highp_threshold_min_,
+      quad->shared_quad_state->visible_content_rect.bottom_right());
+
+  ShaderLocations locations;
+
+  DCHECK_EQ(background_texture || background_image, use_shaders_for_blending);
+  BlendMode shader_blend_mode = use_shaders_for_blending
+                                    ? BlendModeFromSkXfermode(blend_mode)
+                                    : BLEND_MODE_NONE;
+
+  if (use_aa && mask_texture_id && !use_color_matrix) {
+    const RenderPassMaskProgramAA* program = GetRenderPassMaskProgramAA(
+        tex_coord_precision, mask_sampler,
+        shader_blend_mode, mask_for_background);
+    SetUseProgram(program->program());
+    program->vertex_shader().FillLocations(&locations);
+    program->fragment_shader().FillLocations(&locations);
+    GLC(gl_, gl_->Uniform1i(locations.sampler, 0));
+  } else if (!use_aa && mask_texture_id && !use_color_matrix) {
+    const RenderPassMaskProgram* program = GetRenderPassMaskProgram(
+        tex_coord_precision, mask_sampler,
+        shader_blend_mode, mask_for_background);
+    SetUseProgram(program->program());
+    program->vertex_shader().FillLocations(&locations);
+    program->fragment_shader().FillLocations(&locations);
+    GLC(gl_, gl_->Uniform1i(locations.sampler, 0));
+  } else if (use_aa && !mask_texture_id && !use_color_matrix) {
+    const RenderPassProgramAA* program =
+        GetRenderPassProgramAA(tex_coord_precision, shader_blend_mode);
+    SetUseProgram(program->program());
+    program->vertex_shader().FillLocations(&locations);
+    program->fragment_shader().FillLocations(&locations);
+    GLC(gl_, gl_->Uniform1i(locations.sampler, 0));
+  } else if (use_aa && mask_texture_id && use_color_matrix) {
+    const RenderPassMaskColorMatrixProgramAA* program =
+        GetRenderPassMaskColorMatrixProgramAA(
+            tex_coord_precision, mask_sampler,
+            shader_blend_mode, mask_for_background);
+    SetUseProgram(program->program());
+    program->vertex_shader().FillLocations(&locations);
+    program->fragment_shader().FillLocations(&locations);
+    GLC(gl_, gl_->Uniform1i(locations.sampler, 0));
+  } else if (use_aa && !mask_texture_id && use_color_matrix) {
+    const RenderPassColorMatrixProgramAA* program =
+        GetRenderPassColorMatrixProgramAA(tex_coord_precision,
+                                          shader_blend_mode);
+    SetUseProgram(program->program());
+    program->vertex_shader().FillLocations(&locations);
+    program->fragment_shader().FillLocations(&locations);
+    GLC(gl_, gl_->Uniform1i(locations.sampler, 0));
+  } else if (!use_aa && mask_texture_id && use_color_matrix) {
+    const RenderPassMaskColorMatrixProgram* program =
+        GetRenderPassMaskColorMatrixProgram(
+            tex_coord_precision, mask_sampler,
+            shader_blend_mode, mask_for_background);
+    SetUseProgram(program->program());
+    program->vertex_shader().FillLocations(&locations);
+    program->fragment_shader().FillLocations(&locations);
+    GLC(gl_, gl_->Uniform1i(locations.sampler, 0));
+  } else if (!use_aa && !mask_texture_id && use_color_matrix) {
+    const RenderPassColorMatrixProgram* program =
+        GetRenderPassColorMatrixProgram(tex_coord_precision, shader_blend_mode);
+    SetUseProgram(program->program());
+    program->vertex_shader().FillLocations(&locations);
+    program->fragment_shader().FillLocations(&locations);
+    GLC(gl_, gl_->Uniform1i(locations.sampler, 0));
+  } else {
+    const RenderPassProgram* program =
+        GetRenderPassProgram(tex_coord_precision, shader_blend_mode);
+    SetUseProgram(program->program());
+    program->vertex_shader().FillLocations(&locations);
+    program->fragment_shader().FillLocations(&locations);
+    GLC(gl_, gl_->Uniform1i(locations.sampler, 0));
+  }
+  float tex_scale_x =
+      quad->rect.width() / static_cast<float>(contents_texture->size().width());
+  float tex_scale_y = quad->rect.height() /
+                      static_cast<float>(contents_texture->size().height());
+  DCHECK_LE(tex_scale_x, 1.0f);
+  DCHECK_LE(tex_scale_y, 1.0f);
+
+  DCHECK(locations.tex_transform != -1 || IsContextLost());
+  // Flip the content vertically in the shader, as the RenderPass input
+  // texture is already oriented the same way as the framebuffer, but the
+  // projection transform does a flip.
+  GLC(gl_,
+      gl_->Uniform4f(locations.tex_transform,
+                     0.0f,
+                     tex_scale_y,
+                     tex_scale_x,
+                     -tex_scale_y));
+
+  GLint last_texture_unit = 0;
+  if (locations.mask_sampler != -1) {
+    DCHECK_NE(locations.mask_tex_coord_scale, 1);
+    DCHECK_NE(locations.mask_tex_coord_offset, 1);
+    GLC(gl_, gl_->Uniform1i(locations.mask_sampler, 1));
+
+    gfx::RectF mask_uv_rect = quad->MaskUVRect();
+    if (mask_sampler != SAMPLER_TYPE_2D) {
+      mask_uv_rect.Scale(quad->mask_texture_size.width(),
+                         quad->mask_texture_size.height());
+    }
+
+    // Mask textures are oriented vertically flipped relative to the framebuffer
+    // and the RenderPass contents texture, so we flip the tex coords from the
+    // RenderPass texture to find the mask texture coords.
+    GLC(gl_,
+        gl_->Uniform2f(locations.mask_tex_coord_offset,
+                       mask_uv_rect.x(),
+                       mask_uv_rect.bottom()));
+    GLC(gl_,
+        gl_->Uniform2f(locations.mask_tex_coord_scale,
+                       mask_uv_rect.width() / tex_scale_x,
+                       -mask_uv_rect.height() / tex_scale_y));
+
+    last_texture_unit = 1;
+  }
+
+  if (locations.edge != -1)
+    GLC(gl_, gl_->Uniform3fv(locations.edge, 8, edge));
+
+  if (locations.viewport != -1) {
+    float viewport[4] = {static_cast<float>(viewport_.x()),
+                         static_cast<float>(viewport_.y()),
+                         static_cast<float>(viewport_.width()),
+                         static_cast<float>(viewport_.height()), };
+    GLC(gl_, gl_->Uniform4fv(locations.viewport, 1, viewport));
+  }
+
+  if (locations.color_matrix != -1) {
+    float matrix[16];
+    for (int i = 0; i < 4; ++i) {
+      for (int j = 0; j < 4; ++j)
+        matrix[i * 4 + j] = SkScalarToFloat(color_matrix[j * 5 + i]);
+    }
+    GLC(gl_,
+        gl_->UniformMatrix4fv(locations.color_matrix, 1, false, matrix));
+  }
+  static const float kScale = 1.0f / 255.0f;
+  if (locations.color_offset != -1) {
+    float offset[4];
+    for (int i = 0; i < 4; ++i)
+      offset[i] = SkScalarToFloat(color_matrix[i * 5 + 4]) * kScale;
+
+    GLC(gl_, gl_->Uniform4fv(locations.color_offset, 1, offset));
+  }
+
+  scoped_ptr<ResourceProvider::ScopedSamplerGL> shader_background_sampler_lock;
+  if (locations.backdrop != -1) {
+    DCHECK(background_texture || background_image);
+    DCHECK_NE(locations.backdrop, 0);
+    DCHECK_NE(locations.backdrop_rect, 0);
+
+    GLC(gl_, gl_->Uniform1i(locations.backdrop, ++last_texture_unit));
+
+    GLC(gl_,
+        gl_->Uniform4f(locations.backdrop_rect,
+                       background_rect.x(),
+                       background_rect.y(),
+                       background_rect.width(),
+                       background_rect.height()));
+
+    if (background_image) {
+      GrTexture* texture = background_image->getTexture();
+      GLC(gl_, gl_->ActiveTexture(GL_TEXTURE0 + last_texture_unit));
+      gl_->BindTexture(GL_TEXTURE_2D, texture->getTextureHandle());
+      GLC(gl_, gl_->ActiveTexture(GL_TEXTURE0));
+      if (mask_for_background)
+        GLC(gl_, gl_->Uniform1i(locations.original_backdrop,
+                                ++last_texture_unit));
+    }
+    if (background_texture) {
+      shader_background_sampler_lock = make_scoped_ptr(
+          new ResourceProvider::ScopedSamplerGL(resource_provider_,
+                                                background_texture->id(),
+                                                GL_TEXTURE0 + last_texture_unit,
+                                                GL_LINEAR));
+      DCHECK_EQ(static_cast<GLenum>(GL_TEXTURE_2D),
+                shader_background_sampler_lock->target());
+    }
+  }
+
+  SetShaderOpacity(quad->opacity(), locations.alpha);
+  SetShaderQuadF(surface_quad, locations.quad);
+  DrawQuadGeometry(
+      frame, quad->quadTransform(), quad->rect, locations.matrix);
+
+  // Flush the compositor context before the filter bitmap goes out of
+  // scope, so the draw gets processed before the filter texture gets deleted.
+  if (filter_image)
+    GLC(gl_, gl_->Flush());
+
+  if (!use_shaders_for_blending)
+    RestoreBlendFuncToDefault(blend_mode);
+}
+
+struct SolidColorProgramUniforms {
+  unsigned program;
+  unsigned matrix_location;
+  unsigned viewport_location;
+  unsigned quad_location;
+  unsigned edge_location;
+  unsigned color_location;
+};
+
+template <class T>
+static void SolidColorUniformLocation(T program,
+                                      SolidColorProgramUniforms* uniforms) {
+  uniforms->program = program->program();
+  uniforms->matrix_location = program->vertex_shader().matrix_location();
+  uniforms->viewport_location = program->vertex_shader().viewport_location();
+  uniforms->quad_location = program->vertex_shader().quad_location();
+  uniforms->edge_location = program->vertex_shader().edge_location();
+  uniforms->color_location = program->fragment_shader().color_location();
+}
+
+namespace {
+// These functions determine if a quad, clipped by a clip_region contains
+// the entire {top|bottom|left|right} edge.
+bool is_top(const gfx::QuadF* clip_region, const DrawQuad* quad) {
+  if (!quad->IsTopEdge())
+    return false;
+  if (!clip_region)
+    return true;
+
+  return std::abs(clip_region->p1().y()) < kAntiAliasingEpsilon &&
+         std::abs(clip_region->p2().y()) < kAntiAliasingEpsilon;
+}
+
+bool is_bottom(const gfx::QuadF* clip_region, const DrawQuad* quad) {
+  if (!quad->IsBottomEdge())
+    return false;
+  if (!clip_region)
+    return true;
+
+  return std::abs(clip_region->p3().y() -
+                  quad->shared_quad_state->content_bounds.height()) <
+             kAntiAliasingEpsilon &&
+         std::abs(clip_region->p4().y() -
+                  quad->shared_quad_state->content_bounds.height()) <
+             kAntiAliasingEpsilon;
+}
+
+bool is_left(const gfx::QuadF* clip_region, const DrawQuad* quad) {
+  if (!quad->IsLeftEdge())
+    return false;
+  if (!clip_region)
+    return true;
+
+  return std::abs(clip_region->p1().x()) < kAntiAliasingEpsilon &&
+         std::abs(clip_region->p4().x()) < kAntiAliasingEpsilon;
+}
+
+bool is_right(const gfx::QuadF* clip_region, const DrawQuad* quad) {
+  if (!quad->IsRightEdge())
+    return false;
+  if (!clip_region)
+    return true;
+
+  return std::abs(clip_region->p2().x() -
+                  quad->shared_quad_state->content_bounds.width()) <
+             kAntiAliasingEpsilon &&
+         std::abs(clip_region->p3().x() -
+                  quad->shared_quad_state->content_bounds.width()) <
+             kAntiAliasingEpsilon;
+}
+}  // anonymous namespace
+
+static gfx::QuadF GetDeviceQuadWithAntialiasingOnExteriorEdges(
+    const LayerQuad& device_layer_edges,
+    const gfx::Transform& device_transform,
+    const gfx::QuadF* clip_region,
+    const DrawQuad* quad) {
+  gfx::RectF tile_rect = quad->visible_rect;
+  gfx::QuadF tile_quad(tile_rect);
+
+  if (clip_region) {
+    if (quad->material != DrawQuad::RENDER_PASS) {
+      tile_quad = *clip_region;
+    } else {
+      GetScaledRegion(quad->rect, clip_region, &tile_quad);
+    }
+  }
+
+  gfx::PointF bottom_right = tile_quad.p3();
+  gfx::PointF bottom_left = tile_quad.p4();
+  gfx::PointF top_left = tile_quad.p1();
+  gfx::PointF top_right = tile_quad.p2();
+  bool clipped = false;
+
+  // Map points to device space. We ignore |clipped|, since the result of
+  // |MapPoint()| still produces a valid point to draw the quad with. When
+  // clipped, the point will be outside of the viewport. See crbug.com/416367.
+  bottom_right = MathUtil::MapPoint(device_transform, bottom_right, &clipped);
+  bottom_left = MathUtil::MapPoint(device_transform, bottom_left, &clipped);
+  top_left = MathUtil::MapPoint(device_transform, top_left, &clipped);
+  top_right = MathUtil::MapPoint(device_transform, top_right, &clipped);
+
+  LayerQuad::Edge bottom_edge(bottom_right, bottom_left);
+  LayerQuad::Edge left_edge(bottom_left, top_left);
+  LayerQuad::Edge top_edge(top_left, top_right);
+  LayerQuad::Edge right_edge(top_right, bottom_right);
+
+  // Only apply anti-aliasing to edges not clipped by culling or scissoring.
+  // If an edge is degenerate we do not want to replace it with a "proper" edge
+  // as that will cause the quad to possibly expand is strange ways.
+  if (!top_edge.degenerate() && is_top(clip_region, quad) &&
+      tile_rect.y() == quad->rect.y()) {
+    top_edge = device_layer_edges.top();
+  }
+  if (!left_edge.degenerate() && is_left(clip_region, quad) &&
+      tile_rect.x() == quad->rect.x()) {
+    left_edge = device_layer_edges.left();
+  }
+  if (!right_edge.degenerate() && is_right(clip_region, quad) &&
+      tile_rect.right() == quad->rect.right()) {
+    right_edge = device_layer_edges.right();
+  }
+  if (!bottom_edge.degenerate() && is_bottom(clip_region, quad) &&
+      tile_rect.bottom() == quad->rect.bottom()) {
+    bottom_edge = device_layer_edges.bottom();
+  }
+
+  float sign = tile_quad.IsCounterClockwise() ? -1 : 1;
+  bottom_edge.scale(sign);
+  left_edge.scale(sign);
+  top_edge.scale(sign);
+  right_edge.scale(sign);
+
+  // Create device space quad.
+  return LayerQuad(left_edge, top_edge, right_edge, bottom_edge).ToQuadF();
+}
+
+float GetTotalQuadError(const gfx::QuadF* clipped_quad,
+                        const gfx::QuadF* ideal_rect) {
+  return (clipped_quad->p1() - ideal_rect->p1()).LengthSquared() +
+         (clipped_quad->p2() - ideal_rect->p2()).LengthSquared() +
+         (clipped_quad->p3() - ideal_rect->p3()).LengthSquared() +
+         (clipped_quad->p4() - ideal_rect->p4()).LengthSquared();
+}
+
+// Attempt to rotate the clipped quad until it lines up the most
+// correctly. This is necessary because we check the edges of this
+// quad against the expected left/right/top/bottom for anti-aliasing.
+void AlignQuadToBoundingBox(gfx::QuadF* clipped_quad) {
+  gfx::QuadF bounding_quad = gfx::QuadF(clipped_quad->BoundingBox());
+  gfx::QuadF best_rotation = *clipped_quad;
+  float least_error_amount = GetTotalQuadError(clipped_quad, &bounding_quad);
+  for (size_t i = 1; i < 4; ++i) {
+    clipped_quad->Realign(1);
+    float new_error = GetTotalQuadError(clipped_quad, &bounding_quad);
+    if (new_error < least_error_amount) {
+      least_error_amount = new_error;
+      best_rotation = *clipped_quad;
+    }
+  }
+  *clipped_quad = best_rotation;
+}
+
+// static
+bool GLRenderer::ShouldAntialiasQuad(const gfx::Transform& device_transform,
+                                     const DrawQuad* quad,
+                                     bool force_antialiasing) {
+  bool is_render_pass_quad = (quad->material == DrawQuad::RENDER_PASS);
+  // For render pass quads, |device_transform| already contains quad's rect.
+  // TODO(rosca@adobe.com): remove branching on is_render_pass_quad
+  // crbug.com/429702
+  if (!is_render_pass_quad && !quad->IsEdge())
+    return false;
+  gfx::RectF content_rect =
+      is_render_pass_quad ? QuadVertexRect() : quad->visibleContentRect();
+
+  bool clipped = false;
+  gfx::QuadF device_layer_quad =
+      MathUtil::MapQuad(device_transform, gfx::QuadF(content_rect), &clipped);
+
+  if (device_layer_quad.BoundingBox().IsEmpty())
+    return false;
+
+  bool is_axis_aligned_in_target = device_layer_quad.IsRectilinear();
+  bool is_nearest_rect_within_epsilon =
+      is_axis_aligned_in_target &&
+      gfx::IsNearestRectWithinDistance(device_layer_quad.BoundingBox(),
+                                       kAntiAliasingEpsilon);
+  // AAing clipped quads is not supported by the code yet.
+  bool use_aa = !clipped && !is_nearest_rect_within_epsilon;
+  return use_aa || force_antialiasing;
+}
+
+// static
+void GLRenderer::SetupQuadForClippingAndAntialiasing(
+    const gfx::Transform& device_transform,
+    const DrawQuad* quad,
+    bool use_aa,
+    const gfx::QuadF* clip_region,
+    gfx::QuadF* local_quad,
+    float edge[24]) {
+  bool is_render_pass_quad = (quad->material == DrawQuad::RENDER_PASS);
+  gfx::QuadF rotated_clip;
+  const gfx::QuadF* local_clip_region = clip_region;
+  if (local_clip_region) {
+    rotated_clip = *clip_region;
+    AlignQuadToBoundingBox(&rotated_clip);
+    local_clip_region = &rotated_clip;
+  }
+
+  gfx::QuadF content_rect = is_render_pass_quad
+                                ? gfx::QuadF(QuadVertexRect())
+                                : gfx::QuadF(quad->visibleContentRect());
+  if (!use_aa) {
+    if (local_clip_region) {
+      if (!is_render_pass_quad) {
+        content_rect = *local_clip_region;
+      } else {
+        GetScaledRegion(quad->rect, local_clip_region, &content_rect);
+      }
+      *local_quad = content_rect;
+    }
+    return;
+  }
+  bool clipped = false;
+  gfx::QuadF device_layer_quad =
+      MathUtil::MapQuad(device_transform, content_rect, &clipped);
+
+  LayerQuad device_layer_bounds(gfx::QuadF(device_layer_quad.BoundingBox()));
+  device_layer_bounds.InflateAntiAliasingDistance();
+
+  LayerQuad device_layer_edges(device_layer_quad);
+  device_layer_edges.InflateAntiAliasingDistance();
+
+  device_layer_edges.ToFloatArray(edge);
+  device_layer_bounds.ToFloatArray(&edge[12]);
+
+  // If we have a clip region then we are split, and therefore
+  // by necessity, at least one of our edges is not an external
+  // one.
+  bool is_full_rect = quad->visible_rect == quad->rect;
+
+  bool region_contains_all_outside_edges =
+      is_full_rect &&
+      (is_top(local_clip_region, quad) && is_left(local_clip_region, quad) &&
+       is_bottom(local_clip_region, quad) && is_right(local_clip_region, quad));
+
+  bool use_aa_on_all_four_edges =
+      !local_clip_region &&
+      (is_render_pass_quad || region_contains_all_outside_edges);
+
+  gfx::QuadF device_quad =
+      use_aa_on_all_four_edges
+          ? device_layer_edges.ToQuadF()
+          : GetDeviceQuadWithAntialiasingOnExteriorEdges(
+                device_layer_edges, device_transform, local_clip_region, quad);
+
+  // Map device space quad to local space. device_transform has no 3d
+  // component since it was flattened, so we don't need to project.  We should
+  // have already checked that the transform was uninvertible above.
+  gfx::Transform inverse_device_transform(gfx::Transform::kSkipInitialization);
+  bool did_invert = device_transform.GetInverse(&inverse_device_transform);
+  DCHECK(did_invert);
+  *local_quad =
+      MathUtil::MapQuad(inverse_device_transform, device_quad, &clipped);
+  // We should not DCHECK(!clipped) here, because anti-aliasing inflation may
+  // cause device_quad to become clipped. To our knowledge this scenario does
+  // not need to be handled differently than the unclipped case.
+}
+
+void GLRenderer::DrawSolidColorQuad(const DrawingFrame* frame,
+                                    const SolidColorDrawQuad* quad,
+                                    const gfx::QuadF* clip_region) {
+  gfx::Rect tile_rect = quad->visible_rect;
+
+  SkColor color = quad->color;
+  float opacity = quad->opacity();
+  float alpha = (SkColorGetA(color) * (1.0f / 255.0f)) * opacity;
+
+  // Early out if alpha is small enough that quad doesn't contribute to output.
+  if (alpha < std::numeric_limits<float>::epsilon() &&
+      quad->ShouldDrawWithBlending())
+    return;
+
+  gfx::Transform device_transform =
+      frame->window_matrix * frame->projection_matrix * quad->quadTransform();
+  device_transform.FlattenTo2d();
+  if (!device_transform.IsInvertible())
+    return;
+
+  bool force_aa = false;
+  gfx::QuadF local_quad = gfx::QuadF(gfx::RectF(tile_rect));
+  float edge[24];
+  bool use_aa = settings_->allow_antialiasing &&
+                !quad->force_anti_aliasing_off &&
+                ShouldAntialiasQuad(device_transform, quad, force_aa);
+  SetupQuadForClippingAndAntialiasing(device_transform, quad, use_aa,
+                                      clip_region, &local_quad, edge);
+
+  SolidColorProgramUniforms uniforms;
+  if (use_aa) {
+    SolidColorUniformLocation(GetSolidColorProgramAA(), &uniforms);
+  } else {
+    SolidColorUniformLocation(GetSolidColorProgram(), &uniforms);
+  }
+  SetUseProgram(uniforms.program);
+
+  GLC(gl_,
+      gl_->Uniform4f(uniforms.color_location,
+                     (SkColorGetR(color) * (1.0f / 255.0f)) * alpha,
+                     (SkColorGetG(color) * (1.0f / 255.0f)) * alpha,
+                     (SkColorGetB(color) * (1.0f / 255.0f)) * alpha,
+                     alpha));
+  if (use_aa) {
+    float viewport[4] = {static_cast<float>(viewport_.x()),
+                         static_cast<float>(viewport_.y()),
+                         static_cast<float>(viewport_.width()),
+                         static_cast<float>(viewport_.height()), };
+    GLC(gl_, gl_->Uniform4fv(uniforms.viewport_location, 1, viewport));
+    GLC(gl_, gl_->Uniform3fv(uniforms.edge_location, 8, edge));
+  }
+
+  // Enable blending when the quad properties require it or if we decided
+  // to use antialiasing.
+  SetBlendEnabled(quad->ShouldDrawWithBlending() || use_aa);
+
+  // Normalize to tile_rect.
+  local_quad.Scale(1.0f / tile_rect.width(), 1.0f / tile_rect.height());
+
+  SetShaderQuadF(local_quad, uniforms.quad_location);
+
+  // The transform and vertex data are used to figure out the extents that the
+  // un-antialiased quad should have and which vertex this is and the float
+  // quad passed in via uniform is the actual geometry that gets used to draw
+  // it. This is why this centered rect is used and not the original quad_rect.
+  gfx::RectF centered_rect(
+      gfx::PointF(-0.5f * tile_rect.width(), -0.5f * tile_rect.height()),
+      tile_rect.size());
+  DrawQuadGeometry(
+      frame, quad->quadTransform(), centered_rect, uniforms.matrix_location);
+}
+
+struct TileProgramUniforms {
+  unsigned program;
+  unsigned matrix_location;
+  unsigned viewport_location;
+  unsigned quad_location;
+  unsigned edge_location;
+  unsigned vertex_tex_transform_location;
+  unsigned sampler_location;
+  unsigned fragment_tex_transform_location;
+  unsigned alpha_location;
+};
+
+template <class T>
+static void TileUniformLocation(T program, TileProgramUniforms* uniforms) {
+  uniforms->program = program->program();
+  uniforms->matrix_location = program->vertex_shader().matrix_location();
+  uniforms->viewport_location = program->vertex_shader().viewport_location();
+  uniforms->quad_location = program->vertex_shader().quad_location();
+  uniforms->edge_location = program->vertex_shader().edge_location();
+  uniforms->vertex_tex_transform_location =
+      program->vertex_shader().vertex_tex_transform_location();
+
+  uniforms->sampler_location = program->fragment_shader().sampler_location();
+  uniforms->alpha_location = program->fragment_shader().alpha_location();
+  uniforms->fragment_tex_transform_location =
+      program->fragment_shader().fragment_tex_transform_location();
+}
+
+void GLRenderer::DrawTileQuad(const DrawingFrame* frame,
+                              const TileDrawQuad* quad,
+                              const gfx::QuadF* clip_region) {
+  DrawContentQuad(frame, quad, quad->resource_id, clip_region);
+}
+
+void GLRenderer::DrawContentQuad(const DrawingFrame* frame,
+                                 const ContentDrawQuadBase* quad,
+                                 ResourceProvider::ResourceId resource_id,
+                                 const gfx::QuadF* clip_region) {
+  gfx::Transform device_transform =
+      frame->window_matrix * frame->projection_matrix * quad->quadTransform();
+  device_transform.FlattenTo2d();
+
+  bool use_aa = settings_->allow_antialiasing &&
+                ShouldAntialiasQuad(device_transform, quad, false);
+
+  // TODO(timav): simplify coordinate transformations in DrawContentQuadAA
+  // similar to the way DrawContentQuadNoAA works and then consider
+  // combining DrawContentQuadAA and DrawContentQuadNoAA into one method.
+  if (use_aa)
+    DrawContentQuadAA(frame, quad, resource_id, device_transform, clip_region);
+  else
+    DrawContentQuadNoAA(frame, quad, resource_id, clip_region);
+}
+
+void GLRenderer::DrawContentQuadAA(const DrawingFrame* frame,
+                                   const ContentDrawQuadBase* quad,
+                                   ResourceProvider::ResourceId resource_id,
+                                   const gfx::Transform& device_transform,
+                                   const gfx::QuadF* clip_region) {
+  if (!device_transform.IsInvertible())
+    return;
+
+  gfx::Rect tile_rect = quad->visible_rect;
+
+  gfx::RectF tex_coord_rect = MathUtil::ScaleRectProportional(
+      quad->tex_coord_rect, quad->rect, tile_rect);
+  float tex_to_geom_scale_x = quad->rect.width() / quad->tex_coord_rect.width();
+  float tex_to_geom_scale_y =
+      quad->rect.height() / quad->tex_coord_rect.height();
+
+  gfx::RectF clamp_geom_rect(tile_rect);
+  gfx::RectF clamp_tex_rect(tex_coord_rect);
+  // Clamp texture coordinates to avoid sampling outside the layer
+  // by deflating the tile region half a texel or half a texel
+  // minus epsilon for one pixel layers. The resulting clamp region
+  // is mapped to the unit square by the vertex shader and mapped
+  // back to normalized texture coordinates by the fragment shader
+  // after being clamped to 0-1 range.
+  float tex_clamp_x =
+      std::min(0.5f, 0.5f * clamp_tex_rect.width() - kAntiAliasingEpsilon);
+  float tex_clamp_y =
+      std::min(0.5f, 0.5f * clamp_tex_rect.height() - kAntiAliasingEpsilon);
+  float geom_clamp_x =
+      std::min(tex_clamp_x * tex_to_geom_scale_x,
+               0.5f * clamp_geom_rect.width() - kAntiAliasingEpsilon);
+  float geom_clamp_y =
+      std::min(tex_clamp_y * tex_to_geom_scale_y,
+               0.5f * clamp_geom_rect.height() - kAntiAliasingEpsilon);
+  clamp_geom_rect.Inset(geom_clamp_x, geom_clamp_y, geom_clamp_x, geom_clamp_y);
+  clamp_tex_rect.Inset(tex_clamp_x, tex_clamp_y, tex_clamp_x, tex_clamp_y);
+
+  // Map clamping rectangle to unit square.
+  float vertex_tex_translate_x = -clamp_geom_rect.x() / clamp_geom_rect.width();
+  float vertex_tex_translate_y =
+      -clamp_geom_rect.y() / clamp_geom_rect.height();
+  float vertex_tex_scale_x = tile_rect.width() / clamp_geom_rect.width();
+  float vertex_tex_scale_y = tile_rect.height() / clamp_geom_rect.height();
+
+  TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
+      gl_, &highp_threshold_cache_, highp_threshold_min_, quad->texture_size);
+
+  gfx::QuadF local_quad = gfx::QuadF(gfx::RectF(tile_rect));
+  float edge[24];
+  SetupQuadForClippingAndAntialiasing(device_transform, quad, true, clip_region,
+                                      &local_quad, edge);
+  ResourceProvider::ScopedSamplerGL quad_resource_lock(
+      resource_provider_, resource_id,
+      quad->nearest_neighbor ? GL_NEAREST : GL_LINEAR);
+  SamplerType sampler =
+      SamplerTypeFromTextureTarget(quad_resource_lock.target());
+
+  float fragment_tex_translate_x = clamp_tex_rect.x();
+  float fragment_tex_translate_y = clamp_tex_rect.y();
+  float fragment_tex_scale_x = clamp_tex_rect.width();
+  float fragment_tex_scale_y = clamp_tex_rect.height();
+
+  // Map to normalized texture coordinates.
+  if (sampler != SAMPLER_TYPE_2D_RECT) {
+    gfx::Size texture_size = quad->texture_size;
+    DCHECK(!texture_size.IsEmpty());
+    fragment_tex_translate_x /= texture_size.width();
+    fragment_tex_translate_y /= texture_size.height();
+    fragment_tex_scale_x /= texture_size.width();
+    fragment_tex_scale_y /= texture_size.height();
+  }
+
+  TileProgramUniforms uniforms;
+  if (quad->swizzle_contents) {
+    TileUniformLocation(GetTileProgramSwizzleAA(tex_coord_precision, sampler),
+                        &uniforms);
+  } else {
+    TileUniformLocation(GetTileProgramAA(tex_coord_precision, sampler),
+                        &uniforms);
+  }
+
+  SetUseProgram(uniforms.program);
+  GLC(gl_, gl_->Uniform1i(uniforms.sampler_location, 0));
+
+  float viewport[4] = {
+      static_cast<float>(viewport_.x()),
+      static_cast<float>(viewport_.y()),
+      static_cast<float>(viewport_.width()),
+      static_cast<float>(viewport_.height()),
+  };
+  GLC(gl_, gl_->Uniform4fv(uniforms.viewport_location, 1, viewport));
+  GLC(gl_, gl_->Uniform3fv(uniforms.edge_location, 8, edge));
+
+  GLC(gl_,
+      gl_->Uniform4f(uniforms.vertex_tex_transform_location,
+                     vertex_tex_translate_x,
+                     vertex_tex_translate_y,
+                     vertex_tex_scale_x,
+                     vertex_tex_scale_y));
+  GLC(gl_,
+      gl_->Uniform4f(uniforms.fragment_tex_transform_location,
+                     fragment_tex_translate_x,
+                     fragment_tex_translate_y,
+                     fragment_tex_scale_x,
+                     fragment_tex_scale_y));
+
+  // Blending is required for antialiasing.
+  SetBlendEnabled(true);
+
+  // Normalize to tile_rect.
+  local_quad.Scale(1.0f / tile_rect.width(), 1.0f / tile_rect.height());
+
+  SetShaderOpacity(quad->opacity(), uniforms.alpha_location);
+  SetShaderQuadF(local_quad, uniforms.quad_location);
+
+  // The transform and vertex data are used to figure out the extents that the
+  // un-antialiased quad should have and which vertex this is and the float
+  // quad passed in via uniform is the actual geometry that gets used to draw
+  // it. This is why this centered rect is used and not the original quad_rect.
+  gfx::RectF centered_rect(
+      gfx::PointF(-0.5f * tile_rect.width(), -0.5f * tile_rect.height()),
+      tile_rect.size());
+  DrawQuadGeometry(
+      frame, quad->quadTransform(), centered_rect, uniforms.matrix_location);
+}
+
+void GLRenderer::DrawContentQuadNoAA(const DrawingFrame* frame,
+                                     const ContentDrawQuadBase* quad,
+                                     ResourceProvider::ResourceId resource_id,
+                                     const gfx::QuadF* clip_region) {
+  gfx::RectF tex_coord_rect = MathUtil::ScaleRectProportional(
+      quad->tex_coord_rect, quad->rect, quad->visible_rect);
+  float tex_to_geom_scale_x = quad->rect.width() / quad->tex_coord_rect.width();
+  float tex_to_geom_scale_y =
+      quad->rect.height() / quad->tex_coord_rect.height();
+
+  bool scaled = (tex_to_geom_scale_x != 1.f || tex_to_geom_scale_y != 1.f);
+  GLenum filter =
+      (scaled || !quad->quadTransform().IsIdentityOrIntegerTranslation()) &&
+              !quad->nearest_neighbor
+          ? GL_LINEAR
+          : GL_NEAREST;
+
+  ResourceProvider::ScopedSamplerGL quad_resource_lock(
+      resource_provider_, resource_id, filter);
+  SamplerType sampler =
+      SamplerTypeFromTextureTarget(quad_resource_lock.target());
+
+  float vertex_tex_translate_x = tex_coord_rect.x();
+  float vertex_tex_translate_y = tex_coord_rect.y();
+  float vertex_tex_scale_x = tex_coord_rect.width();
+  float vertex_tex_scale_y = tex_coord_rect.height();
+
+  // Map to normalized texture coordinates.
+  if (sampler != SAMPLER_TYPE_2D_RECT) {
+    gfx::Size texture_size = quad->texture_size;
+    DCHECK(!texture_size.IsEmpty());
+    vertex_tex_translate_x /= texture_size.width();
+    vertex_tex_translate_y /= texture_size.height();
+    vertex_tex_scale_x /= texture_size.width();
+    vertex_tex_scale_y /= texture_size.height();
+  }
+
+  TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
+      gl_, &highp_threshold_cache_, highp_threshold_min_, quad->texture_size);
+
+  TileProgramUniforms uniforms;
+  if (quad->ShouldDrawWithBlending()) {
+    if (quad->swizzle_contents) {
+      TileUniformLocation(GetTileProgramSwizzle(tex_coord_precision, sampler),
+                          &uniforms);
+    } else {
+      TileUniformLocation(GetTileProgram(tex_coord_precision, sampler),
+                          &uniforms);
+    }
+  } else {
+    if (quad->swizzle_contents) {
+      TileUniformLocation(
+          GetTileProgramSwizzleOpaque(tex_coord_precision, sampler), &uniforms);
+    } else {
+      TileUniformLocation(GetTileProgramOpaque(tex_coord_precision, sampler),
+                          &uniforms);
+    }
+  }
+
+  SetUseProgram(uniforms.program);
+  GLC(gl_, gl_->Uniform1i(uniforms.sampler_location, 0));
+
+  GLC(gl_,
+      gl_->Uniform4f(uniforms.vertex_tex_transform_location,
+                     vertex_tex_translate_x,
+                     vertex_tex_translate_y,
+                     vertex_tex_scale_x,
+                     vertex_tex_scale_y));
+
+  SetBlendEnabled(quad->ShouldDrawWithBlending());
+
+  SetShaderOpacity(quad->opacity(), uniforms.alpha_location);
+
+  // Pass quad coordinates to the uniform in the same order as GeometryBinding
+  // does, then vertices will match the texture mapping in the vertex buffer.
+  // The method SetShaderQuadF() changes the order of vertices and so it's
+  // not used here.
+  gfx::QuadF tile_rect(quad->visible_rect);
+  float width = quad->visible_rect.width();
+  float height = quad->visible_rect.height();
+  gfx::PointF top_left = quad->visible_rect.origin();
+  if (clip_region) {
+    tile_rect = *clip_region;
+    float gl_uv[8] = {
+        (tile_rect.p4().x() - top_left.x()) / width,
+        (tile_rect.p4().y() - top_left.y()) / height,
+        (tile_rect.p1().x() - top_left.x()) / width,
+        (tile_rect.p1().y() - top_left.y()) / height,
+        (tile_rect.p2().x() - top_left.x()) / width,
+        (tile_rect.p2().y() - top_left.y()) / height,
+        (tile_rect.p3().x() - top_left.x()) / width,
+        (tile_rect.p3().y() - top_left.y()) / height,
+    };
+    PrepareGeometry(CLIPPED_BINDING);
+    clipped_geometry_->InitializeCustomQuadWithUVs(
+        gfx::QuadF(quad->visible_rect), gl_uv);
+  } else {
+    PrepareGeometry(SHARED_BINDING);
+  }
+  float gl_quad[8] = {
+      tile_rect.p4().x(),
+      tile_rect.p4().y(),
+      tile_rect.p1().x(),
+      tile_rect.p1().y(),
+      tile_rect.p2().x(),
+      tile_rect.p2().y(),
+      tile_rect.p3().x(),
+      tile_rect.p3().y(),
+  };
+  GLC(gl_, gl_->Uniform2fv(uniforms.quad_location, 4, gl_quad));
+
+  static float gl_matrix[16];
+  ToGLMatrix(&gl_matrix[0], frame->projection_matrix * quad->quadTransform());
+  GLC(gl_,
+      gl_->UniformMatrix4fv(uniforms.matrix_location, 1, false, &gl_matrix[0]));
+
+  GLC(gl_, gl_->DrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0));
+}
+
+void GLRenderer::DrawYUVVideoQuad(const DrawingFrame* frame,
+                                  const YUVVideoDrawQuad* quad,
+                                  const gfx::QuadF* clip_region) {
+  SetBlendEnabled(quad->ShouldDrawWithBlending());
+
+  TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
+      gl_,
+      &highp_threshold_cache_,
+      highp_threshold_min_,
+      quad->shared_quad_state->visible_content_rect.bottom_right());
+
+  bool use_alpha_plane = quad->a_plane_resource_id != 0;
+
+  ResourceProvider::ScopedSamplerGL y_plane_lock(
+      resource_provider_, quad->y_plane_resource_id, GL_TEXTURE1, GL_LINEAR);
+  DCHECK_EQ(static_cast<GLenum>(GL_TEXTURE_2D), y_plane_lock.target());
+  ResourceProvider::ScopedSamplerGL u_plane_lock(
+      resource_provider_, quad->u_plane_resource_id, GL_TEXTURE2, GL_LINEAR);
+  DCHECK_EQ(static_cast<GLenum>(GL_TEXTURE_2D), u_plane_lock.target());
+  ResourceProvider::ScopedSamplerGL v_plane_lock(
+      resource_provider_, quad->v_plane_resource_id, GL_TEXTURE3, GL_LINEAR);
+  DCHECK_EQ(static_cast<GLenum>(GL_TEXTURE_2D), v_plane_lock.target());
+  scoped_ptr<ResourceProvider::ScopedSamplerGL> a_plane_lock;
+  if (use_alpha_plane) {
+    a_plane_lock.reset(new ResourceProvider::ScopedSamplerGL(
+        resource_provider_, quad->a_plane_resource_id, GL_TEXTURE4, GL_LINEAR));
+    DCHECK_EQ(static_cast<GLenum>(GL_TEXTURE_2D), a_plane_lock->target());
+  }
+
+  int matrix_location = -1;
+  int tex_scale_location = -1;
+  int tex_offset_location = -1;
+  int clamp_rect_location = -1;
+  int y_texture_location = -1;
+  int u_texture_location = -1;
+  int v_texture_location = -1;
+  int a_texture_location = -1;
+  int yuv_matrix_location = -1;
+  int yuv_adj_location = -1;
+  int alpha_location = -1;
+  if (use_alpha_plane) {
+    const VideoYUVAProgram* program = GetVideoYUVAProgram(tex_coord_precision);
+    DCHECK(program && (program->initialized() || IsContextLost()));
+    SetUseProgram(program->program());
+    matrix_location = program->vertex_shader().matrix_location();
+    tex_scale_location = program->vertex_shader().tex_scale_location();
+    tex_offset_location = program->vertex_shader().tex_offset_location();
+    y_texture_location = program->fragment_shader().y_texture_location();
+    u_texture_location = program->fragment_shader().u_texture_location();
+    v_texture_location = program->fragment_shader().v_texture_location();
+    a_texture_location = program->fragment_shader().a_texture_location();
+    yuv_matrix_location = program->fragment_shader().yuv_matrix_location();
+    yuv_adj_location = program->fragment_shader().yuv_adj_location();
+    clamp_rect_location = program->fragment_shader().clamp_rect_location();
+    alpha_location = program->fragment_shader().alpha_location();
+  } else {
+    const VideoYUVProgram* program = GetVideoYUVProgram(tex_coord_precision);
+    DCHECK(program && (program->initialized() || IsContextLost()));
+    SetUseProgram(program->program());
+    matrix_location = program->vertex_shader().matrix_location();
+    tex_scale_location = program->vertex_shader().tex_scale_location();
+    tex_offset_location = program->vertex_shader().tex_offset_location();
+    y_texture_location = program->fragment_shader().y_texture_location();
+    u_texture_location = program->fragment_shader().u_texture_location();
+    v_texture_location = program->fragment_shader().v_texture_location();
+    yuv_matrix_location = program->fragment_shader().yuv_matrix_location();
+    yuv_adj_location = program->fragment_shader().yuv_adj_location();
+    clamp_rect_location = program->fragment_shader().clamp_rect_location();
+    alpha_location = program->fragment_shader().alpha_location();
+  }
+
+  GLC(gl_,
+      gl_->Uniform2f(tex_scale_location,
+                     quad->tex_coord_rect.width(),
+                     quad->tex_coord_rect.height()));
+  GLC(gl_,
+      gl_->Uniform2f(tex_offset_location,
+                     quad->tex_coord_rect.x(),
+                     quad->tex_coord_rect.y()));
+  // Clamping to half a texel inside the tex coord rect prevents bilinear
+  // filtering from filtering outside the tex coord rect.
+  gfx::RectF clamp_rect(quad->tex_coord_rect);
+  // Special case: empty texture size implies no clamping.
+  if (!quad->tex_size.IsEmpty()) {
+    clamp_rect.Inset(0.5f / quad->tex_size.width(),
+                     0.5f / quad->tex_size.height());
+  }
+  GLC(gl_, gl_->Uniform4f(clamp_rect_location, clamp_rect.x(), clamp_rect.y(),
+                          clamp_rect.right(), clamp_rect.bottom()));
+
+  GLC(gl_, gl_->Uniform1i(y_texture_location, 1));
+  GLC(gl_, gl_->Uniform1i(u_texture_location, 2));
+  GLC(gl_, gl_->Uniform1i(v_texture_location, 3));
+  if (use_alpha_plane)
+    GLC(gl_, gl_->Uniform1i(a_texture_location, 4));
+
+  // These values are magic numbers that are used in the transformation from YUV
+  // to RGB color values.  They are taken from the following webpage:
+  // http://www.fourcc.org/fccyvrgb.php
+  float yuv_to_rgb_rec601[9] = {
+      1.164f, 1.164f, 1.164f, 0.0f, -.391f, 2.018f, 1.596f, -.813f, 0.0f,
+  };
+  float yuv_to_rgb_jpeg[9] = {
+      1.f, 1.f, 1.f, 0.0f, -.34414f, 1.772f, 1.402f, -.71414f, 0.0f,
+  };
+  float yuv_to_rgb_rec709[9] = {
+      1.164f, 1.164f, 1.164f, 0.0f, -0.213f, 2.112f, 1.793f, -0.533f, 0.0f,
+  };
+
+  // These values map to 16, 128, and 128 respectively, and are computed
+  // as a fraction over 256 (e.g. 16 / 256 = 0.0625).
+  // They are used in the YUV to RGBA conversion formula:
+  //   Y - 16   : Gives 16 values of head and footroom for overshooting
+  //   U - 128  : Turns unsigned U into signed U [-128,127]
+  //   V - 128  : Turns unsigned V into signed V [-128,127]
+  float yuv_adjust_constrained[3] = {
+      -0.0625f, -0.5f, -0.5f,
+  };
+
+  // Same as above, but without the head and footroom.
+  float yuv_adjust_full[3] = {
+      0.0f, -0.5f, -0.5f,
+  };
+
+  float* yuv_to_rgb = NULL;
+  float* yuv_adjust = NULL;
+
+  switch (quad->color_space) {
+    case YUVVideoDrawQuad::REC_601:
+      yuv_to_rgb = yuv_to_rgb_rec601;
+      yuv_adjust = yuv_adjust_constrained;
+      break;
+    case YUVVideoDrawQuad::REC_709:
+      yuv_to_rgb = yuv_to_rgb_rec709;
+      yuv_adjust = yuv_adjust_constrained;
+      break;
+    case YUVVideoDrawQuad::JPEG:
+      yuv_to_rgb = yuv_to_rgb_jpeg;
+      yuv_adjust = yuv_adjust_full;
+      break;
+  }
+
+  // The transform and vertex data are used to figure out the extents that the
+  // un-antialiased quad should have and which vertex this is and the float
+  // quad passed in via uniform is the actual geometry that gets used to draw
+  // it. This is why this centered rect is used and not the original quad_rect.
+  gfx::RectF tile_rect = quad->rect;
+  GLC(gl_, gl_->UniformMatrix3fv(yuv_matrix_location, 1, 0, yuv_to_rgb));
+  GLC(gl_, gl_->Uniform3fv(yuv_adj_location, 1, yuv_adjust));
+
+  SetShaderOpacity(quad->opacity(), alpha_location);
+  if (!clip_region) {
+    DrawQuadGeometry(frame, quad->quadTransform(), tile_rect, matrix_location);
+  } else {
+    float uvs[8] = {0};
+    GetScaledUVs(quad->visible_rect, clip_region, uvs);
+    gfx::QuadF region_quad = *clip_region;
+    region_quad.Scale(1.0f / tile_rect.width(), 1.0f / tile_rect.height());
+    region_quad -= gfx::Vector2dF(0.5f, 0.5f);
+    DrawQuadGeometryClippedByQuadF(frame, quad->quadTransform(), tile_rect,
+                                   region_quad, matrix_location, uvs);
+  }
+}
+
+void GLRenderer::DrawStreamVideoQuad(const DrawingFrame* frame,
+                                     const StreamVideoDrawQuad* quad,
+                                     const gfx::QuadF* clip_region) {
+  SetBlendEnabled(quad->ShouldDrawWithBlending());
+
+  static float gl_matrix[16];
+
+  DCHECK(capabilities_.using_egl_image);
+
+  TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
+      gl_,
+      &highp_threshold_cache_,
+      highp_threshold_min_,
+      quad->shared_quad_state->visible_content_rect.bottom_right());
+
+  const VideoStreamTextureProgram* program =
+      GetVideoStreamTextureProgram(tex_coord_precision);
+  SetUseProgram(program->program());
+
+  ToGLMatrix(&gl_matrix[0], quad->matrix);
+  GLC(gl_,
+      gl_->UniformMatrix4fv(
+          program->vertex_shader().tex_matrix_location(), 1, false, gl_matrix));
+
+  ResourceProvider::ScopedReadLockGL lock(resource_provider_,
+                                          quad->resource_id);
+  DCHECK_EQ(GL_TEXTURE0, GetActiveTextureUnit(gl_));
+  GLC(gl_, gl_->BindTexture(GL_TEXTURE_EXTERNAL_OES, lock.texture_id()));
+
+  GLC(gl_, gl_->Uniform1i(program->fragment_shader().sampler_location(), 0));
+
+  SetShaderOpacity(quad->opacity(),
+                   program->fragment_shader().alpha_location());
+  if (!clip_region) {
+    DrawQuadGeometry(frame, quad->quadTransform(), quad->rect,
+                     program->vertex_shader().matrix_location());
+  } else {
+    gfx::QuadF region_quad(*clip_region);
+    region_quad.Scale(1.0f / quad->rect.width(), 1.0f / quad->rect.height());
+    region_quad -= gfx::Vector2dF(0.5f, 0.5f);
+    float uvs[8] = {0};
+    GetScaledUVs(quad->visible_rect, clip_region, uvs);
+    DrawQuadGeometryClippedByQuadF(
+        frame, quad->quadTransform(), quad->rect, region_quad,
+        program->vertex_shader().matrix_location(), uvs);
+  }
+}
+
+struct TextureProgramBinding {
+  template <class Program>
+  void Set(Program* program) {
+    DCHECK(program);
+    program_id = program->program();
+    sampler_location = program->fragment_shader().sampler_location();
+    matrix_location = program->vertex_shader().matrix_location();
+    background_color_location =
+        program->fragment_shader().background_color_location();
+  }
+  int program_id;
+  int sampler_location;
+  int matrix_location;
+  int transform_location;
+  int background_color_location;
+};
+
+struct TexTransformTextureProgramBinding : TextureProgramBinding {
+  template <class Program>
+  void Set(Program* program) {
+    TextureProgramBinding::Set(program);
+    tex_transform_location = program->vertex_shader().tex_transform_location();
+    vertex_opacity_location =
+        program->vertex_shader().vertex_opacity_location();
+  }
+  int tex_transform_location;
+  int vertex_opacity_location;
+};
+
+void GLRenderer::FlushTextureQuadCache(BoundGeometry flush_binding) {
+  // Check to see if we have anything to draw.
+  if (draw_cache_.program_id == -1)
+    return;
+
+  PrepareGeometry(flush_binding);
+
+  // Set the correct blending mode.
+  SetBlendEnabled(draw_cache_.needs_blending);
+
+  // Bind the program to the GL state.
+  SetUseProgram(draw_cache_.program_id);
+
+  // Bind the correct texture sampler location.
+  GLC(gl_, gl_->Uniform1i(draw_cache_.sampler_location, 0));
+
+  // Assume the current active textures is 0.
+  ResourceProvider::ScopedSamplerGL locked_quad(
+      resource_provider_,
+      draw_cache_.resource_id,
+      draw_cache_.nearest_neighbor ? GL_NEAREST : GL_LINEAR);
+  DCHECK_EQ(GL_TEXTURE0, GetActiveTextureUnit(gl_));
+  GLC(gl_, gl_->BindTexture(GL_TEXTURE_2D, locked_quad.texture_id()));
+
+  static_assert(sizeof(Float4) == 4 * sizeof(float),
+                "Float4 struct should be densely packed");
+  static_assert(sizeof(Float16) == 16 * sizeof(float),
+                "Float16 struct should be densely packed");
+
+  // Upload the tranforms for both points and uvs.
+  GLC(gl_,
+      gl_->UniformMatrix4fv(
+          static_cast<int>(draw_cache_.matrix_location),
+          static_cast<int>(draw_cache_.matrix_data.size()),
+          false,
+          reinterpret_cast<float*>(&draw_cache_.matrix_data.front())));
+  GLC(gl_,
+      gl_->Uniform4fv(
+          static_cast<int>(draw_cache_.uv_xform_location),
+          static_cast<int>(draw_cache_.uv_xform_data.size()),
+          reinterpret_cast<float*>(&draw_cache_.uv_xform_data.front())));
+
+  if (draw_cache_.background_color != SK_ColorTRANSPARENT) {
+    Float4 background_color = PremultipliedColor(draw_cache_.background_color);
+    GLC(gl_,
+        gl_->Uniform4fv(
+            draw_cache_.background_color_location, 1, background_color.data));
+  }
+
+  GLC(gl_,
+      gl_->Uniform1fv(
+          static_cast<int>(draw_cache_.vertex_opacity_location),
+          static_cast<int>(draw_cache_.vertex_opacity_data.size()),
+          static_cast<float*>(&draw_cache_.vertex_opacity_data.front())));
+
+  // Draw the quads!
+  GLC(gl_,
+      gl_->DrawElements(GL_TRIANGLES,
+                        6 * draw_cache_.matrix_data.size(),
+                        GL_UNSIGNED_SHORT,
+                        0));
+
+  // Clear the cache.
+  draw_cache_.program_id = -1;
+  draw_cache_.uv_xform_data.resize(0);
+  draw_cache_.vertex_opacity_data.resize(0);
+  draw_cache_.matrix_data.resize(0);
+
+  // If we had a clipped binding, prepare the shared binding for the
+  // next inserts.
+  if (flush_binding == CLIPPED_BINDING) {
+    PrepareGeometry(SHARED_BINDING);
+  }
+}
+
+void GLRenderer::EnqueueTextureQuad(const DrawingFrame* frame,
+                                    const TextureDrawQuad* quad,
+                                    const gfx::QuadF* clip_region) {
+  // If we have a clip_region then we have to render the next quad
+  // with dynamic geometry, therefore we must flush all pending
+  // texture quads.
+  if (clip_region) {
+    // We send in false here because we want to flush what's currently in the
+    // queue using the shared_geometry and not clipped_geometry
+    FlushTextureQuadCache(SHARED_BINDING);
+  }
+
+  TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
+      gl_,
+      &highp_threshold_cache_,
+      highp_threshold_min_,
+      quad->shared_quad_state->visible_content_rect.bottom_right());
+
+  // Choose the correct texture program binding
+  TexTransformTextureProgramBinding binding;
+  if (quad->premultiplied_alpha) {
+    if (quad->background_color == SK_ColorTRANSPARENT) {
+      binding.Set(GetTextureProgram(tex_coord_precision));
+    } else {
+      binding.Set(GetTextureBackgroundProgram(tex_coord_precision));
+    }
+  } else {
+    if (quad->background_color == SK_ColorTRANSPARENT) {
+      binding.Set(GetNonPremultipliedTextureProgram(tex_coord_precision));
+    } else {
+      binding.Set(
+          GetNonPremultipliedTextureBackgroundProgram(tex_coord_precision));
+    }
+  }
+
+  int resource_id = quad->resource_id;
+
+  if (draw_cache_.program_id != binding.program_id ||
+      draw_cache_.resource_id != resource_id ||
+      draw_cache_.needs_blending != quad->ShouldDrawWithBlending() ||
+      draw_cache_.nearest_neighbor != quad->nearest_neighbor ||
+      draw_cache_.background_color != quad->background_color ||
+      draw_cache_.matrix_data.size() >= 8) {
+    FlushTextureQuadCache(SHARED_BINDING);
+    draw_cache_.program_id = binding.program_id;
+    draw_cache_.resource_id = resource_id;
+    draw_cache_.needs_blending = quad->ShouldDrawWithBlending();
+    draw_cache_.nearest_neighbor = quad->nearest_neighbor;
+    draw_cache_.background_color = quad->background_color;
+
+    draw_cache_.uv_xform_location = binding.tex_transform_location;
+    draw_cache_.background_color_location = binding.background_color_location;
+    draw_cache_.vertex_opacity_location = binding.vertex_opacity_location;
+    draw_cache_.matrix_location = binding.matrix_location;
+    draw_cache_.sampler_location = binding.sampler_location;
+  }
+
+  // Generate the uv-transform
+  if (!clip_region) {
+    draw_cache_.uv_xform_data.push_back(UVTransform(quad));
+  } else {
+    Float4 uv_transform = {{0.0f, 0.0f, 1.0f, 1.0f}};
+    draw_cache_.uv_xform_data.push_back(uv_transform);
+  }
+
+  // Generate the vertex opacity
+  const float opacity = quad->opacity();
+  draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[0] * opacity);
+  draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[1] * opacity);
+  draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[2] * opacity);
+  draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[3] * opacity);
+
+  // Generate the transform matrix
+  gfx::Transform quad_rect_matrix;
+  QuadRectTransform(&quad_rect_matrix, quad->quadTransform(), quad->rect);
+  quad_rect_matrix = frame->projection_matrix * quad_rect_matrix;
+
+  Float16 m;
+  quad_rect_matrix.matrix().asColMajorf(m.data);
+  draw_cache_.matrix_data.push_back(m);
+
+  if (clip_region) {
+    gfx::QuadF scaled_region;
+    if (!GetScaledRegion(quad->rect, clip_region, &scaled_region)) {
+      scaled_region = SharedGeometryQuad().BoundingBox();
+    }
+    // Both the scaled region and the SharedGeomtryQuad are in the space
+    // -0.5->0.5. We need to move that to the space 0->1.
+    float uv[8];
+    uv[0] = scaled_region.p1().x() + 0.5f;
+    uv[1] = scaled_region.p1().y() + 0.5f;
+    uv[2] = scaled_region.p2().x() + 0.5f;
+    uv[3] = scaled_region.p2().y() + 0.5f;
+    uv[4] = scaled_region.p3().x() + 0.5f;
+    uv[5] = scaled_region.p3().y() + 0.5f;
+    uv[6] = scaled_region.p4().x() + 0.5f;
+    uv[7] = scaled_region.p4().y() + 0.5f;
+    PrepareGeometry(CLIPPED_BINDING);
+    clipped_geometry_->InitializeCustomQuadWithUVs(scaled_region, uv);
+    FlushTextureQuadCache(CLIPPED_BINDING);
+  }
+}
+
+void GLRenderer::DrawIOSurfaceQuad(const DrawingFrame* frame,
+                                   const IOSurfaceDrawQuad* quad,
+                                   const gfx::QuadF* clip_region) {
+  SetBlendEnabled(quad->ShouldDrawWithBlending());
+
+  TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
+      gl_,
+      &highp_threshold_cache_,
+      highp_threshold_min_,
+      quad->shared_quad_state->visible_content_rect.bottom_right());
+
+  TexTransformTextureProgramBinding binding;
+  binding.Set(GetTextureIOSurfaceProgram(tex_coord_precision));
+
+  SetUseProgram(binding.program_id);
+  GLC(gl_, gl_->Uniform1i(binding.sampler_location, 0));
+  if (quad->orientation == IOSurfaceDrawQuad::FLIPPED) {
+    GLC(gl_,
+        gl_->Uniform4f(binding.tex_transform_location,
+                       0,
+                       quad->io_surface_size.height(),
+                       quad->io_surface_size.width(),
+                       quad->io_surface_size.height() * -1.0f));
+  } else {
+    GLC(gl_,
+        gl_->Uniform4f(binding.tex_transform_location,
+                       0,
+                       0,
+                       quad->io_surface_size.width(),
+                       quad->io_surface_size.height()));
+  }
+
+  const float vertex_opacity[] = {quad->opacity(), quad->opacity(),
+                                  quad->opacity(), quad->opacity()};
+  GLC(gl_, gl_->Uniform1fv(binding.vertex_opacity_location, 4, vertex_opacity));
+
+  ResourceProvider::ScopedReadLockGL lock(resource_provider_,
+                                          quad->io_surface_resource_id);
+  DCHECK_EQ(GL_TEXTURE0, GetActiveTextureUnit(gl_));
+  GLC(gl_, gl_->BindTexture(GL_TEXTURE_RECTANGLE_ARB, lock.texture_id()));
+
+  if (!clip_region) {
+    DrawQuadGeometry(frame, quad->quadTransform(), quad->rect,
+                     binding.matrix_location);
+  } else {
+    float uvs[8] = {0};
+    GetScaledUVs(quad->visible_rect, clip_region, uvs);
+    DrawQuadGeometryClippedByQuadF(frame, quad->quadTransform(), quad->rect,
+                                   *clip_region, binding.matrix_location, uvs);
+  }
+
+  GLC(gl_, gl_->BindTexture(GL_TEXTURE_RECTANGLE_ARB, 0));
+}
+
+void GLRenderer::FinishDrawingFrame(DrawingFrame* frame) {
+  if (use_sync_query_) {
+    DCHECK(current_sync_query_);
+    current_sync_query_->End();
+    pending_sync_queries_.push_back(current_sync_query_.Pass());
+  }
+
+  current_framebuffer_lock_ = nullptr;
+  swap_buffer_rect_.Union(gfx::ToEnclosingRect(frame->root_damage_rect));
+
+  GLC(gl_, gl_->Disable(GL_BLEND));
+  blend_shadow_ = false;
+
+  ScheduleOverlays(frame);
+}
+
+void GLRenderer::FinishDrawingQuadList() {
+  FlushTextureQuadCache(SHARED_BINDING);
+}
+
+bool GLRenderer::FlippedFramebuffer(const DrawingFrame* frame) const {
+  if (frame->current_render_pass != frame->root_render_pass)
+    return true;
+  return FlippedRootFramebuffer();
+}
+
+bool GLRenderer::FlippedRootFramebuffer() const {
+  // GL is normally flipped, so a flipped output results in an unflipping.
+  return !output_surface_->capabilities().flipped_output_surface;
+}
+
+void GLRenderer::EnsureScissorTestEnabled() {
+  if (is_scissor_enabled_)
+    return;
+
+  FlushTextureQuadCache(SHARED_BINDING);
+  GLC(gl_, gl_->Enable(GL_SCISSOR_TEST));
+  is_scissor_enabled_ = true;
+}
+
+void GLRenderer::EnsureScissorTestDisabled() {
+  if (!is_scissor_enabled_)
+    return;
+
+  FlushTextureQuadCache(SHARED_BINDING);
+  GLC(gl_, gl_->Disable(GL_SCISSOR_TEST));
+  is_scissor_enabled_ = false;
+}
+
+void GLRenderer::CopyCurrentRenderPassToBitmap(
+    DrawingFrame* frame,
+    scoped_ptr<CopyOutputRequest> request) {
+  TRACE_EVENT0("cc", "GLRenderer::CopyCurrentRenderPassToBitmap");
+  gfx::Rect copy_rect = frame->current_render_pass->output_rect;
+  if (request->has_area())
+    copy_rect.Intersect(request->area());
+  GetFramebufferPixelsAsync(frame, copy_rect, request.Pass());
+}
+
+void GLRenderer::ToGLMatrix(float* gl_matrix, const gfx::Transform& transform) {
+  transform.matrix().asColMajorf(gl_matrix);
+}
+
+void GLRenderer::SetShaderQuadF(const gfx::QuadF& quad, int quad_location) {
+  if (quad_location == -1)
+    return;
+
+  float gl_quad[8];
+  gl_quad[0] = quad.p1().x();
+  gl_quad[1] = quad.p1().y();
+  gl_quad[2] = quad.p2().x();
+  gl_quad[3] = quad.p2().y();
+  gl_quad[4] = quad.p3().x();
+  gl_quad[5] = quad.p3().y();
+  gl_quad[6] = quad.p4().x();
+  gl_quad[7] = quad.p4().y();
+  GLC(gl_, gl_->Uniform2fv(quad_location, 4, gl_quad));
+}
+
+void GLRenderer::SetShaderOpacity(float opacity, int alpha_location) {
+  if (alpha_location != -1)
+    GLC(gl_, gl_->Uniform1f(alpha_location, opacity));
+}
+
+void GLRenderer::SetStencilEnabled(bool enabled) {
+  if (enabled == stencil_shadow_)
+    return;
+
+  if (enabled)
+    GLC(gl_, gl_->Enable(GL_STENCIL_TEST));
+  else
+    GLC(gl_, gl_->Disable(GL_STENCIL_TEST));
+  stencil_shadow_ = enabled;
+}
+
+void GLRenderer::SetBlendEnabled(bool enabled) {
+  if (enabled == blend_shadow_)
+    return;
+
+  if (enabled)
+    GLC(gl_, gl_->Enable(GL_BLEND));
+  else
+    GLC(gl_, gl_->Disable(GL_BLEND));
+  blend_shadow_ = enabled;
+}
+
+void GLRenderer::SetUseProgram(unsigned program) {
+  if (program == program_shadow_)
+    return;
+  gl_->UseProgram(program);
+  program_shadow_ = program;
+}
+
+void GLRenderer::DrawQuadGeometryClippedByQuadF(
+    const DrawingFrame* frame,
+    const gfx::Transform& draw_transform,
+    const gfx::RectF& quad_rect,
+    const gfx::QuadF& clipping_region_quad,
+    int matrix_location,
+    const float* uvs) {
+  PrepareGeometry(CLIPPED_BINDING);
+  if (uvs) {
+    clipped_geometry_->InitializeCustomQuadWithUVs(clipping_region_quad, uvs);
+  } else {
+    clipped_geometry_->InitializeCustomQuad(clipping_region_quad);
+  }
+  gfx::Transform quad_rect_matrix;
+  QuadRectTransform(&quad_rect_matrix, draw_transform, quad_rect);
+  static float gl_matrix[16];
+  ToGLMatrix(&gl_matrix[0], frame->projection_matrix * quad_rect_matrix);
+  GLC(gl_, gl_->UniformMatrix4fv(matrix_location, 1, false, &gl_matrix[0]));
+
+  GLC(gl_, gl_->DrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT,
+                             reinterpret_cast<const void*>(0)));
+}
+
+void GLRenderer::DrawQuadGeometry(const DrawingFrame* frame,
+                                  const gfx::Transform& draw_transform,
+                                  const gfx::RectF& quad_rect,
+                                  int matrix_location) {
+  PrepareGeometry(SHARED_BINDING);
+  gfx::Transform quad_rect_matrix;
+  QuadRectTransform(&quad_rect_matrix, draw_transform, quad_rect);
+  static float gl_matrix[16];
+  ToGLMatrix(&gl_matrix[0], frame->projection_matrix * quad_rect_matrix);
+  GLC(gl_, gl_->UniformMatrix4fv(matrix_location, 1, false, &gl_matrix[0]));
+
+  GLC(gl_, gl_->DrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0));
+}
+
+void GLRenderer::Finish() {
+  TRACE_EVENT0("cc", "GLRenderer::Finish");
+  GLC(gl_, gl_->Finish());
+}
+
+void GLRenderer::SwapBuffers(const CompositorFrameMetadata& metadata) {
+  DCHECK(!is_backbuffer_discarded_);
+
+  TRACE_EVENT0("cc,benchmark", "GLRenderer::SwapBuffers");
+  // We're done! Time to swapbuffers!
+
+  gfx::Size surface_size = output_surface_->SurfaceSize();
+
+  CompositorFrame compositor_frame;
+  compositor_frame.metadata = metadata;
+  compositor_frame.gl_frame_data = make_scoped_ptr(new GLFrameData);
+  compositor_frame.gl_frame_data->size = surface_size;
+  if (capabilities_.using_partial_swap) {
+    // If supported, we can save significant bandwidth by only swapping the
+    // damaged/scissored region (clamped to the viewport).
+    swap_buffer_rect_.Intersect(gfx::Rect(surface_size));
+    int flipped_y_pos_of_rect_bottom = surface_size.height() -
+                                       swap_buffer_rect_.y() -
+                                       swap_buffer_rect_.height();
+    compositor_frame.gl_frame_data->sub_buffer_rect =
+        gfx::Rect(swap_buffer_rect_.x(),
+                  FlippedRootFramebuffer() ? flipped_y_pos_of_rect_bottom
+                                           : swap_buffer_rect_.y(),
+                  swap_buffer_rect_.width(),
+                  swap_buffer_rect_.height());
+  } else {
+    compositor_frame.gl_frame_data->sub_buffer_rect =
+        gfx::Rect(output_surface_->SurfaceSize());
+  }
+  output_surface_->SwapBuffers(&compositor_frame);
+
+  // Release previously used overlay resources and hold onto the pending ones
+  // until the next swap buffers.
+  in_use_overlay_resources_.clear();
+  in_use_overlay_resources_.swap(pending_overlay_resources_);
+
+  swap_buffer_rect_ = gfx::Rect();
+}
+
+void GLRenderer::EnforceMemoryPolicy() {
+  if (!visible()) {
+    TRACE_EVENT0("cc", "GLRenderer::EnforceMemoryPolicy dropping resources");
+    ReleaseRenderPassTextures();
+    DiscardBackbuffer();
+    resource_provider_->ReleaseCachedData();
+    output_surface_->context_provider()->DeleteCachedResources();
+    GLC(gl_, gl_->Flush());
+  }
+  PrepareGeometry(NO_BINDING);
+}
+
+void GLRenderer::DiscardBackbuffer() {
+  if (is_backbuffer_discarded_)
+    return;
+
+  output_surface_->DiscardBackbuffer();
+
+  is_backbuffer_discarded_ = true;
+
+  // Damage tracker needs a full reset every time framebuffer is discarded.
+  client_->SetFullRootLayerDamage();
+}
+
+void GLRenderer::EnsureBackbuffer() {
+  if (!is_backbuffer_discarded_)
+    return;
+
+  output_surface_->EnsureBackbuffer();
+  is_backbuffer_discarded_ = false;
+}
+
+void GLRenderer::GetFramebufferPixelsAsync(
+    const DrawingFrame* frame,
+    const gfx::Rect& rect,
+    scoped_ptr<CopyOutputRequest> request) {
+  DCHECK(!request->IsEmpty());
+  if (request->IsEmpty())
+    return;
+  if (rect.IsEmpty())
+    return;
+
+  gfx::Rect window_rect = MoveFromDrawToWindowSpace(frame, rect);
+  DCHECK_GE(window_rect.x(), 0);
+  DCHECK_GE(window_rect.y(), 0);
+  DCHECK_LE(window_rect.right(), current_surface_size_.width());
+  DCHECK_LE(window_rect.bottom(), current_surface_size_.height());
+
+  if (!request->force_bitmap_result()) {
+    bool own_mailbox = !request->has_texture_mailbox();
+
+    GLuint texture_id = 0;
+    gpu::Mailbox mailbox;
+    if (own_mailbox) {
+      GLC(gl_, gl_->GenMailboxCHROMIUM(mailbox.name));
+      gl_->GenTextures(1, &texture_id);
+      GLC(gl_, gl_->BindTexture(GL_TEXTURE_2D, texture_id));
+
+      GLC(gl_,
+          gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
+      GLC(gl_,
+          gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
+      GLC(gl_,
+          gl_->TexParameteri(
+              GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));
+      GLC(gl_,
+          gl_->TexParameteri(
+              GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));
+      GLC(gl_, gl_->ProduceTextureCHROMIUM(GL_TEXTURE_2D, mailbox.name));
+    } else {
+      mailbox = request->texture_mailbox().mailbox();
+      DCHECK_EQ(static_cast<unsigned>(GL_TEXTURE_2D),
+                request->texture_mailbox().target());
+      DCHECK(!mailbox.IsZero());
+      unsigned incoming_sync_point = request->texture_mailbox().sync_point();
+      if (incoming_sync_point)
+        GLC(gl_, gl_->WaitSyncPointCHROMIUM(incoming_sync_point));
+
+      texture_id = GLC(
+          gl_,
+          gl_->CreateAndConsumeTextureCHROMIUM(GL_TEXTURE_2D, mailbox.name));
+    }
+    GetFramebufferTexture(texture_id, RGBA_8888, window_rect);
+
+    unsigned sync_point = gl_->InsertSyncPointCHROMIUM();
+    TextureMailbox texture_mailbox(mailbox, GL_TEXTURE_2D, sync_point);
+
+    scoped_ptr<SingleReleaseCallback> release_callback;
+    if (own_mailbox) {
+      GLC(gl_, gl_->BindTexture(GL_TEXTURE_2D, 0));
+      release_callback = texture_mailbox_deleter_->GetReleaseCallback(
+          output_surface_->context_provider(), texture_id);
+    } else {
+      gl_->DeleteTextures(1, &texture_id);
+    }
+
+    request->SendTextureResult(
+        window_rect.size(), texture_mailbox, release_callback.Pass());
+    return;
+  }
+
+  DCHECK(request->force_bitmap_result());
+
+  scoped_ptr<PendingAsyncReadPixels> pending_read(new PendingAsyncReadPixels);
+  pending_read->copy_request = request.Pass();
+  pending_async_read_pixels_.insert(pending_async_read_pixels_.begin(),
+                                    pending_read.Pass());
+
+  bool do_workaround = NeedsIOSurfaceReadbackWorkaround();
+
+  unsigned temporary_texture = 0;
+  unsigned temporary_fbo = 0;
+
+  if (do_workaround) {
+    // On Mac OS X, calling glReadPixels() against an FBO whose color attachment
+    // is an IOSurface-backed texture causes corruption of future glReadPixels()
+    // calls, even those on different OpenGL contexts. It is believed that this
+    // is the root cause of top crasher
+    // http://crbug.com/99393. <rdar://problem/10949687>
+
+    gl_->GenTextures(1, &temporary_texture);
+    GLC(gl_, gl_->BindTexture(GL_TEXTURE_2D, temporary_texture));
+    GLC(gl_,
+        gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
+    GLC(gl_,
+        gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
+    GLC(gl_,
+        gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));
+    GLC(gl_,
+        gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));
+    // Copy the contents of the current (IOSurface-backed) framebuffer into a
+    // temporary texture.
+    GetFramebufferTexture(
+        temporary_texture, RGBA_8888, gfx::Rect(current_surface_size_));
+    gl_->GenFramebuffers(1, &temporary_fbo);
+    // Attach this texture to an FBO, and perform the readback from that FBO.
+    GLC(gl_, gl_->BindFramebuffer(GL_FRAMEBUFFER, temporary_fbo));
+    GLC(gl_,
+        gl_->FramebufferTexture2D(GL_FRAMEBUFFER,
+                                  GL_COLOR_ATTACHMENT0,
+                                  GL_TEXTURE_2D,
+                                  temporary_texture,
+                                  0));
+
+    DCHECK_EQ(static_cast<unsigned>(GL_FRAMEBUFFER_COMPLETE),
+              gl_->CheckFramebufferStatus(GL_FRAMEBUFFER));
+  }
+
+  GLuint buffer = 0;
+  gl_->GenBuffers(1, &buffer);
+  GLC(gl_, gl_->BindBuffer(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, buffer));
+  GLC(gl_,
+      gl_->BufferData(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM,
+                      4 * window_rect.size().GetArea(),
+                      NULL,
+                      GL_STREAM_READ));
+
+  GLuint query = 0;
+  gl_->GenQueriesEXT(1, &query);
+  GLC(gl_, gl_->BeginQueryEXT(GL_ASYNC_PIXEL_PACK_COMPLETED_CHROMIUM, query));
+
+  GLC(gl_,
+      gl_->ReadPixels(window_rect.x(),
+                      window_rect.y(),
+                      window_rect.width(),
+                      window_rect.height(),
+                      GL_RGBA,
+                      GL_UNSIGNED_BYTE,
+                      NULL));
+
+  GLC(gl_, gl_->BindBuffer(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, 0));
+
+  if (do_workaround) {
+    // Clean up.
+    GLC(gl_, gl_->BindFramebuffer(GL_FRAMEBUFFER, 0));
+    GLC(gl_, gl_->BindTexture(GL_TEXTURE_2D, 0));
+    GLC(gl_, gl_->DeleteFramebuffers(1, &temporary_fbo));
+    GLC(gl_, gl_->DeleteTextures(1, &temporary_texture));
+  }
+
+  base::Closure finished_callback = base::Bind(&GLRenderer::FinishedReadback,
+                                               base::Unretained(this),
+                                               buffer,
+                                               query,
+                                               window_rect.size());
+  // Save the finished_callback so it can be cancelled.
+  pending_async_read_pixels_.front()->finished_read_pixels_callback.Reset(
+      finished_callback);
+  base::Closure cancelable_callback =
+      pending_async_read_pixels_.front()->
+          finished_read_pixels_callback.callback();
+
+  // Save the buffer to verify the callbacks happen in the expected order.
+  pending_async_read_pixels_.front()->buffer = buffer;
+
+  GLC(gl_, gl_->EndQueryEXT(GL_ASYNC_PIXEL_PACK_COMPLETED_CHROMIUM));
+  context_support_->SignalQuery(query, cancelable_callback);
+
+  EnforceMemoryPolicy();
+}
+
+void GLRenderer::FinishedReadback(unsigned source_buffer,
+                                  unsigned query,
+                                  const gfx::Size& size) {
+  DCHECK(!pending_async_read_pixels_.empty());
+
+  if (query != 0) {
+    GLC(gl_, gl_->DeleteQueriesEXT(1, &query));
+  }
+
+  PendingAsyncReadPixels* current_read = pending_async_read_pixels_.back();
+  // Make sure we service the readbacks in order.
+  DCHECK_EQ(source_buffer, current_read->buffer);
+
+  uint8* src_pixels = NULL;
+  scoped_ptr<SkBitmap> bitmap;
+
+  if (source_buffer != 0) {
+    GLC(gl_,
+        gl_->BindBuffer(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, source_buffer));
+    src_pixels = static_cast<uint8*>(gl_->MapBufferCHROMIUM(
+        GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, GL_READ_ONLY));
+
+    if (src_pixels) {
+      bitmap.reset(new SkBitmap);
+      bitmap->allocN32Pixels(size.width(), size.height());
+      scoped_ptr<SkAutoLockPixels> lock(new SkAutoLockPixels(*bitmap));
+      uint8* dest_pixels = static_cast<uint8*>(bitmap->getPixels());
+
+      size_t row_bytes = size.width() * 4;
+      int num_rows = size.height();
+      size_t total_bytes = num_rows * row_bytes;
+      for (size_t dest_y = 0; dest_y < total_bytes; dest_y += row_bytes) {
+        // Flip Y axis.
+        size_t src_y = total_bytes - dest_y - row_bytes;
+        // Swizzle OpenGL -> Skia byte order.
+        for (size_t x = 0; x < row_bytes; x += 4) {
+          dest_pixels[dest_y + x + SK_R32_SHIFT / 8] =
+              src_pixels[src_y + x + 0];
+          dest_pixels[dest_y + x + SK_G32_SHIFT / 8] =
+              src_pixels[src_y + x + 1];
+          dest_pixels[dest_y + x + SK_B32_SHIFT / 8] =
+              src_pixels[src_y + x + 2];
+          dest_pixels[dest_y + x + SK_A32_SHIFT / 8] =
+              src_pixels[src_y + x + 3];
+        }
+      }
+
+      GLC(gl_,
+          gl_->UnmapBufferCHROMIUM(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM));
+    }
+    GLC(gl_, gl_->BindBuffer(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, 0));
+    GLC(gl_, gl_->DeleteBuffers(1, &source_buffer));
+  }
+
+  if (bitmap)
+    current_read->copy_request->SendBitmapResult(bitmap.Pass());
+  pending_async_read_pixels_.pop_back();
+}
+
+void GLRenderer::GetFramebufferTexture(unsigned texture_id,
+                                       ResourceFormat texture_format,
+                                       const gfx::Rect& window_rect) {
+  DCHECK(texture_id);
+  DCHECK_GE(window_rect.x(), 0);
+  DCHECK_GE(window_rect.y(), 0);
+  DCHECK_LE(window_rect.right(), current_surface_size_.width());
+  DCHECK_LE(window_rect.bottom(), current_surface_size_.height());
+
+  GLC(gl_, gl_->BindTexture(GL_TEXTURE_2D, texture_id));
+  GLC(gl_,
+      gl_->CopyTexImage2D(GL_TEXTURE_2D,
+                          0,
+                          GLDataFormat(texture_format),
+                          window_rect.x(),
+                          window_rect.y(),
+                          window_rect.width(),
+                          window_rect.height(),
+                          0));
+  GLC(gl_, gl_->BindTexture(GL_TEXTURE_2D, 0));
+}
+
+bool GLRenderer::UseScopedTexture(DrawingFrame* frame,
+                                  const ScopedResource* texture,
+                                  const gfx::Rect& viewport_rect) {
+  DCHECK(texture->id());
+  frame->current_render_pass = NULL;
+  frame->current_texture = texture;
+
+  return BindFramebufferToTexture(frame, texture, viewport_rect);
+}
+
+void GLRenderer::BindFramebufferToOutputSurface(DrawingFrame* frame) {
+  current_framebuffer_lock_ = nullptr;
+  output_surface_->BindFramebuffer();
+
+  if (output_surface_->HasExternalStencilTest()) {
+    SetStencilEnabled(true);
+    GLC(gl_, gl_->StencilFunc(GL_EQUAL, 1, 1));
+  } else {
+    SetStencilEnabled(false);
+  }
+}
+
+bool GLRenderer::BindFramebufferToTexture(DrawingFrame* frame,
+                                          const ScopedResource* texture,
+                                          const gfx::Rect& target_rect) {
+  DCHECK(texture->id());
+
+  // Explicitly release lock, otherwise we can crash when try to lock
+  // same texture again.
+  current_framebuffer_lock_ = nullptr;
+
+  SetStencilEnabled(false);
+  GLC(gl_, gl_->BindFramebuffer(GL_FRAMEBUFFER, offscreen_framebuffer_id_));
+  current_framebuffer_lock_ =
+      make_scoped_ptr(new ResourceProvider::ScopedWriteLockGL(
+          resource_provider_, texture->id()));
+  unsigned texture_id = current_framebuffer_lock_->texture_id();
+  GLC(gl_,
+      gl_->FramebufferTexture2D(
+          GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture_id, 0));
+
+  DCHECK(gl_->CheckFramebufferStatus(GL_FRAMEBUFFER) ==
+             GL_FRAMEBUFFER_COMPLETE ||
+         IsContextLost());
+  return true;
+}
+
+void GLRenderer::SetScissorTestRect(const gfx::Rect& scissor_rect) {
+  EnsureScissorTestEnabled();
+
+  // Don't unnecessarily ask the context to change the scissor, because it
+  // may cause undesired GPU pipeline flushes.
+  if (scissor_rect == scissor_rect_ && !scissor_rect_needs_reset_)
+    return;
+
+  scissor_rect_ = scissor_rect;
+  FlushTextureQuadCache(SHARED_BINDING);
+  GLC(gl_,
+      gl_->Scissor(scissor_rect.x(),
+                   scissor_rect.y(),
+                   scissor_rect.width(),
+                   scissor_rect.height()));
+
+  scissor_rect_needs_reset_ = false;
+}
+
+void GLRenderer::SetDrawViewport(const gfx::Rect& window_space_viewport) {
+  viewport_ = window_space_viewport;
+  GLC(gl_,
+      gl_->Viewport(window_space_viewport.x(),
+                    window_space_viewport.y(),
+                    window_space_viewport.width(),
+                    window_space_viewport.height()));
+}
+
+void GLRenderer::InitializeSharedObjects() {
+  TRACE_EVENT0("cc", "GLRenderer::InitializeSharedObjects");
+
+  // Create an FBO for doing offscreen rendering.
+  GLC(gl_, gl_->GenFramebuffers(1, &offscreen_framebuffer_id_));
+
+  shared_geometry_ =
+      make_scoped_ptr(new StaticGeometryBinding(gl_, QuadVertexRect()));
+  clipped_geometry_ = make_scoped_ptr(new DynamicGeometryBinding(gl_));
+}
+
+void GLRenderer::PrepareGeometry(BoundGeometry binding) {
+  if (binding == bound_geometry_) {
+    return;
+  }
+
+  switch (binding) {
+    case SHARED_BINDING:
+      shared_geometry_->PrepareForDraw();
+      break;
+    case CLIPPED_BINDING:
+      clipped_geometry_->PrepareForDraw();
+      break;
+    case NO_BINDING:
+      break;
+  }
+  bound_geometry_ = binding;
+}
+
+const GLRenderer::TileCheckerboardProgram*
+GLRenderer::GetTileCheckerboardProgram() {
+  if (!tile_checkerboard_program_.initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::checkerboardProgram::initalize");
+    tile_checkerboard_program_.Initialize(output_surface_->context_provider(),
+                                          TEX_COORD_PRECISION_NA,
+                                          SAMPLER_TYPE_NA);
+  }
+  return &tile_checkerboard_program_;
+}
+
+const GLRenderer::DebugBorderProgram* GLRenderer::GetDebugBorderProgram() {
+  if (!debug_border_program_.initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::debugBorderProgram::initialize");
+    debug_border_program_.Initialize(output_surface_->context_provider(),
+                                     TEX_COORD_PRECISION_NA, SAMPLER_TYPE_NA);
+  }
+  return &debug_border_program_;
+}
+
+const GLRenderer::SolidColorProgram* GLRenderer::GetSolidColorProgram() {
+  if (!solid_color_program_.initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::solidColorProgram::initialize");
+    solid_color_program_.Initialize(output_surface_->context_provider(),
+                                    TEX_COORD_PRECISION_NA, SAMPLER_TYPE_NA);
+  }
+  return &solid_color_program_;
+}
+
+const GLRenderer::SolidColorProgramAA* GLRenderer::GetSolidColorProgramAA() {
+  if (!solid_color_program_aa_.initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::solidColorProgramAA::initialize");
+    solid_color_program_aa_.Initialize(output_surface_->context_provider(),
+                                       TEX_COORD_PRECISION_NA, SAMPLER_TYPE_NA);
+  }
+  return &solid_color_program_aa_;
+}
+
+const GLRenderer::RenderPassProgram* GLRenderer::GetRenderPassProgram(
+    TexCoordPrecision precision,
+    BlendMode blend_mode) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  DCHECK_GE(blend_mode, 0);
+  DCHECK_LE(blend_mode, LAST_BLEND_MODE);
+  RenderPassProgram* program = &render_pass_program_[precision][blend_mode];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::renderPassProgram::initialize");
+    program->Initialize(output_surface_->context_provider(), precision,
+                        SAMPLER_TYPE_2D, blend_mode);
+  }
+  return program;
+}
+
+const GLRenderer::RenderPassProgramAA* GLRenderer::GetRenderPassProgramAA(
+    TexCoordPrecision precision,
+    BlendMode blend_mode) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  DCHECK_GE(blend_mode, 0);
+  DCHECK_LE(blend_mode, LAST_BLEND_MODE);
+  RenderPassProgramAA* program =
+      &render_pass_program_aa_[precision][blend_mode];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::renderPassProgramAA::initialize");
+    program->Initialize(output_surface_->context_provider(), precision,
+                        SAMPLER_TYPE_2D, blend_mode);
+  }
+  return program;
+}
+
+const GLRenderer::RenderPassMaskProgram* GLRenderer::GetRenderPassMaskProgram(
+    TexCoordPrecision precision,
+    SamplerType sampler,
+    BlendMode blend_mode,
+    bool mask_for_background) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  DCHECK_GE(sampler, 0);
+  DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
+  DCHECK_GE(blend_mode, 0);
+  DCHECK_LE(blend_mode, LAST_BLEND_MODE);
+  RenderPassMaskProgram* program =
+      &render_pass_mask_program_[precision][sampler][blend_mode]
+                                [mask_for_background ? HAS_MASK : NO_MASK];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::renderPassMaskProgram::initialize");
+    program->Initialize(
+        output_surface_->context_provider(), precision,
+        sampler, blend_mode, mask_for_background);
+  }
+  return program;
+}
+
+const GLRenderer::RenderPassMaskProgramAA*
+GLRenderer::GetRenderPassMaskProgramAA(TexCoordPrecision precision,
+                                       SamplerType sampler,
+                                       BlendMode blend_mode,
+                                       bool mask_for_background) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  DCHECK_GE(sampler, 0);
+  DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
+  DCHECK_GE(blend_mode, 0);
+  DCHECK_LE(blend_mode, LAST_BLEND_MODE);
+  RenderPassMaskProgramAA* program =
+      &render_pass_mask_program_aa_[precision][sampler][blend_mode]
+                                   [mask_for_background ? HAS_MASK : NO_MASK];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::renderPassMaskProgramAA::initialize");
+    program->Initialize(
+        output_surface_->context_provider(), precision,
+        sampler, blend_mode, mask_for_background);
+  }
+  return program;
+}
+
+const GLRenderer::RenderPassColorMatrixProgram*
+GLRenderer::GetRenderPassColorMatrixProgram(TexCoordPrecision precision,
+                                            BlendMode blend_mode) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  DCHECK_GE(blend_mode, 0);
+  DCHECK_LE(blend_mode, LAST_BLEND_MODE);
+  RenderPassColorMatrixProgram* program =
+      &render_pass_color_matrix_program_[precision][blend_mode];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::renderPassColorMatrixProgram::initialize");
+    program->Initialize(output_surface_->context_provider(), precision,
+                        SAMPLER_TYPE_2D, blend_mode);
+  }
+  return program;
+}
+
+const GLRenderer::RenderPassColorMatrixProgramAA*
+GLRenderer::GetRenderPassColorMatrixProgramAA(TexCoordPrecision precision,
+                                              BlendMode blend_mode) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  DCHECK_GE(blend_mode, 0);
+  DCHECK_LE(blend_mode, LAST_BLEND_MODE);
+  RenderPassColorMatrixProgramAA* program =
+      &render_pass_color_matrix_program_aa_[precision][blend_mode];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc",
+                 "GLRenderer::renderPassColorMatrixProgramAA::initialize");
+    program->Initialize(output_surface_->context_provider(), precision,
+                        SAMPLER_TYPE_2D, blend_mode);
+  }
+  return program;
+}
+
+const GLRenderer::RenderPassMaskColorMatrixProgram*
+GLRenderer::GetRenderPassMaskColorMatrixProgram(
+    TexCoordPrecision precision,
+    SamplerType sampler,
+    BlendMode blend_mode,
+    bool mask_for_background) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  DCHECK_GE(sampler, 0);
+  DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
+  DCHECK_GE(blend_mode, 0);
+  DCHECK_LE(blend_mode, LAST_BLEND_MODE);
+  RenderPassMaskColorMatrixProgram* program =
+      &render_pass_mask_color_matrix_program_[precision][sampler][blend_mode]
+          [mask_for_background ? HAS_MASK : NO_MASK];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc",
+                 "GLRenderer::renderPassMaskColorMatrixProgram::initialize");
+    program->Initialize(
+        output_surface_->context_provider(), precision,
+        sampler, blend_mode, mask_for_background);
+  }
+  return program;
+}
+
+const GLRenderer::RenderPassMaskColorMatrixProgramAA*
+GLRenderer::GetRenderPassMaskColorMatrixProgramAA(
+    TexCoordPrecision precision,
+    SamplerType sampler,
+    BlendMode blend_mode,
+    bool mask_for_background) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  DCHECK_GE(sampler, 0);
+  DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
+  DCHECK_GE(blend_mode, 0);
+  DCHECK_LE(blend_mode, LAST_BLEND_MODE);
+  RenderPassMaskColorMatrixProgramAA* program =
+      &render_pass_mask_color_matrix_program_aa_[precision][sampler][blend_mode]
+          [mask_for_background ? HAS_MASK : NO_MASK];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc",
+                 "GLRenderer::renderPassMaskColorMatrixProgramAA::initialize");
+    program->Initialize(
+        output_surface_->context_provider(), precision,
+        sampler, blend_mode, mask_for_background);
+  }
+  return program;
+}
+
+const GLRenderer::TileProgram* GLRenderer::GetTileProgram(
+    TexCoordPrecision precision,
+    SamplerType sampler) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  DCHECK_GE(sampler, 0);
+  DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
+  TileProgram* program = &tile_program_[precision][sampler];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::tileProgram::initialize");
+    program->Initialize(
+        output_surface_->context_provider(), precision, sampler);
+  }
+  return program;
+}
+
+const GLRenderer::TileProgramOpaque* GLRenderer::GetTileProgramOpaque(
+    TexCoordPrecision precision,
+    SamplerType sampler) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  DCHECK_GE(sampler, 0);
+  DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
+  TileProgramOpaque* program = &tile_program_opaque_[precision][sampler];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::tileProgramOpaque::initialize");
+    program->Initialize(
+        output_surface_->context_provider(), precision, sampler);
+  }
+  return program;
+}
+
+const GLRenderer::TileProgramAA* GLRenderer::GetTileProgramAA(
+    TexCoordPrecision precision,
+    SamplerType sampler) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  DCHECK_GE(sampler, 0);
+  DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
+  TileProgramAA* program = &tile_program_aa_[precision][sampler];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::tileProgramAA::initialize");
+    program->Initialize(
+        output_surface_->context_provider(), precision, sampler);
+  }
+  return program;
+}
+
+const GLRenderer::TileProgramSwizzle* GLRenderer::GetTileProgramSwizzle(
+    TexCoordPrecision precision,
+    SamplerType sampler) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  DCHECK_GE(sampler, 0);
+  DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
+  TileProgramSwizzle* program = &tile_program_swizzle_[precision][sampler];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::tileProgramSwizzle::initialize");
+    program->Initialize(
+        output_surface_->context_provider(), precision, sampler);
+  }
+  return program;
+}
+
+const GLRenderer::TileProgramSwizzleOpaque*
+GLRenderer::GetTileProgramSwizzleOpaque(TexCoordPrecision precision,
+                                        SamplerType sampler) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  DCHECK_GE(sampler, 0);
+  DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
+  TileProgramSwizzleOpaque* program =
+      &tile_program_swizzle_opaque_[precision][sampler];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::tileProgramSwizzleOpaque::initialize");
+    program->Initialize(
+        output_surface_->context_provider(), precision, sampler);
+  }
+  return program;
+}
+
+const GLRenderer::TileProgramSwizzleAA* GLRenderer::GetTileProgramSwizzleAA(
+    TexCoordPrecision precision,
+    SamplerType sampler) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  DCHECK_GE(sampler, 0);
+  DCHECK_LE(sampler, LAST_SAMPLER_TYPE);
+  TileProgramSwizzleAA* program = &tile_program_swizzle_aa_[precision][sampler];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::tileProgramSwizzleAA::initialize");
+    program->Initialize(
+        output_surface_->context_provider(), precision, sampler);
+  }
+  return program;
+}
+
+const GLRenderer::TextureProgram* GLRenderer::GetTextureProgram(
+    TexCoordPrecision precision) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  TextureProgram* program = &texture_program_[precision];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::textureProgram::initialize");
+    program->Initialize(output_surface_->context_provider(), precision,
+                        SAMPLER_TYPE_2D);
+  }
+  return program;
+}
+
+const GLRenderer::NonPremultipliedTextureProgram*
+GLRenderer::GetNonPremultipliedTextureProgram(TexCoordPrecision precision) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  NonPremultipliedTextureProgram* program =
+      &nonpremultiplied_texture_program_[precision];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc",
+                 "GLRenderer::NonPremultipliedTextureProgram::Initialize");
+    program->Initialize(output_surface_->context_provider(), precision,
+                        SAMPLER_TYPE_2D);
+  }
+  return program;
+}
+
+const GLRenderer::TextureBackgroundProgram*
+GLRenderer::GetTextureBackgroundProgram(TexCoordPrecision precision) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  TextureBackgroundProgram* program = &texture_background_program_[precision];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::textureProgram::initialize");
+    program->Initialize(output_surface_->context_provider(), precision,
+                        SAMPLER_TYPE_2D);
+  }
+  return program;
+}
+
+const GLRenderer::NonPremultipliedTextureBackgroundProgram*
+GLRenderer::GetNonPremultipliedTextureBackgroundProgram(
+    TexCoordPrecision precision) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  NonPremultipliedTextureBackgroundProgram* program =
+      &nonpremultiplied_texture_background_program_[precision];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc",
+                 "GLRenderer::NonPremultipliedTextureProgram::Initialize");
+    program->Initialize(output_surface_->context_provider(), precision,
+                        SAMPLER_TYPE_2D);
+  }
+  return program;
+}
+
+const GLRenderer::TextureProgram* GLRenderer::GetTextureIOSurfaceProgram(
+    TexCoordPrecision precision) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  TextureProgram* program = &texture_io_surface_program_[precision];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::textureIOSurfaceProgram::initialize");
+    program->Initialize(output_surface_->context_provider(), precision,
+                        SAMPLER_TYPE_2D_RECT);
+  }
+  return program;
+}
+
+const GLRenderer::VideoYUVProgram* GLRenderer::GetVideoYUVProgram(
+    TexCoordPrecision precision) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  VideoYUVProgram* program = &video_yuv_program_[precision];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::videoYUVProgram::initialize");
+    program->Initialize(output_surface_->context_provider(), precision,
+                        SAMPLER_TYPE_2D);
+  }
+  return program;
+}
+
+const GLRenderer::VideoYUVAProgram* GLRenderer::GetVideoYUVAProgram(
+    TexCoordPrecision precision) {
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  VideoYUVAProgram* program = &video_yuva_program_[precision];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::videoYUVAProgram::initialize");
+    program->Initialize(output_surface_->context_provider(), precision,
+                        SAMPLER_TYPE_2D);
+  }
+  return program;
+}
+
+const GLRenderer::VideoStreamTextureProgram*
+GLRenderer::GetVideoStreamTextureProgram(TexCoordPrecision precision) {
+  if (!Capabilities().using_egl_image)
+    return NULL;
+  DCHECK_GE(precision, 0);
+  DCHECK_LE(precision, LAST_TEX_COORD_PRECISION);
+  VideoStreamTextureProgram* program =
+      &video_stream_texture_program_[precision];
+  if (!program->initialized()) {
+    TRACE_EVENT0("cc", "GLRenderer::streamTextureProgram::initialize");
+    program->Initialize(output_surface_->context_provider(), precision,
+                        SAMPLER_TYPE_EXTERNAL_OES);
+  }
+  return program;
+}
+
+void GLRenderer::CleanupSharedObjects() {
+  shared_geometry_ = nullptr;
+
+  for (int i = 0; i <= LAST_TEX_COORD_PRECISION; ++i) {
+    for (int j = 0; j <= LAST_SAMPLER_TYPE; ++j) {
+      tile_program_[i][j].Cleanup(gl_);
+      tile_program_opaque_[i][j].Cleanup(gl_);
+      tile_program_swizzle_[i][j].Cleanup(gl_);
+      tile_program_swizzle_opaque_[i][j].Cleanup(gl_);
+      tile_program_aa_[i][j].Cleanup(gl_);
+      tile_program_swizzle_aa_[i][j].Cleanup(gl_);
+
+      for (int k = 0; k <= LAST_BLEND_MODE; k++) {
+        for (int l = 0; l <= LAST_MASK_VALUE; ++l) {
+          render_pass_mask_program_[i][j][k][l].Cleanup(gl_);
+          render_pass_mask_program_aa_[i][j][k][l].Cleanup(gl_);
+          render_pass_mask_color_matrix_program_aa_[i][j][k][l].Cleanup(gl_);
+          render_pass_mask_color_matrix_program_[i][j][k][l].Cleanup(gl_);
+        }
+      }
+    }
+    for (int j = 0; j <= LAST_BLEND_MODE; j++) {
+      render_pass_program_[i][j].Cleanup(gl_);
+      render_pass_program_aa_[i][j].Cleanup(gl_);
+      render_pass_color_matrix_program_[i][j].Cleanup(gl_);
+      render_pass_color_matrix_program_aa_[i][j].Cleanup(gl_);
+    }
+
+    texture_program_[i].Cleanup(gl_);
+    nonpremultiplied_texture_program_[i].Cleanup(gl_);
+    texture_background_program_[i].Cleanup(gl_);
+    nonpremultiplied_texture_background_program_[i].Cleanup(gl_);
+    texture_io_surface_program_[i].Cleanup(gl_);
+
+    video_yuv_program_[i].Cleanup(gl_);
+    video_yuva_program_[i].Cleanup(gl_);
+    video_stream_texture_program_[i].Cleanup(gl_);
+  }
+
+  tile_checkerboard_program_.Cleanup(gl_);
+
+  debug_border_program_.Cleanup(gl_);
+  solid_color_program_.Cleanup(gl_);
+  solid_color_program_aa_.Cleanup(gl_);
+
+  if (offscreen_framebuffer_id_)
+    GLC(gl_, gl_->DeleteFramebuffers(1, &offscreen_framebuffer_id_));
+
+  if (on_demand_tile_raster_resource_id_)
+    resource_provider_->DeleteResource(on_demand_tile_raster_resource_id_);
+
+  ReleaseRenderPassTextures();
+}
+
+void GLRenderer::ReinitializeGLState() {
+  is_scissor_enabled_ = false;
+  scissor_rect_needs_reset_ = true;
+  stencil_shadow_ = false;
+  blend_shadow_ = true;
+  program_shadow_ = 0;
+
+  RestoreGLState();
+}
+
+void GLRenderer::RestoreGLState() {
+  // This restores the current GLRenderer state to the GL context.
+  bound_geometry_ = NO_BINDING;
+  PrepareGeometry(SHARED_BINDING);
+
+  GLC(gl_, gl_->Disable(GL_DEPTH_TEST));
+  GLC(gl_, gl_->Disable(GL_CULL_FACE));
+  GLC(gl_, gl_->ColorMask(true, true, true, true));
+  GLC(gl_, gl_->BlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA));
+  GLC(gl_, gl_->ActiveTexture(GL_TEXTURE0));
+
+  if (program_shadow_)
+    gl_->UseProgram(program_shadow_);
+
+  if (stencil_shadow_)
+    GLC(gl_, gl_->Enable(GL_STENCIL_TEST));
+  else
+    GLC(gl_, gl_->Disable(GL_STENCIL_TEST));
+
+  if (blend_shadow_)
+    GLC(gl_, gl_->Enable(GL_BLEND));
+  else
+    GLC(gl_, gl_->Disable(GL_BLEND));
+
+  if (is_scissor_enabled_) {
+    GLC(gl_, gl_->Enable(GL_SCISSOR_TEST));
+    GLC(gl_,
+        gl_->Scissor(scissor_rect_.x(),
+                     scissor_rect_.y(),
+                     scissor_rect_.width(),
+                     scissor_rect_.height()));
+  } else {
+    GLC(gl_, gl_->Disable(GL_SCISSOR_TEST));
+  }
+}
+
+void GLRenderer::RestoreFramebuffer(DrawingFrame* frame) {
+  UseRenderPass(frame, frame->current_render_pass);
+}
+
+bool GLRenderer::IsContextLost() {
+  return output_surface_->context_provider()->IsContextLost();
+}
+
+void GLRenderer::ScheduleOverlays(DrawingFrame* frame) {
+  if (!frame->overlay_list.size())
+    return;
+
+  ResourceProvider::ResourceIdArray resources;
+  OverlayCandidateList& overlays = frame->overlay_list;
+  OverlayCandidateList::iterator it;
+  for (it = overlays.begin(); it != overlays.end(); ++it) {
+    const OverlayCandidate& overlay = *it;
+    // Skip primary plane.
+    if (overlay.plane_z_order == 0)
+      continue;
+
+    pending_overlay_resources_.push_back(
+        make_scoped_ptr(new ResourceProvider::ScopedReadLockGL(
+            resource_provider_, overlay.resource_id)));
+
+    context_support_->ScheduleOverlayPlane(
+        overlay.plane_z_order,
+        overlay.transform,
+        pending_overlay_resources_.back()->texture_id(),
+        overlay.display_rect,
+        overlay.uv_rect);
+  }
+}
+
+}  // namespace cc