Clean up GLSurfaceCGL

content/common/gpu/image_transport_surface_fbo_mac.cc

 // Copyright (c) 2012 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 "content/common/gpu/image_transport_surface.h"
+#include "content/common/gpu/image_transport_surface_fbo_mac.h"
 
-#include "base/mac/scoped_cftyperef.h"
-#include "base/memory/scoped_ptr.h"
-#include "content/common/gpu/gpu_command_buffer_stub.h"
 #include "content/common/gpu/gpu_messages.h"
+#include "content/common/gpu/image_transport_surface_iosurface_mac.h"
 #include "ui/gfx/native_widget_types.h"
-#include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_implementation.h"
-#include "ui/gl/gl_surface_cgl.h"
 #include "ui/gl/gl_surface_osmesa.h"
 
-// Note that this must be included after gl_bindings.h to avoid conflicts.
-#include <OpenGL/CGLIOSurface.h>
+namespace content {
 
-namespace content {
-namespace {
-
-// IOSurface dimensions will be rounded up to a multiple of this value in order
-// to reduce memory thrashing during resize. This must be a power of 2.
-const uint32 kIOSurfaceDimensionRoundup = 64;
-
-int RoundUpSurfaceDimension(int number) {
-  DCHECK(number >= 0);
-  // Cast into unsigned space for portable bitwise ops.
-  uint32 unsigned_number = static_cast<uint32>(number);
-  uint32 roundup_sub_1 = kIOSurfaceDimensionRoundup - 1;
-  unsigned_number = (unsigned_number + roundup_sub_1) & ~roundup_sub_1;
-  return static_cast<int>(unsigned_number);
-}
-
-// We are backed by an offscreen surface for the purposes of creating
-// a context, but use FBOs to render to texture backed IOSurface
-class IOSurfaceImageTransportSurface
-    : public gfx::NoOpGLSurfaceCGL,
-      public ImageTransportSurface,
-      public GpuCommandBufferStub::DestructionObserver {
- public:
-  IOSurfaceImageTransportSurface(GpuChannelManager* manager,
-                                 GpuCommandBufferStub* stub,
-                                 gfx::PluginWindowHandle handle);
-
-  // GLSurface implementation
-  virtual bool Initialize() OVERRIDE;
-  virtual void Destroy() OVERRIDE;
-  virtual bool DeferDraws() OVERRIDE;
-  virtual bool IsOffscreen() OVERRIDE;
-  virtual bool SwapBuffers() OVERRIDE;
-  virtual bool PostSubBuffer(int x, int y, int width, int height) OVERRIDE;
-  virtual bool SupportsPostSubBuffer() OVERRIDE;
-  virtual gfx::Size GetSize() OVERRIDE;
-  virtual bool OnMakeCurrent(gfx::GLContext* context) OVERRIDE;
-  virtual unsigned int GetBackingFrameBufferObject() OVERRIDE;
-  virtual bool SetBackbufferAllocation(bool allocated) OVERRIDE;
-  virtual void SetFrontbufferAllocation(bool allocated) OVERRIDE;
-
- protected:
-  // ImageTransportSurface implementation
-  virtual void OnBufferPresented(
-      const AcceleratedSurfaceMsg_BufferPresented_Params& params) OVERRIDE;
-  virtual void OnResize(gfx::Size size, float scale_factor) OVERRIDE;
-  virtual void SetLatencyInfo(
-      const std::vector<ui::LatencyInfo>&) OVERRIDE;
-  virtual void WakeUpGpu() OVERRIDE;
-
-  // GpuCommandBufferStub::DestructionObserver implementation.
-  virtual void OnWillDestroyStub() OVERRIDE;
-
- private:
-  virtual ~IOSurfaceImageTransportSurface() OVERRIDE;
-
-  void AdjustBufferAllocation();
-  void UnrefIOSurface();
-  void CreateIOSurface();
-
-  // Tracks the current buffer allocation state.
-  bool backbuffer_suggested_allocation_;
-  bool frontbuffer_suggested_allocation_;
-
-  uint32 fbo_id_;
-  GLuint texture_id_;
-  GLuint depth_stencil_renderbuffer_id_;
-
-  base::ScopedCFTypeRef<IOSurfaceRef> io_surface_;
-
-  // The id of |io_surface_| or 0 if that's NULL.
-  uint64 io_surface_handle_;
-
-  // Weak pointer to the context that this was last made current to.
-  gfx::GLContext* context_;
-
-  gfx::Size size_;
-  gfx::Size rounded_size_;
-  float scale_factor_;
-
-  // Whether or not we've successfully made the surface current once.
-  bool made_current_;
-
-  // Whether a SwapBuffers is pending.
-  bool is_swap_buffers_pending_;
-
-  // Whether we unscheduled command buffer because of pending SwapBuffers.
-  bool did_unschedule_;
-
-  std::vector<ui::LatencyInfo> latency_info_;
-
-  scoped_ptr<ImageTransportHelper> helper_;
-
-  DISALLOW_COPY_AND_ASSIGN(IOSurfaceImageTransportSurface);
-};
-
-void AddBooleanValue(CFMutableDictionaryRef dictionary,
-                     const CFStringRef key,
-                     bool value) {
-  CFDictionaryAddValue(dictionary, key,
-                       (value ? kCFBooleanTrue : kCFBooleanFalse));
-}
-
-void AddIntegerValue(CFMutableDictionaryRef dictionary,
-                     const CFStringRef key,
-                     int32 value) {
-  base::ScopedCFTypeRef<CFNumberRef> number(
-      CFNumberCreate(NULL, kCFNumberSInt32Type, &value));
-  CFDictionaryAddValue(dictionary, key, number.get());
-}
-
-IOSurfaceImageTransportSurface::IOSurfaceImageTransportSurface(
+ImageTransportSurfaceFBO::ImageTransportSurfaceFBO(
+    StorageProvider* storage_provider,
     GpuChannelManager* manager,
     GpuCommandBufferStub* stub,
     gfx::PluginWindowHandle handle)
-    : gfx::NoOpGLSurfaceCGL(gfx::Size(1, 1)),
+    : storage_provider_(storage_provider),
       backbuffer_suggested_allocation_(true),
       frontbuffer_suggested_allocation_(true),
       fbo_id_(0),
       texture_id_(0),
       depth_stencil_renderbuffer_id_(0),
-      io_surface_handle_(0),
+      has_complete_framebuffer_(false),
       context_(NULL),
       scale_factor_(1.f),
       made_current_(false),
       is_swap_buffers_pending_(false),
       did_unschedule_(false) {
   helper_.reset(new ImageTransportHelper(this, manager, stub, handle));
 }
 
-IOSurfaceImageTransportSurface::~IOSurfaceImageTransportSurface() {
+ImageTransportSurfaceFBO::~ImageTransportSurfaceFBO() {
 }
 
-bool IOSurfaceImageTransportSurface::Initialize() {
+bool ImageTransportSurfaceFBO::Initialize() {
   // Only support IOSurfaces if the GL implementation is the native desktop GL.
   // IO surfaces will not work with, for example, OSMesa software renderer
   // GL contexts.
   if (gfx::GetGLImplementation() != gfx::kGLImplementationDesktopGL &&
       gfx::GetGLImplementation() != gfx::kGLImplementationAppleGL)
     return false;
 
   if (!helper_->Initialize())
     return false;
 
-  if (!NoOpGLSurfaceCGL::Initialize()) {
-    helper_->Destroy();
-    return false;
-  }
-
   helper_->stub()->AddDestructionObserver(this);
   return true;
 }
 
-void IOSurfaceImageTransportSurface::Destroy() {
-  UnrefIOSurface();
+void ImageTransportSurfaceFBO::Destroy() {
+  DestroyFramebuffer();
 
   helper_->Destroy();
-  NoOpGLSurfaceCGL::Destroy();
 }
 
-bool IOSurfaceImageTransportSurface::DeferDraws() {
+bool ImageTransportSurfaceFBO::DeferDraws() {
   // The command buffer hit a draw/clear command that could clobber the
   // IOSurface in use by an earlier SwapBuffers. If a Swap is pending, abort
   // processing of the command by returning true and unschedule until the Swap
   // Ack arrives.
   if(did_unschedule_)
     return true;  // Still unscheduled, so just return true.
   if (is_swap_buffers_pending_) {
     did_unschedule_ = true;
     helper_->SetScheduled(false);
     return true;
   }
   return false;
 }
 
-bool IOSurfaceImageTransportSurface::IsOffscreen() {
+bool ImageTransportSurfaceFBO::IsOffscreen() {
   return false;
 }
 
-bool IOSurfaceImageTransportSurface::OnMakeCurrent(gfx::GLContext* context) {
+bool ImageTransportSurfaceFBO::OnMakeCurrent(gfx::GLContext* context) {
   context_ = context;
 
   if (made_current_)
     return true;
 
   OnResize(gfx::Size(1, 1), 1.f);
 
   made_current_ = true;
   return true;
 }
 
-unsigned int IOSurfaceImageTransportSurface::GetBackingFrameBufferObject() {
+unsigned int ImageTransportSurfaceFBO::GetBackingFrameBufferObject() {
   return fbo_id_;
 }
 
-bool IOSurfaceImageTransportSurface::SetBackbufferAllocation(bool allocation) {
+bool ImageTransportSurfaceFBO::SetBackbufferAllocation(bool allocation) {
   if (backbuffer_suggested_allocation_ == allocation)
     return true;
   backbuffer_suggested_allocation_ = allocation;
   AdjustBufferAllocation();
   return true;
 }
 
-void IOSurfaceImageTransportSurface::SetFrontbufferAllocation(bool allocation) {
+void ImageTransportSurfaceFBO::SetFrontbufferAllocation(bool allocation) {
   if (frontbuffer_suggested_allocation_ == allocation)
     return;
   frontbuffer_suggested_allocation_ = allocation;
   AdjustBufferAllocation();
 }
 
-void IOSurfaceImageTransportSurface::AdjustBufferAllocation() {
+void ImageTransportSurfaceFBO::AdjustBufferAllocation() {
   // On mac, the frontbuffer and backbuffer are the same buffer. The buffer is
   // free'd when both the browser and gpu processes have Unref'd the IOSurface.
   if (!backbuffer_suggested_allocation_ &&
       !frontbuffer_suggested_allocation_ &&
-      io_surface_.get()) {
-    UnrefIOSurface();
+      has_complete_framebuffer_) {
+    DestroyFramebuffer();
     helper_->Suspend();
-  } else if (backbuffer_suggested_allocation_ && !io_surface_) {
-    CreateIOSurface();
+  } else if (backbuffer_suggested_allocation_ && !has_complete_framebuffer_) {
+    CreateFramebuffer();
   }
 }
 
-bool IOSurfaceImageTransportSurface::SwapBuffers() {
+bool ImageTransportSurfaceFBO::SwapBuffers() {
   DCHECK(backbuffer_suggested_allocation_);
   if (!frontbuffer_suggested_allocation_)
     return true;
   glFlush();
 
   GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params params;
-  params.surface_handle = io_surface_handle_;
+  params.surface_handle = storage_provider_->GetSurfaceHandle();
   params.size = GetSize();
   params.scale_factor = scale_factor_;
   params.latency_info.swap(latency_info_);
   helper_->SendAcceleratedSurfaceBuffersSwapped(params);
 
   DCHECK(!is_swap_buffers_pending_);
   is_swap_buffers_pending_ = true;
   return true;
 }
 
-bool IOSurfaceImageTransportSurface::PostSubBuffer(
+bool ImageTransportSurfaceFBO::PostSubBuffer(
     int x, int y, int width, int height) {
   DCHECK(backbuffer_suggested_allocation_);
   if (!frontbuffer_suggested_allocation_)
     return true;
   glFlush();
 
   GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params params;
-  params.surface_handle = io_surface_handle_;
+  params.surface_handle = storage_provider_->GetSurfaceHandle();
   params.x = x;
   params.y = y;
   params.width = width;
   params.height = height;
   params.surface_size = GetSize();
   params.surface_scale_factor = scale_factor_;
   params.latency_info.swap(latency_info_);
   helper_->SendAcceleratedSurfacePostSubBuffer(params);
 
   DCHECK(!is_swap_buffers_pending_);
   is_swap_buffers_pending_ = true;
   return true;
 }
 
-bool IOSurfaceImageTransportSurface::SupportsPostSubBuffer() {
+bool ImageTransportSurfaceFBO::SupportsPostSubBuffer() {
   return true;
 }
 
-gfx::Size IOSurfaceImageTransportSurface::GetSize() {
+gfx::Size ImageTransportSurfaceFBO::GetSize() {
   return size_;
 }
 
-void IOSurfaceImageTransportSurface::OnBufferPresented(
+void* ImageTransportSurfaceFBO::GetHandle() {
+  return NULL;
+}
+
+void* ImageTransportSurfaceFBO::GetDisplay() {
+  return NULL;
+}
+
+void ImageTransportSurfaceFBO::OnBufferPresented(
     const AcceleratedSurfaceMsg_BufferPresented_Params& params) {
   DCHECK(is_swap_buffers_pending_);
 
   context_->share_group()->SetRendererID(params.renderer_id);
   is_swap_buffers_pending_ = false;
   if (did_unschedule_) {
     did_unschedule_ = false;
     helper_->SetScheduled(true);
   }
 }
 
-void IOSurfaceImageTransportSurface::OnResize(gfx::Size size,
-                                              float scale_factor) {
+void ImageTransportSurfaceFBO::OnResize(gfx::Size size,
+                                        float scale_factor) {
   // This trace event is used in gpu_feature_browsertest.cc - the test will need
   // to be updated if this event is changed or moved.
-  TRACE_EVENT2("gpu", "IOSurfaceImageTransportSurface::OnResize",
+  TRACE_EVENT2("gpu", "ImageTransportSurfaceFBO::OnResize",
                "old_width", size_.width(), "new_width", size.width());
   // Caching |context_| from OnMakeCurrent. It should still be current.
   DCHECK(context_->IsCurrent(this));
 
   size_ = size;
   scale_factor_ = scale_factor;
 
-  CreateIOSurface();
+  CreateFramebuffer();
 }
 
-void IOSurfaceImageTransportSurface::SetLatencyInfo(
+void ImageTransportSurfaceFBO::SetLatencyInfo(
     const std::vector<ui::LatencyInfo>& latency_info) {
   for (size_t i = 0; i < latency_info.size(); i++)
     latency_info_.push_back(latency_info[i]);
 }
 
-void IOSurfaceImageTransportSurface::WakeUpGpu() {
+void ImageTransportSurfaceFBO::WakeUpGpu() {
   NOTIMPLEMENTED();
 }
 
-void IOSurfaceImageTransportSurface::OnWillDestroyStub() {
+void ImageTransportSurfaceFBO::OnWillDestroyStub() {
   helper_->stub()->RemoveDestructionObserver(this);
   Destroy();
 }
 
-void IOSurfaceImageTransportSurface::UnrefIOSurface() {
+void ImageTransportSurfaceFBO::DestroyFramebuffer() {
   // If we have resources to destroy, then make sure that we have a current
   // context which we can use to delete the resources.
   if (context_ || fbo_id_ || texture_id_ || depth_stencil_renderbuffer_id_) {
     DCHECK(gfx::GLContext::GetCurrent() == context_);
     DCHECK(context_->IsCurrent(this));
     DCHECK(CGLGetCurrentContext());
   }
 
   if (fbo_id_) {
     glDeleteFramebuffersEXT(1, &fbo_id_);
     fbo_id_ = 0;
   }
 
   if (texture_id_) {
     glDeleteTextures(1, &texture_id_);
     texture_id_ = 0;
   }
 
   if (depth_stencil_renderbuffer_id_) {
     glDeleteRenderbuffersEXT(1, &depth_stencil_renderbuffer_id_);
     depth_stencil_renderbuffer_id_ = 0;
   }
 
-  io_surface_.reset();
-  io_surface_handle_ = 0;
+  storage_provider_->FreeColorBufferStorage();
+
+  has_complete_framebuffer_ = false;
 }
 
-void IOSurfaceImageTransportSurface::CreateIOSurface() {
-  gfx::Size new_rounded_size(RoundUpSurfaceDimension(size_.width()),
-                             RoundUpSurfaceDimension(size_.height()));
+void ImageTransportSurfaceFBO::CreateFramebuffer() {
+  gfx::Size new_rounded_size = storage_provider_->GetRoundedSize(size_);
 
   // Only recreate surface when the rounded up size has changed.
-  if (io_surface_.get() && new_rounded_size == rounded_size_)
+  if (has_complete_framebuffer_ && new_rounded_size == rounded_size_)
     return;
 
   // This trace event is used in gpu_feature_browsertest.cc - the test will need
   // to be updated if this event is changed or moved.
-  TRACE_EVENT2("gpu", "IOSurfaceImageTransportSurface::CreateIOSurface",
+  TRACE_EVENT2("gpu", "ImageTransportSurfaceFBO::CreateFramebuffer",
                "width", new_rounded_size.width(),
                "height", new_rounded_size.height());
 
   rounded_size_ = new_rounded_size;
 
+  // GL_TEXTURE_RECTANGLE_ARB is the best supported render target on
+  // Mac OS X and is required for IOSurface interoperability.
   GLint previous_texture_id = 0;
   glGetIntegerv(GL_TEXTURE_BINDING_RECTANGLE_ARB, &previous_texture_id);
 
   // Free the old IO Surface first to reduce memory fragmentation.
-  UnrefIOSurface();
+  DestroyFramebuffer();
 
   glGenFramebuffersEXT(1, &fbo_id_);
   glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo_id_);
 
   glGenTextures(1, &texture_id_);
 
-  // GL_TEXTURE_RECTANGLE_ARB is the best supported render target on
-  // Mac OS X and is required for IOSurface interoperability.
-  GLenum target = GL_TEXTURE_RECTANGLE_ARB;
-  glBindTexture(target, texture_id_);
-  glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-  glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-  glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-  glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+  glBindTexture(GL_TEXTURE_RECTANGLE_ARB, texture_id_);
+  glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,
+                  GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,
+                  GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 
   glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
                             GL_COLOR_ATTACHMENT0_EXT,
-                            target,
+                            GL_TEXTURE_RECTANGLE_ARB,
                             texture_id_,
                             0);
 
-
   // Search through the provided attributes; if the caller has
   // requested a stencil buffer, try to get one.
 
   int32 stencil_bits =
       helper_->stub()->GetRequestedAttribute(EGL_STENCIL_SIZE);
   if (stencil_bits > 0) {
     // Create and bind the stencil buffer
     bool has_packed_depth_stencil =
          GLSurface::ExtensionsContain(
              reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)),
@@ skipping 10 matching lines @@
                                   GL_RENDERBUFFER_EXT,
                                   depth_stencil_renderbuffer_id_);
     }
 
     // If we asked for stencil but the extension isn't present,
     // it's OK to silently fail; subsequent code will/must check
     // for the presence of a stencil buffer before attempting to
     // do stencil-based operations.
   }
 
-  // Allocate a new IOSurface, which is the GPU resource that can be
-  // shared across processes.
-  base::ScopedCFTypeRef<CFMutableDictionaryRef> properties;
-  properties.reset(CFDictionaryCreateMutable(kCFAllocatorDefault,
-                                             0,
-                                             &kCFTypeDictionaryKeyCallBacks,
-                                             &kCFTypeDictionaryValueCallBacks));
-  AddIntegerValue(properties,
-                  kIOSurfaceWidth,
-                  rounded_size_.width());
-  AddIntegerValue(properties,
-                  kIOSurfaceHeight,
-                  rounded_size_.height());
-  AddIntegerValue(properties,
-                  kIOSurfaceBytesPerElement, 4);
-  AddBooleanValue(properties,
-                  kIOSurfaceIsGlobal, true);
-  // I believe we should be able to unreference the IOSurfaces without
-  // synchronizing with the browser process because they are
-  // ultimately reference counted by the operating system.
-  io_surface_.reset(IOSurfaceCreate(properties));
-  io_surface_handle_ = IOSurfaceGetID(io_surface_);
-
-  // Don't think we need to identify a plane.
-  GLuint plane = 0;
-  CGLError cglerror =
-      CGLTexImageIOSurface2D(
-          static_cast<CGLContextObj>(context_->GetHandle()),
-          target,
-          GL_RGBA,
-          rounded_size_.width(),
-          rounded_size_.height(),
-          GL_BGRA,
-          GL_UNSIGNED_INT_8_8_8_8_REV,
-          io_surface_.get(),
-          plane);
-  if (cglerror != kCGLNoError) {
-    UnrefIOSurface();
+  bool allocated_color_buffer = storage_provider_->AllocateColorBufferStorage(
+      static_cast<CGLContextObj>(context_->GetHandle()),
+      rounded_size_);
+  if (!allocated_color_buffer) {
+    DLOG(ERROR) << "Failed to allocate color buffer storage.";
+    DestroyFramebuffer();
     return;
   }
 
-  glFlush();
-
   GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
   if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
     DLOG(ERROR) << "Framebuffer was incomplete: " << status;
-    UnrefIOSurface();
+    DestroyFramebuffer();
     return;
   }
 
-  glBindTexture(target, previous_texture_id);
+  has_complete_framebuffer_ = true;
+
+  glBindTexture(GL_TEXTURE_RECTANGLE_ARB, previous_texture_id);
   // The FBO remains bound for this GL context.
 }
 
-// A subclass of GLSurfaceOSMesa that doesn't print an error message when
-// SwapBuffers() is called.
-class DRTSurfaceOSMesa : public gfx::GLSurfaceOSMesa {
- public:
-  // Size doesn't matter, the surface is resized to the right size later.
-  DRTSurfaceOSMesa() : GLSurfaceOSMesa(GL_RGBA, gfx::Size(1, 1)) {}
-
-  // Implement a subset of GLSurface.
-  virtual bool SwapBuffers() OVERRIDE;
-
- private:
-  virtual ~DRTSurfaceOSMesa() {}
-  DISALLOW_COPY_AND_ASSIGN(DRTSurfaceOSMesa);
-};
-
-bool DRTSurfaceOSMesa::SwapBuffers() {
-  return true;
-}
-
-bool g_allow_os_mesa = false;
-
-}  // namespace
-
-// static
-scoped_refptr<gfx::GLSurface> ImageTransportSurface::CreateNativeSurface(
-    GpuChannelManager* manager,
-    GpuCommandBufferStub* stub,
-    const gfx::GLSurfaceHandle& surface_handle) {
-  DCHECK(surface_handle.transport_type == gfx::NATIVE_DIRECT ||
-         surface_handle.transport_type == gfx::NATIVE_TRANSPORT);
-
-  switch (gfx::GetGLImplementation()) {
-    case gfx::kGLImplementationDesktopGL:
-    case gfx::kGLImplementationAppleGL:
-      return scoped_refptr<gfx::GLSurface>(new IOSurfaceImageTransportSurface(
-          manager, stub, surface_handle.handle));
-
-    default:
-      // Content shell in DRT mode spins up a gpu process which needs an
-      // image transport surface, but that surface isn't used to read pixel
-      // baselines. So this is mostly a dummy surface.
-      if (!g_allow_os_mesa) {
-        NOTREACHED();
-        return scoped_refptr<gfx::GLSurface>();
-      }
-      scoped_refptr<gfx::GLSurface> surface(new DRTSurfaceOSMesa());
-      if (!surface.get() || !surface->Initialize())
-        return surface;
-      return scoped_refptr<gfx::GLSurface>(new PassThroughImageTransportSurface(
-          manager, stub, surface.get()));
-  }
-}
-
-// static
-void ImageTransportSurface::SetAllowOSMesaForTesting(bool allow) {
-  g_allow_os_mesa = allow;
-}
-
 }  // namespace content