Reducing code duplication between WGC3D(InProcess)CommandBufferImpl

webkit/common/gpu/webgraphicscontext3d_impl.cc

Index: webkit/common/gpu/webgraphicscontext3d_impl.cc
diff --git a/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc b/webkit/common/gpu/webgraphicscontext3d_impl.cc
similarity index 59%
copy from content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
copy to webkit/common/gpu/webgraphicscontext3d_impl.cc
index 3638ecfde7a4317558a8ad4872df6cd01d884fa4..a1da8230e105fdc0b9dfe44194033019828574d1 100644
--- a/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
+++ b/webkit/common/gpu/webgraphicscontext3d_impl.cc
@@ -2,69 +2,26 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
-
-#include "third_party/khronos/GLES2/gl2.h"
-#ifndef GL_GLEXT_PROTOTYPES
-#define GL_GLEXT_PROTOTYPES 1
-#endif
-#include "third_party/khronos/GLES2/gl2ext.h"
-
-#include <algorithm>
-#include <map>
+#include "webkit/common/gpu/webgraphicscontext3d_impl.h"
 
 #include "base/atomicops.h"
-#include "base/bind.h"
-#include "base/command_line.h"
-#include "base/debug/trace_event.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
-#include "base/message_loop/message_loop.h"
-#include "base/metrics/field_trial.h"
-#include "base/metrics/histogram.h"
-#include "content/common/gpu/client/gpu_channel_host.h"
-#include "content/public/common/content_constants.h"
-#include "content/public/common/content_switches.h"
 #include "gpu/GLES2/gl2extchromium.h"
-#include "gpu/command_buffer/client/gles2_cmd_helper.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
 #include "gpu/command_buffer/client/gles2_lib.h"
-#include "gpu/command_buffer/client/gles2_trace_implementation.h"
-#include "gpu/command_buffer/client/transfer_buffer.h"
-#include "gpu/command_buffer/common/constants.h"
-#include "gpu/command_buffer/common/gpu_memory_allocation.h"
-#include "gpu/command_buffer/common/mailbox.h"
 #include "gpu/skia_bindings/gl_bindings_skia_cmd_buffer.h"
-#include "third_party/skia/include/core/SkTypes.h"
+
+#include "third_party/khronos/GLES2/gl2.h"
+#ifndef GL_GLEXT_PROTOTYPES
+#define GL_GLEXT_PROTOTYPES 1
+#endif
+#include "third_party/khronos/GLES2/gl2ext.h"
 
 namespace content {
 
 namespace {
 
-static base::LazyInstance<base::Lock>::Leaky
-    g_default_share_groups_lock = LAZY_INSTANCE_INITIALIZER;
-
-typedef std::map<GpuChannelHost*,
-    scoped_refptr<WebGraphicsContext3DCommandBufferImpl::ShareGroup> >
-    ShareGroupMap;
-static base::LazyInstance<ShareGroupMap> g_default_share_groups =
-    LAZY_INSTANCE_INITIALIZER;
-
-scoped_refptr<WebGraphicsContext3DCommandBufferImpl::ShareGroup>
-    GetDefaultShareGroupForHost(GpuChannelHost* host) {
-  base::AutoLock lock(g_default_share_groups_lock.Get());
-
-  ShareGroupMap& share_groups = g_default_share_groups.Get();
-  ShareGroupMap::iterator it = share_groups.find(host);
-  if (it == share_groups.end()) {
-    scoped_refptr<WebGraphicsContext3DCommandBufferImpl::ShareGroup> group =
-        new WebGraphicsContext3DCommandBufferImpl::ShareGroup();
-    share_groups[host] = group;
-    return group;
-  }
-  return it->second;
-}
-
 uint32_t GenFlushID() {
   static base::subtle::Atomic32 flush_id = 0;
 
@@ -73,501 +30,173 @@ uint32_t GenFlushID() {
   return static_cast<uint32_t>(my_id);
 }
 
-// Singleton used to initialize and terminate the gles2 library.
-class GLES2Initializer {
+} // namespace anonymous
+
+class WebGraphicsContext3DErrorMessageCallback
+    : public gpu::gles2::GLES2ImplementationErrorMessageCallback {
  public:
-  GLES2Initializer() {
-    gles2::Initialize();
+  WebGraphicsContext3DErrorMessageCallback(
+      WebGraphicsContext3DImpl* context)
+      : graphics_context_(context) {
   }
 
-  ~GLES2Initializer() {
-    gles2::Terminate();
-  }
+  virtual void OnErrorMessage(const char* msg, int id) OVERRIDE;
 
  private:
-  DISALLOW_COPY_AND_ASSIGN(GLES2Initializer);
-};
-
-////////////////////////////////////////////////////////////////////////////////
-
-base::LazyInstance<GLES2Initializer> g_gles2_initializer =
-    LAZY_INSTANCE_INITIALIZER;
+  WebGraphicsContext3DImpl* graphics_context_;
 
-////////////////////////////////////////////////////////////////////////////////
+  DISALLOW_COPY_AND_ASSIGN(WebGraphicsContext3DErrorMessageCallback);
+};
 
-} // namespace anonymous
+void WebGraphicsContext3DErrorMessageCallback::OnErrorMessage(
+    const char* msg, int id) {
+  graphics_context_->OnErrorMessage(msg, id);
+}
 
 // Helper macros to reduce the amount of code.
 
 #define DELEGATE_TO_GL(name, glname)                                    \
-void WebGraphicsContext3DCommandBufferImpl::name() {                    \
+void WebGraphicsContext3DImpl::name() {                                 \
   gl_->glname();                                                        \
 }
 
 #define DELEGATE_TO_GL_R(name, glname, rt)                              \
-rt WebGraphicsContext3DCommandBufferImpl::name() {                      \
+rt WebGraphicsContext3DImpl::name() {                                   \
   return gl_->glname();                                                 \
 }
 
 #define DELEGATE_TO_GL_1(name, glname, t1)                              \
-void WebGraphicsContext3DCommandBufferImpl::name(t1 a1) {               \
+void WebGraphicsContext3DImpl::name(t1 a1) {                            \
   gl_->glname(a1);                                                      \
 }
 
 #define DELEGATE_TO_GL_1R(name, glname, t1, rt)                         \
-rt WebGraphicsContext3DCommandBufferImpl::name(t1 a1) {                 \
+rt WebGraphicsContext3DImpl::name(t1 a1) {                              \
   return gl_->glname(a1);                                               \
 }
 
 #define DELEGATE_TO_GL_1RB(name, glname, t1, rt)                        \
-rt WebGraphicsContext3DCommandBufferImpl::name(t1 a1) {                 \
+rt WebGraphicsContext3DImpl::name(t1 a1) {                              \
   return gl_->glname(a1) ? true : false;                                \
 }
 
 #define DELEGATE_TO_GL_2(name, glname, t1, t2)                          \
-void WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2) {        \
+void WebGraphicsContext3DImpl::name(t1 a1, t2 a2) {                     \
   gl_->glname(a1, a2);                                                  \
 }
 
 #define DELEGATE_TO_GL_2R(name, glname, t1, t2, rt)                     \
-rt WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2) {          \
+rt WebGraphicsContext3DImpl::name(t1 a1, t2 a2) {                       \
   return gl_->glname(a1, a2);                                           \
 }
 
 #define DELEGATE_TO_GL_3(name, glname, t1, t2, t3)                      \
-void WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2, t3 a3) { \
+void WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3) {              \
   gl_->glname(a1, a2, a3);                                              \
 }
 
 #define DELEGATE_TO_GL_3R(name, glname, t1, t2, t3, rt)                 \
-rt WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2, t3 a3) {   \
+rt WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3) {                \
   return gl_->glname(a1, a2, a3);                                       \
 }
 
 #define DELEGATE_TO_GL_4(name, glname, t1, t2, t3, t4)                  \
-void WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2, t3 a3,   \
-                                                 t4 a4) {               \
+void WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3, t4 a4) {       \
   gl_->glname(a1, a2, a3, a4);                                          \
 }
 
 #define DELEGATE_TO_GL_4R(name, glname, t1, t2, t3, t4, rt)             \
-rt WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2, t3 a3,     \
-                                               t4 a4) {                 \
+rt WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3, t4 a4) {         \
   return gl_->glname(a1, a2, a3, a4);                                   \
 }
 
 #define DELEGATE_TO_GL_5(name, glname, t1, t2, t3, t4, t5)              \
-void WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2, t3 a3,   \
-                                                 t4 a4, t5 a5) {        \
+void WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5) {\
+                                                                        \
   gl_->glname(a1, a2, a3, a4, a5);                                      \
 }
 
 #define DELEGATE_TO_GL_6(name, glname, t1, t2, t3, t4, t5, t6)          \
-void WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2, t3 a3,   \
-                                                 t4 a4, t5 a5, t6 a6) { \
+void WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5,  \
+                                    t6 a6) {                            \
   gl_->glname(a1, a2, a3, a4, a5, a6);                                  \
 }
 
 #define DELEGATE_TO_GL_7(name, glname, t1, t2, t3, t4, t5, t6, t7)      \
-void WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2, t3 a3,   \
-                                                 t4 a4, t5 a5, t6 a6,   \
-                                                 t7 a7) {               \
+void WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5,  \
+                                    t6 a6, t7 a7) {                     \
   gl_->glname(a1, a2, a3, a4, a5, a6, a7);                              \
 }
 
 #define DELEGATE_TO_GL_8(name, glname, t1, t2, t3, t4, t5, t6, t7, t8)  \
-void WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2, t3 a3,   \
-                                                 t4 a4, t5 a5, t6 a6,   \
-                                                 t7 a7, t8 a8) {        \
+void WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5,  \
+                                    t6 a6, t7 a7, t8 a8) {              \
   gl_->glname(a1, a2, a3, a4, a5, a6, a7, a8);                          \
 }
 
 #define DELEGATE_TO_GL_9(name, glname, t1, t2, t3, t4, t5, t6, t7, t8, t9) \
-void WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2, t3 a3,   \
-                                                 t4 a4, t5 a5, t6 a6,   \
-                                                 t7 a7, t8 a8, t9 a9) { \
+void WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5,  \
+                                    t6 a6, t7 a7, t8 a8, t9 a9) {       \
   gl_->glname(a1, a2, a3, a4, a5, a6, a7, a8, a9);                      \
 }
 
-class WebGraphicsContext3DErrorMessageCallback
-    : public gpu::gles2::GLES2Implementation::ErrorMessageCallback {
- public:
-  WebGraphicsContext3DErrorMessageCallback(
-      WebGraphicsContext3DCommandBufferImpl* context)
-      : graphics_context_(context) {
-  }
-
-  virtual void OnErrorMessage(const char* msg, int id) OVERRIDE;
-
- private:
-  WebGraphicsContext3DCommandBufferImpl* graphics_context_;
-
-  DISALLOW_COPY_AND_ASSIGN(WebGraphicsContext3DErrorMessageCallback);
-};
-
-void WebGraphicsContext3DErrorMessageCallback::OnErrorMessage(
-    const char* msg, int id) {
-  graphics_context_->OnErrorMessage(msg, id);
+#define DELEGATE_TO_GL_9R(name, glname, t1, t2, t3, t4, t5, t6, t7, t8, \
+                          t9, rt)                                       \
+rt WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5,    \
+                                    t6 a6, t7 a7, t8 a8, t9 a9) {       \
+  return gl_->glname(a1, a2, a3, a4, a5, a6, a7, a8, a9);               \
 }
 
-WebGraphicsContext3DCommandBufferImpl::SharedMemoryLimits::SharedMemoryLimits()
-    : command_buffer_size(kDefaultCommandBufferSize),
-      start_transfer_buffer_size(kDefaultStartTransferBufferSize),
-      min_transfer_buffer_size(kDefaultMinTransferBufferSize),
-      max_transfer_buffer_size(kDefaultMaxTransferBufferSize),
-      mapped_memory_reclaim_limit(gpu::gles2::GLES2Implementation::kNoLimit) {}
-
-WebGraphicsContext3DCommandBufferImpl::ShareGroup::ShareGroup() {
-}
-
-WebGraphicsContext3DCommandBufferImpl::ShareGroup::~ShareGroup() {
-  DCHECK(contexts_.empty());
-}
-
-WebGraphicsContext3DCommandBufferImpl::WebGraphicsContext3DCommandBufferImpl(
-    int surface_id,
-    const GURL& active_url,
-    GpuChannelHost* host,
-    const Attributes& attributes,
-    bool lose_context_when_out_of_memory,
-    const SharedMemoryLimits& limits,
-    WebGraphicsContext3DCommandBufferImpl* share_context)
-    : initialize_failed_(false),
-      visible_(false),
-      host_(host),
-      surface_id_(surface_id),
-      active_url_(active_url),
+WebGraphicsContext3DImpl::WebGraphicsContext3DImpl(
+      const Attributes& attributes,
+      bool lose_context_when_out_of_memory)
+    : initialized_(false),
+      initialize_failed_(false),
       context_lost_callback_(0),
       context_lost_reason_(GL_NO_ERROR),
       error_message_callback_(0),
       attributes_(attributes),
-      gpu_preference_(attributes.preferDiscreteGPU ? gfx::PreferDiscreteGpu
-                                                   : gfx::PreferIntegratedGpu),
-      weak_ptr_factory_(this),
-      initialized_(false),
       gl_(NULL),
       lose_context_when_out_of_memory_(lose_context_when_out_of_memory),
-      mem_limits_(limits),
       flush_id_(0) {
-  if (share_context) {
-    DCHECK(!attributes_.shareResources);
-    share_group_ = share_context->share_group_;
-  } else {
-    share_group_ = attributes_.shareResources
-        ? GetDefaultShareGroupForHost(host)
-        : scoped_refptr<WebGraphicsContext3DCommandBufferImpl::ShareGroup>(
-            new ShareGroup());
-  }
-}
-
-WebGraphicsContext3DCommandBufferImpl::
-    ~WebGraphicsContext3DCommandBufferImpl() {
-  if (real_gl_) {
-    real_gl_->SetErrorMessageCallback(NULL);
-  }
-
-  Destroy();
-}
-
-bool WebGraphicsContext3DCommandBufferImpl::MaybeInitializeGL() {
-  if (initialized_)
-    return true;
-
-  if (initialize_failed_)
-    return false;
-
-  TRACE_EVENT0("gpu", "WebGfxCtx3DCmdBfrImpl::MaybeInitializeGL");
-
-  if (!CreateContext(surface_id_ != 0)) {
-    Destroy();
-    initialize_failed_ = true;
-    return false;
-  }
-
-  // TODO(twiz):  This code is too fragile in that it assumes that only WebGL
-  // contexts will request noExtensions.
-  if (gl_ && attributes_.noExtensions)
-    gl_->EnableFeatureCHROMIUM("webgl_enable_glsl_webgl_validation");
-
-  command_buffer_->SetChannelErrorCallback(
-      base::Bind(&WebGraphicsContext3DCommandBufferImpl::OnGpuChannelLost,
-                 weak_ptr_factory_.GetWeakPtr()));
-
-  command_buffer_->SetOnConsoleMessageCallback(
-      base::Bind(&WebGraphicsContext3DCommandBufferImpl::OnErrorMessage,
-                 weak_ptr_factory_.GetWeakPtr()));
-
-  client_error_message_callback_.reset(
-      new WebGraphicsContext3DErrorMessageCallback(this));
-  real_gl_->SetErrorMessageCallback(client_error_message_callback_.get());
-
-  // Set attributes_ from created offscreen context.
-  {
-    static const int pcount = 4;
-    static const GLenum pnames[pcount] = {
-      GL_ALPHA_BITS,
-      GL_DEPTH_BITS,
-      GL_STENCIL_BITS,
-      GL_SAMPLE_BUFFERS,
-    };
-    GLint pvalues[pcount] = { 0, 0, 0, 0 };
-
-    gl_->GetMultipleIntegervCHROMIUM(pnames, pcount,
-                                     pvalues, sizeof(pvalues));
-
-    attributes_.alpha = pvalues[0] > 0;
-    attributes_.depth = pvalues[1] > 0;
-    attributes_.stencil = pvalues[2] > 0;
-    attributes_.antialias = pvalues[3] > 0;
-  }
-
-  visible_ = true;
-  initialized_ = true;
-  return true;
 }
 
-bool WebGraphicsContext3DCommandBufferImpl::InitializeCommandBuffer(
-    bool onscreen, WebGraphicsContext3DCommandBufferImpl* share_context) {
-  if (!host_.get())
-    return false;
-
-  CommandBufferProxyImpl* share_group_command_buffer = NULL;
-
-  if (share_context) {
-    share_group_command_buffer = share_context->command_buffer_.get();
-  }
-
-  std::vector<int32> attribs;
-  attribs.push_back(ALPHA_SIZE);
-  attribs.push_back(attributes_.alpha ? 8 : 0);
-  attribs.push_back(DEPTH_SIZE);
-  attribs.push_back(attributes_.depth ? 24 : 0);
-  attribs.push_back(STENCIL_SIZE);
-  attribs.push_back(attributes_.stencil ? 8 : 0);
-  attribs.push_back(SAMPLES);
-  attribs.push_back(attributes_.antialias ? 4 : 0);
-  attribs.push_back(SAMPLE_BUFFERS);
-  attribs.push_back(attributes_.antialias ? 1 : 0);
-  attribs.push_back(FAIL_IF_MAJOR_PERF_CAVEAT);
-  attribs.push_back(attributes_.failIfMajorPerformanceCaveat ? 1 : 0);
-  attribs.push_back(LOSE_CONTEXT_WHEN_OUT_OF_MEMORY);
-  attribs.push_back(lose_context_when_out_of_memory_ ? 1 : 0);
-  attribs.push_back(BIND_GENERATES_RESOURCES);
-  attribs.push_back(0);
-  attribs.push_back(NONE);
-
-  // Create a proxy to a command buffer in the GPU process.
-  if (onscreen) {
-    command_buffer_.reset(host_->CreateViewCommandBuffer(
-        surface_id_,
-        share_group_command_buffer,
-        attribs,
-        active_url_,
-        gpu_preference_));
-  } else {
-    command_buffer_.reset(host_->CreateOffscreenCommandBuffer(
-        gfx::Size(1, 1),
-        share_group_command_buffer,
-        attribs,
-        active_url_,
-        gpu_preference_));
-  }
-
-  if (!command_buffer_) {
-    DLOG(ERROR) << "GpuChannelHost failed to create command buffer.";
-    return false;
-  }
+WebGraphicsContext3DImpl::~WebGraphicsContext3DImpl() {
 
-  DVLOG_IF(1, gpu::error::IsError(command_buffer_->GetLastError()))
-      << "Context dead on arrival. Last error: "
-      << command_buffer_->GetLastError();
-  // Initialize the command buffer.
-  bool result = command_buffer_->Initialize();
-  LOG_IF(ERROR, !result) << "CommandBufferProxy::Initialize failed.";
-  return result;
 }
 
-bool WebGraphicsContext3DCommandBufferImpl::CreateContext(bool onscreen) {
-  // Ensure the gles2 library is initialized first in a thread safe way.
-  g_gles2_initializer.Get();
-
-  scoped_refptr<gpu::gles2::ShareGroup> gles2_share_group;
-
-  scoped_ptr<base::AutoLock> share_group_lock;
-  bool add_to_share_group = false;
-  if (!command_buffer_) {
-    WebGraphicsContext3DCommandBufferImpl* share_context = NULL;
-
-    share_group_lock.reset(new base::AutoLock(share_group_->lock()));
-    share_context = share_group_->GetAnyContextLocked();
-
-    if (!InitializeCommandBuffer(onscreen, share_context)) {
-      LOG(ERROR) << "Failed to initialize command buffer.";
-      return false;
-    }
-
-    if (share_context)
-      gles2_share_group = share_context->GetImplementation()->share_group();
-
-    add_to_share_group = true;
-  }
-
-  // Create the GLES2 helper, which writes the command buffer protocol.
-  gles2_helper_.reset(new gpu::gles2::GLES2CmdHelper(command_buffer_.get()));
-  if (!gles2_helper_->Initialize(mem_limits_.command_buffer_size)) {
-    LOG(ERROR) << "Failed to initialize GLES2CmdHelper.";
-    return false;
-  }
-
-  if (attributes_.noAutomaticFlushes)
-    gles2_helper_->SetAutomaticFlushes(false);
-  // Create a transfer buffer used to copy resources between the renderer
-  // process and the GPU process.
-  transfer_buffer_ .reset(new gpu::TransferBuffer(gles2_helper_.get()));
-
-  DCHECK(host_.get());
-
-  // Create the object exposing the OpenGL API.
-  bool bind_generates_resources = false;
-  real_gl_.reset(
-      new gpu::gles2::GLES2Implementation(gles2_helper_.get(),
-                                          gles2_share_group,
-                                          transfer_buffer_.get(),
-                                          bind_generates_resources,
-                                          lose_context_when_out_of_memory_,
-                                          command_buffer_.get()));
-  gl_ = real_gl_.get();
-
-  if (!real_gl_->Initialize(
-      mem_limits_.start_transfer_buffer_size,
-      mem_limits_.min_transfer_buffer_size,
-      mem_limits_.max_transfer_buffer_size,
-      mem_limits_.mapped_memory_reclaim_limit)) {
-    LOG(ERROR) << "Failed to initialize GLES2Implementation.";
-    return false;
-  }
-
-  if (add_to_share_group)
-    share_group_->AddContextLocked(this);
-
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableGpuClientTracing)) {
-    trace_gl_.reset(new gpu::gles2::GLES2TraceImplementation(gl_));
-    gl_ = trace_gl_.get();
-  }
-  return true;
-}
-
-bool WebGraphicsContext3DCommandBufferImpl::makeContextCurrent() {
-  if (!MaybeInitializeGL()) {
-    DLOG(ERROR) << "Failed to initialize context.";
-    return false;
-  }
-  gles2::SetGLContext(gl_);
-  if (gpu::error::IsError(command_buffer_->GetLastError())) {
-    LOG(ERROR) << "Context dead on arrival. Last error: "
-               << command_buffer_->GetLastError();
-    return false;
+void WebGraphicsContext3DImpl::synthesizeGLError(WGC3Denum error) {
+  if (std::find(synthetic_errors_.begin(), synthetic_errors_.end(), error) ==
+      synthetic_errors_.end()) {
+    synthetic_errors_.push_back(error);
   }
-
-  return true;
 }
 
-uint32_t WebGraphicsContext3DCommandBufferImpl::lastFlushID() {
+uint32_t WebGraphicsContext3DImpl::lastFlushID() {
   return flush_id_;
 }
 
 DELEGATE_TO_GL_R(insertSyncPoint, InsertSyncPointCHROMIUM, unsigned int)
 
-void WebGraphicsContext3DCommandBufferImpl::Destroy() {
-  share_group_->RemoveContext(this);
-
-  if (gl_) {
-    // First flush the context to ensure that any pending frees of resources
-    // are completed. Otherwise, if this context is part of a share group,
-    // those resources might leak. Also, any remaining side effects of commands
-    // issued on this context might not be visible to other contexts in the
-    // share group.
-    gl_->Flush();
-    gl_ = NULL;
-  }
-
-  trace_gl_.reset();
-  real_gl_.reset();
-  transfer_buffer_.reset();
-  gles2_helper_.reset();
-  real_gl_.reset();
-
-  if (command_buffer_) {
-    if (host_.get())
-      host_->DestroyCommandBuffer(command_buffer_.release());
-    command_buffer_.reset();
-  }
-
-  host_ = NULL;
-}
-
-gpu::ContextSupport*
-WebGraphicsContext3DCommandBufferImpl::GetContextSupport() {
-  return real_gl_.get();
-}
-
-void WebGraphicsContext3DCommandBufferImpl::prepareTexture() {
-  NOTREACHED();
-}
-
-void WebGraphicsContext3DCommandBufferImpl::postSubBufferCHROMIUM(
-    int x, int y, int width, int height) {
-  NOTREACHED();
-}
-
 DELEGATE_TO_GL_3(reshapeWithScaleFactor, ResizeCHROMIUM, int, int, float)
 
-void WebGraphicsContext3DCommandBufferImpl::synthesizeGLError(
-    WGC3Denum error) {
-  if (std::find(synthetic_errors_.begin(), synthetic_errors_.end(), error) ==
-      synthetic_errors_.end()) {
-    synthetic_errors_.push_back(error);
-  }
-}
-
 DELEGATE_TO_GL_4R(mapBufferSubDataCHROMIUM, MapBufferSubDataCHROMIUM, WGC3Denum,
                   WGC3Dintptr, WGC3Dsizeiptr, WGC3Denum, void*)
 
 DELEGATE_TO_GL_1(unmapBufferSubDataCHROMIUM, UnmapBufferSubDataCHROMIUM,
                  const void*)
 
-void* WebGraphicsContext3DCommandBufferImpl::mapTexSubImage2DCHROMIUM(
-    WGC3Denum target,
-    WGC3Dint level,
-    WGC3Dint xoffset,
-    WGC3Dint yoffset,
-    WGC3Dsizei width,
-    WGC3Dsizei height,
-    WGC3Denum format,
-    WGC3Denum type,
-    WGC3Denum access) {
-  return gl_->MapTexSubImage2DCHROMIUM(
-      target, level, xoffset, yoffset, width, height, format, type, access);
-}
+DELEGATE_TO_GL_9R(mapTexSubImage2DCHROMIUM, MapTexSubImage2DCHROMIUM, WGC3Denum,
+                  WGC3Dint, WGC3Dint, WGC3Dint, WGC3Dsizei, WGC3Dsizei,
+                  WGC3Denum, WGC3Denum, WGC3Denum, void*)
 
 DELEGATE_TO_GL_1(unmapTexSubImage2DCHROMIUM, UnmapTexSubImage2DCHROMIUM,
                  const void*)
 
-void WebGraphicsContext3DCommandBufferImpl::setVisibilityCHROMIUM(
-    bool visible) {
-  NOTREACHED();
-}
-
 DELEGATE_TO_GL_3(discardFramebufferEXT, DiscardFramebufferEXT, WGC3Denum,
                  WGC3Dsizei, const WGC3Denum*)
 
-void WebGraphicsContext3DCommandBufferImpl::copyTextureToParentTextureCHROMIUM(
-    WebGLId texture, WebGLId parentTexture) {
-  NOTIMPLEMENTED();
-}
-
-blink::WebString WebGraphicsContext3DCommandBufferImpl::
+blink::WebString WebGraphicsContext3DImpl::
     getRequestableExtensionsCHROMIUM() {
   return blink::WebString::fromUTF8(
       gl_->GetRequestableExtensionsCHROMIUM());
@@ -576,7 +205,7 @@ blink::WebString WebGraphicsContext3DCommandBufferImpl::
 DELEGATE_TO_GL_1(requestExtensionCHROMIUM, RequestExtensionCHROMIUM,
                  const char*)
 
-void WebGraphicsContext3DCommandBufferImpl::blitFramebufferCHROMIUM(
+void WebGraphicsContext3DImpl::blitFramebufferCHROMIUM(
     WGC3Dint srcX0, WGC3Dint srcY0, WGC3Dint srcX1, WGC3Dint srcY1,
     WGC3Dint dstX0, WGC3Dint dstY0, WGC3Dint dstX1, WGC3Dint dstY1,
     WGC3Dbitfield mask, WGC3Denum filter) {
@@ -674,7 +303,7 @@ DELEGATE_TO_GL_1(disableVertexAttribArray, DisableVertexAttribArray,
 
 DELEGATE_TO_GL_3(drawArrays, DrawArrays, WGC3Denum, WGC3Dint, WGC3Dsizei)
 
-void WebGraphicsContext3DCommandBufferImpl::drawElements(WGC3Denum mode,
+void WebGraphicsContext3DImpl::drawElements(WGC3Denum mode,
                                                          WGC3Dsizei count,
                                                          WGC3Denum type,
                                                          WGC3Dintptr offset) {
@@ -688,12 +317,12 @@ DELEGATE_TO_GL_1(enable, Enable, WGC3Denum)
 DELEGATE_TO_GL_1(enableVertexAttribArray, EnableVertexAttribArray,
                  WGC3Duint)
 
-void WebGraphicsContext3DCommandBufferImpl::finish() {
+void WebGraphicsContext3DImpl::finish() {
   flush_id_ = GenFlushID();
   gl_->Finish();
 }
 
-void WebGraphicsContext3DCommandBufferImpl::flush() {
+void WebGraphicsContext3DImpl::flush() {
   flush_id_ = GenFlushID();
   gl_->Flush();
 }
@@ -708,7 +337,7 @@ DELEGATE_TO_GL_1(frontFace, FrontFace, WGC3Denum)
 
 DELEGATE_TO_GL_1(generateMipmap, GenerateMipmap, WGC3Denum)
 
-bool WebGraphicsContext3DCommandBufferImpl::getActiveAttrib(
+bool WebGraphicsContext3DImpl::getActiveAttrib(
     WebGLId program, WGC3Duint index, ActiveInfo& info) {
   if (!program) {
     synthesizeGLError(GL_INVALID_VALUE);
@@ -738,7 +367,7 @@ bool WebGraphicsContext3DCommandBufferImpl::getActiveAttrib(
   return true;
 }
 
-bool WebGraphicsContext3DCommandBufferImpl::getActiveUniform(
+bool WebGraphicsContext3DImpl::getActiveUniform(
     WebGLId program, WGC3Duint index, ActiveInfo& info) {
   GLint max_name_length = -1;
   gl_->GetProgramiv(
@@ -776,11 +405,11 @@ DELEGATE_TO_GL_3(getBufferParameteriv, GetBufferParameteriv,
                  WGC3Denum, WGC3Denum, WGC3Dint*)
 
 blink::WebGraphicsContext3D::Attributes
-WebGraphicsContext3DCommandBufferImpl::getContextAttributes() {
+WebGraphicsContext3DImpl::getContextAttributes() {
   return attributes_;
 }
 
-WGC3Denum WebGraphicsContext3DCommandBufferImpl::getError() {
+WGC3Denum WebGraphicsContext3DImpl::getError() {
   if (!synthetic_errors_.empty()) {
     std::vector<WGC3Denum>::iterator iter = synthetic_errors_.begin();
     WGC3Denum err = *iter;
@@ -791,12 +420,6 @@ WGC3Denum WebGraphicsContext3DCommandBufferImpl::getError() {
   return gl_->GetError();
 }
 
-bool WebGraphicsContext3DCommandBufferImpl::isContextLost() {
-  return initialize_failed_ ||
-      (command_buffer_ && IsCommandBufferContextLost()) ||
-      context_lost_reason_ != GL_NO_ERROR;
-}
-
 DELEGATE_TO_GL_2(getFloatv, GetFloatv, WGC3Denum, WGC3Dfloat*)
 
 DELEGATE_TO_GL_4(getFramebufferAttachmentParameteriv,
@@ -807,7 +430,7 @@ DELEGATE_TO_GL_2(getIntegerv, GetIntegerv, WGC3Denum, WGC3Dint*)
 
 DELEGATE_TO_GL_3(getProgramiv, GetProgramiv, WebGLId, WGC3Denum, WGC3Dint*)
 
-blink::WebString WebGraphicsContext3DCommandBufferImpl::getProgramInfoLog(
+blink::WebString WebGraphicsContext3DImpl::getProgramInfoLog(
     WebGLId program) {
   GLint logLength = 0;
   gl_->GetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
@@ -830,7 +453,7 @@ DELEGATE_TO_GL_3(getRenderbufferParameteriv, GetRenderbufferParameteriv,
 
 DELEGATE_TO_GL_3(getShaderiv, GetShaderiv, WebGLId, WGC3Denum, WGC3Dint*)
 
-blink::WebString WebGraphicsContext3DCommandBufferImpl::getShaderInfoLog(
+blink::WebString WebGraphicsContext3DImpl::getShaderInfoLog(
     WebGLId shader) {
   GLint logLength = 0;
   gl_->GetShaderiv(shader, GL_INFO_LOG_LENGTH, &logLength);
@@ -851,7 +474,7 @@ blink::WebString WebGraphicsContext3DCommandBufferImpl::getShaderInfoLog(
 DELEGATE_TO_GL_4(getShaderPrecisionFormat, GetShaderPrecisionFormat,
                  WGC3Denum, WGC3Denum, WGC3Dint*, WGC3Dint*)
 
-blink::WebString WebGraphicsContext3DCommandBufferImpl::getShaderSource(
+blink::WebString WebGraphicsContext3DImpl::getShaderSource(
     WebGLId shader) {
   GLint logLength = 0;
   gl_->GetShaderiv(shader, GL_SHADER_SOURCE_LENGTH, &logLength);
@@ -871,7 +494,7 @@ blink::WebString WebGraphicsContext3DCommandBufferImpl::getShaderSource(
   return res;
 }
 
-blink::WebString WebGraphicsContext3DCommandBufferImpl::
+blink::WebString WebGraphicsContext3DImpl::
     getTranslatedShaderSourceANGLE(WebGLId shader) {
   GLint logLength = 0;
   gl_->GetShaderiv(
@@ -892,7 +515,7 @@ blink::WebString WebGraphicsContext3DCommandBufferImpl::
   return res;
 }
 
-blink::WebString WebGraphicsContext3DCommandBufferImpl::getString(
+blink::WebString WebGraphicsContext3DImpl::getString(
     WGC3Denum name) {
   return blink::WebString::fromUTF8(
       reinterpret_cast<const char*>(gl_->GetString(name)));
@@ -917,7 +540,7 @@ DELEGATE_TO_GL_3(getVertexAttribfv, GetVertexAttribfv,
 DELEGATE_TO_GL_3(getVertexAttribiv, GetVertexAttribiv,
                  WGC3Duint, WGC3Denum, WGC3Dint*)
 
-WGC3Dsizeiptr WebGraphicsContext3DCommandBufferImpl::getVertexAttribOffset(
+WGC3Dsizeiptr WebGraphicsContext3DImpl::getVertexAttribOffset(
     WGC3Duint index, WGC3Denum pname) {
   GLvoid* value = NULL;
   // NOTE: If pname is ever a value that returns more then 1 element
@@ -954,9 +577,6 @@ DELEGATE_TO_GL_7(readPixels, ReadPixels,
                  WGC3Dint, WGC3Dint, WGC3Dsizei, WGC3Dsizei, WGC3Denum,
                  WGC3Denum, void*)
 
-void WebGraphicsContext3DCommandBufferImpl::releaseShaderCompiler() {
-}
-
 DELEGATE_TO_GL_4(renderbufferStorage, RenderbufferStorage,
                  WGC3Denum, WGC3Denum, WGC3Dsizei, WGC3Dsizei)
 
@@ -964,7 +584,7 @@ DELEGATE_TO_GL_2(sampleCoverage, SampleCoverage, WGC3Dfloat, WGC3Dboolean)
 
 DELEGATE_TO_GL_4(scissor, Scissor, WGC3Dint, WGC3Dint, WGC3Dsizei, WGC3Dsizei)
 
-void WebGraphicsContext3DCommandBufferImpl::shaderSource(
+void WebGraphicsContext3DImpl::shaderSource(
     WebGLId shader, const WGC3Dchar* string) {
   GLint length = strlen(string);
   gl_->ShaderSource(shader, 1, &string, &length);
@@ -995,7 +615,7 @@ DELEGATE_TO_GL_3(texParameterf, TexParameterf,
 
 static const unsigned int kTextureWrapR = 0x8072;
 
-void WebGraphicsContext3DCommandBufferImpl::texParameteri(
+void WebGraphicsContext3DImpl::texParameteri(
     WGC3Denum target, WGC3Denum pname, WGC3Dint param) {
   // TODO(kbr): figure out whether the setting of TEXTURE_WRAP_R in
   // GraphicsContext3D.cpp is strictly necessary to avoid seams at the
@@ -1086,7 +706,7 @@ DELEGATE_TO_GL_5(vertexAttrib4f, VertexAttrib4f, WGC3Duint,
 DELEGATE_TO_GL_2(vertexAttrib4fv, VertexAttrib4fv, WGC3Duint,
                  const WGC3Dfloat*)
 
-void WebGraphicsContext3DCommandBufferImpl::vertexAttribPointer(
+void WebGraphicsContext3DImpl::vertexAttribPointer(
     WGC3Duint index, WGC3Dint size, WGC3Denum type, WGC3Dboolean normalized,
     WGC3Dsizei stride, WGC3Dintptr offset) {
   gl_->VertexAttribPointer(
@@ -1114,45 +734,45 @@ DELEGATE_TO_GL_2(deleteRenderbuffers, DeleteRenderbuffers, WGC3Dsizei,
 
 DELEGATE_TO_GL_2(deleteTextures, DeleteTextures, WGC3Dsizei, WebGLId*);
 
-WebGLId WebGraphicsContext3DCommandBufferImpl::createBuffer() {
+WebGLId WebGraphicsContext3DImpl::createBuffer() {
   GLuint o;
   gl_->GenBuffers(1, &o);
   return o;
 }
 
-WebGLId WebGraphicsContext3DCommandBufferImpl::createFramebuffer() {
+WebGLId WebGraphicsContext3DImpl::createFramebuffer() {
   GLuint o = 0;
   gl_->GenFramebuffers(1, &o);
   return o;
 }
 
-WebGLId WebGraphicsContext3DCommandBufferImpl::createRenderbuffer() {
+WebGLId WebGraphicsContext3DImpl::createRenderbuffer() {
   GLuint o;
   gl_->GenRenderbuffers(1, &o);
   return o;
 }
 
-WebGLId WebGraphicsContext3DCommandBufferImpl::createTexture() {
+WebGLId WebGraphicsContext3DImpl::createTexture() {
   GLuint o;
   gl_->GenTextures(1, &o);
   return o;
 }
 
-void WebGraphicsContext3DCommandBufferImpl::deleteBuffer(WebGLId buffer) {
+void WebGraphicsContext3DImpl::deleteBuffer(WebGLId buffer) {
   gl_->DeleteBuffers(1, &buffer);
 }
 
-void WebGraphicsContext3DCommandBufferImpl::deleteFramebuffer(
+void WebGraphicsContext3DImpl::deleteFramebuffer(
     WebGLId framebuffer) {
   gl_->DeleteFramebuffers(1, &framebuffer);
 }
 
-void WebGraphicsContext3DCommandBufferImpl::deleteRenderbuffer(
+void WebGraphicsContext3DImpl::deleteRenderbuffer(
     WebGLId renderbuffer) {
   gl_->DeleteRenderbuffers(1, &renderbuffer);
 }
 
-void WebGraphicsContext3DCommandBufferImpl::deleteTexture(WebGLId texture) {
+void WebGraphicsContext3DImpl::deleteTexture(WebGLId texture) {
   gl_->DeleteTextures(1, &texture);
 }
 
@@ -1164,72 +784,29 @@ DELEGATE_TO_GL_1(deleteProgram, DeleteProgram, WebGLId)
 
 DELEGATE_TO_GL_1(deleteShader, DeleteShader, WebGLId)
 
-void WebGraphicsContext3DCommandBufferImpl::setErrorMessageCallback(
+void WebGraphicsContext3DImpl::setErrorMessageCallback(
     WebGraphicsContext3D::WebGraphicsErrorMessageCallback* cb) {
   error_message_callback_ = cb;
 }
 
-void WebGraphicsContext3DCommandBufferImpl::setContextLostCallback(
+void WebGraphicsContext3DImpl::setContextLostCallback(
     WebGraphicsContext3D::WebGraphicsContextLostCallback* cb) {
   context_lost_callback_ = cb;
 }
 
-WGC3Denum WebGraphicsContext3DCommandBufferImpl::getGraphicsResetStatusARB() {
-  if (IsCommandBufferContextLost() &&
-      context_lost_reason_ == GL_NO_ERROR) {
-    return GL_UNKNOWN_CONTEXT_RESET_ARB;
-  }
-
-  return context_lost_reason_;
-}
-
-bool WebGraphicsContext3DCommandBufferImpl::IsCommandBufferContextLost() {
-  // If the channel shut down unexpectedly, let that supersede the
-  // command buffer's state.
-  if (host_.get() && host_->IsLost())
-    return true;
-  gpu::CommandBuffer::State state = command_buffer_->GetLastState();
-  return state.error == gpu::error::kLostContext;
-}
-
-// static
-WebGraphicsContext3DCommandBufferImpl*
-WebGraphicsContext3DCommandBufferImpl::CreateOffscreenContext(
-    GpuChannelHost* host,
-    const WebGraphicsContext3D::Attributes& attributes,
-    bool lose_context_when_out_of_memory,
-    const GURL& active_url,
-    const SharedMemoryLimits& limits,
-    WebGraphicsContext3DCommandBufferImpl* share_context) {
-  if (!host)
-    return NULL;
-
-  if (share_context && share_context->IsCommandBufferContextLost())
-    return NULL;
-
-  return new WebGraphicsContext3DCommandBufferImpl(
-      0,
-      active_url,
-      host,
-      attributes,
-      lose_context_when_out_of_memory,
-      limits,
-      share_context);
-}
-
 DELEGATE_TO_GL_5(texImageIOSurface2DCHROMIUM, TexImageIOSurface2DCHROMIUM,
                  WGC3Denum, WGC3Dint, WGC3Dint, WGC3Duint, WGC3Duint)
 
 DELEGATE_TO_GL_5(texStorage2DEXT, TexStorage2DEXT,
                  WGC3Denum, WGC3Dint, WGC3Duint, WGC3Dint, WGC3Dint)
 
-WebGLId WebGraphicsContext3DCommandBufferImpl::createQueryEXT() {
+WebGLId WebGraphicsContext3DImpl::createQueryEXT() {
   GLuint o;
   gl_->GenQueriesEXT(1, &o);
   return o;
 }
 
-void WebGraphicsContext3DCommandBufferImpl::deleteQueryEXT(
+void WebGraphicsContext3DImpl::deleteQueryEXT(
     WebGLId query) {
   gl_->DeleteQueriesEXT(1, &query);
 }
@@ -1247,19 +824,19 @@ DELEGATE_TO_GL_6(copyTextureCHROMIUM, CopyTextureCHROMIUM,  WGC3Denum,
 DELEGATE_TO_GL_3(bindUniformLocationCHROMIUM, BindUniformLocationCHROMIUM,
                  WebGLId, WGC3Dint, const WGC3Dchar*)
 
-void WebGraphicsContext3DCommandBufferImpl::shallowFlushCHROMIUM() {
+void WebGraphicsContext3DImpl::shallowFlushCHROMIUM() {
   flush_id_ = GenFlushID();
   gl_->ShallowFlushCHROMIUM();
 }
 
-void WebGraphicsContext3DCommandBufferImpl::shallowFinishCHROMIUM() {
+void WebGraphicsContext3DImpl::shallowFinishCHROMIUM() {
   flush_id_ = GenFlushID();
   gl_->ShallowFinishCHROMIUM();
 }
 
 DELEGATE_TO_GL_1(waitSyncPoint, WaitSyncPointCHROMIUM, GLuint)
 
-void WebGraphicsContext3DCommandBufferImpl::loseContextCHROMIUM(
+void WebGraphicsContext3DImpl::loseContextCHROMIUM(
     WGC3Denum current, WGC3Denum other) {
   gl_->LoseContextCHROMIUM(current, other);
   gl_->Flush();
@@ -1271,25 +848,25 @@ DELEGATE_TO_GL_2(produceTextureCHROMIUM, ProduceTextureCHROMIUM,
 DELEGATE_TO_GL_2(consumeTextureCHROMIUM, ConsumeTextureCHROMIUM,
                  WGC3Denum, const WGC3Dbyte*)
 
-void WebGraphicsContext3DCommandBufferImpl::insertEventMarkerEXT(
+void WebGraphicsContext3DImpl::insertEventMarkerEXT(
     const WGC3Dchar* marker) {
   gl_->InsertEventMarkerEXT(0, marker);
 }
 
-void WebGraphicsContext3DCommandBufferImpl::pushGroupMarkerEXT(
+void WebGraphicsContext3DImpl::pushGroupMarkerEXT(
     const WGC3Dchar* marker) {
   gl_->PushGroupMarkerEXT(0, marker);
 }
 
 DELEGATE_TO_GL(popGroupMarkerEXT, PopGroupMarkerEXT);
 
-WebGLId WebGraphicsContext3DCommandBufferImpl::createVertexArrayOES() {
+WebGLId WebGraphicsContext3DImpl::createVertexArrayOES() {
   GLuint array;
   gl_->GenVertexArraysOES(1, &array);
   return array;
 }
 
-void WebGraphicsContext3DCommandBufferImpl::deleteVertexArrayOES(
+void WebGraphicsContext3DImpl::deleteVertexArrayOES(
     WebGLId array) {
   gl_->DeleteVertexArraysOES(1, &array);
 }
@@ -1322,7 +899,7 @@ DELEGATE_TO_GL_2(drawBuffersEXT, DrawBuffersEXT, WGC3Dsizei, const WGC3Denum*)
 DELEGATE_TO_GL_4(drawArraysInstancedANGLE, DrawArraysInstancedANGLE, WGC3Denum,
                  WGC3Dint, WGC3Dsizei, WGC3Dsizei)
 
-void WebGraphicsContext3DCommandBufferImpl::drawElementsInstancedANGLE(
+void WebGraphicsContext3DImpl::drawElementsInstancedANGLE(
     WGC3Denum mode,
     WGC3Dsizei count,
     WGC3Denum type,
@@ -1361,51 +938,49 @@ DELEGATE_TO_GL_5(renderbufferStorageMultisampleEXT,
                  RenderbufferStorageMultisampleEXT, WGC3Denum, WGC3Dsizei,
                  WGC3Denum, WGC3Dsizei, WGC3Dsizei)
 
-GrGLInterface* WebGraphicsContext3DCommandBufferImpl::createGrGLInterface() {
+GrGLInterface* WebGraphicsContext3DImpl::createGrGLInterface() {
   makeContextCurrent();
   return skia_bindings::CreateCommandBufferSkiaGLBinding();
 }
 
-namespace {
+gpu::gles2::GLES2ImplementationErrorMessageCallback*
+    WebGraphicsContext3DImpl::getErrorMessageCallback() {
+  if (!client_error_message_callback_) {
+    client_error_message_callback_.reset(
+        new WebGraphicsContext3DErrorMessageCallback(this));
+  }
+  return client_error_message_callback_.get();
+}
 
-WGC3Denum convertReason(gpu::error::ContextLostReason reason) {
-  switch (reason) {
-  case gpu::error::kGuilty:
-    return GL_GUILTY_CONTEXT_RESET_ARB;
-  case gpu::error::kInnocent:
-    return GL_INNOCENT_CONTEXT_RESET_ARB;
-  case gpu::error::kUnknown:
-    return GL_UNKNOWN_CONTEXT_RESET_ARB;
+void WebGraphicsContext3DImpl::OnErrorMessage(
+    const std::string& message, int id) {
+  if (error_message_callback_) {
+    blink::WebString str = blink::WebString::fromUTF8(message.c_str());
+    error_message_callback_->onErrorMessage(str, id);
   }
+}
 
+// TODO(bajones): Look into removing these functions from the blink interface
+void WebGraphicsContext3DImpl::prepareTexture() {
   NOTREACHED();
-  return GL_UNKNOWN_CONTEXT_RESET_ARB;
 }
 
-}  // anonymous namespace
-
-void WebGraphicsContext3DCommandBufferImpl::OnGpuChannelLost() {
-  context_lost_reason_ = convertReason(
-      command_buffer_->GetLastState().context_lost_reason);
-  if (context_lost_callback_) {
-    context_lost_callback_->onContextLost();
-  }
+void WebGraphicsContext3DImpl::postSubBufferCHROMIUM(
+    int x, int y, int width, int height) {
+  NOTREACHED();
+}
 
-  share_group_->RemoveAllContexts();
+void WebGraphicsContext3DImpl::setVisibilityCHROMIUM(
+    bool visible) {
+  NOTREACHED();
+}
 
-  DCHECK(host_.get());
-  {
-    base::AutoLock lock(g_default_share_groups_lock.Get());
-    g_default_share_groups.Get().erase(host_.get());
-  }
+void WebGraphicsContext3DImpl::copyTextureToParentTextureCHROMIUM(
+    WebGLId texture, WebGLId parentTexture) {
+  NOTIMPLEMENTED();
 }
 
-void WebGraphicsContext3DCommandBufferImpl::OnErrorMessage(
-    const std::string& message, int id) {
-  if (error_message_callback_) {
-    blink::WebString str = blink::WebString::fromUTF8(message.c_str());
-    error_message_callback_->onErrorMessage(str, id);
-  }
+void WebGraphicsContext3DImpl::releaseShaderCompiler() {
 }
 
 }  // namespace content