Added GPU process "echo" IPC message.

content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.cc

 // Copyright (c) 2011 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.
 
 #if defined(ENABLE_GPU)
 
 #include "content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h"
 
 #include "gpu/GLES2/gl2.h"
 #ifndef GL_GLEXT_PROTOTYPES
@@ skipping 31 matching lines @@
       web_view_(NULL),
 #endif
 #if defined(OS_MACOSX)
       plugin_handle_(NULL),
 #endif  // defined(OS_MACOSX)
       context_lost_callback_(0),
       context_lost_reason_(GL_NO_ERROR),
       swapbuffers_complete_callback_(0),
       cached_width_(0),
       cached_height_(0),
-      bound_fbo_(0) {
+      bound_fbo_(0),
+      method_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
 }
 
 WebGraphicsContext3DCommandBufferImpl::
     ~WebGraphicsContext3DCommandBufferImpl() {
   g_all_shared_contexts.Pointer()->erase(this);
   delete context_;
 }
 
 // This string should only be passed for WebGL contexts. Nothing ELSE!!!
 // Compositor contexts, Canvas2D contexts, Pepper Contexts, nor any other use of
@@ skipping 67 matching lines @@
       return false;
     web_view_ = web_view;
 #endif
     context_ = RendererGLContext::CreateViewContext(
         host,
         renderview->routing_id(),
         share_group,
         preferred_extensions,
         attribs,
         active_url);
-    if (context_) {
-      context_->SetSwapBuffersCallback(
-          NewCallback(this,
-              &WebGraphicsContext3DCommandBufferImpl::OnSwapBuffersComplete));
-    }
   } else {
     context_ = RendererGLContext::CreateOffscreenContext(
         host,
         gfx::Size(1, 1),
         share_group,
         preferred_extensions,
         attribs,
         active_url);
 #ifndef WTF_USE_THREADED_COMPOSITING
     web_view_ = NULL;
@@ skipping 68 matching lines @@
 void WebGraphicsContext3DCommandBufferImpl::prepareTexture() {
   // Copies the contents of the off-screen render target into the texture
   // used by the compositor.
 #ifndef WTF_USE_THREADED_COMPOSITING
   RenderView* renderview =
       web_view_ ? RenderView::FromWebView(web_view_) : NULL;
   if (renderview)
     renderview->OnViewContextSwapBuffersPosted();
 #endif
   context_->SwapBuffers();
+  context_->Echo(method_factory_.NewRunnableMethod(
+      &WebGraphicsContext3DCommandBufferImpl::OnSwapBuffersComplete));
 #if defined(OS_MACOSX)
   // It appears that making the compositor's on-screen context current on
   // other platforms implies this flush. TODO(kbr): this means that the
   // TOUCH build and, in the future, other platforms might need this.
   gl_->Flush();
 #endif
 }
 
 void WebGraphicsContext3DCommandBufferImpl::reshape(int width, int height) {
   cached_width_ = width;
@@ skipping 823 matching lines @@
   }
 #ifndef WTF_USE_THREADED_COMPOSITING
   RenderView* renderview =
       web_view_ ? RenderView::FromWebView(web_view_) : NULL;
   if (renderview)
     renderview->OnViewContextSwapBuffersAborted();
 #endif
 }
 
 #endif  // defined(ENABLE_GPU)