Disable automatic flushes on compositor contexts.

ui/compositor/compositor.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 "ui/compositor/compositor.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/threading/thread_restrictions.h"
@@ skipping 85 matching lines @@
 
 WebKit::WebGraphicsContext3D* DefaultContextFactory::CreateContextCommon(
     Compositor* compositor,
     bool offscreen) {
   DCHECK(offscreen || compositor);
   WebKit::WebGraphicsContext3D::Attributes attrs;
   attrs.depth = false;
   attrs.stencil = false;
   attrs.antialias = false;
   attrs.shareResources = true;
+  attrs.noAutomaticFlushes = !offscreen;

[piman, 2012/10/16 03:07:14]

It's ignored anyway by WebGraphicsContext3DInProcessImpl. I wouldn't even worry
about setting it, but if you insist, just setting it to true is fine.

   WebKit::WebGraphicsContext3D* context =
       offscreen ?
       webkit::gpu::WebGraphicsContext3DInProcessImpl::CreateForWebView(
           attrs, false) :
       webkit::gpu::WebGraphicsContext3DInProcessImpl::CreateForWindow(
           attrs, compositor->widget(), share_group_.get());
   if (!context)
     return NULL;
 
   CommandLine* command_line = CommandLine::ForCurrentProcess();
@@ skipping 320 matching lines @@
 
 COMPOSITOR_EXPORT void DisableTestCompositor() {
   test_compositor_enabled = false;
 }
 
 COMPOSITOR_EXPORT bool IsTestCompositorEnabled() {
   return test_compositor_enabled;
 }
 
 }  // namespace ui