Move AW renderer compositor context to gpu thread

gpu/command_buffer/service/gpu_switches.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 "gpu/command_buffer/service/gpu_switches.h"
 #include "base/basictypes.h"
 
 namespace switches {
 
 // Always return success when compiling a shader. Linking will still fail.
@@ skipping 47 matching lines @@
 
 // Enable WebGL subscribe uniform extension.
 const char kEnableSubscribeUniformExtension[] =
     "enable-subscribe-uniform-extension";
 
 // Simulates shared textures when share groups are not available. Not available
 // everywhere.
 const char kEnableThreadedTextureMailboxes[] =
     "enable-threaded-texture-mailboxes";
 
+const char kEnableAsyncPixelWithThreadedTextureMailboxes[] =
+    "enable-async-pixel-with-threaded-texture-mailboxes";
+
 // Enable OpenGL ES 3 APIs without proper service side validation.
 const char kEnableUnsafeES3APIs[] = "enable-unsafe-es3-apis";
 
 // Include ANGLE's intermediate representation (AST) output in shader
 // compilation info logs.
 const char kGLShaderIntermOutput[] = "gl-shader-interm-output";
 
 // Emulate ESSL lowp and mediump float precisions by mutating the shaders to
 // round intermediate values in ANGLE.
 const char kEmulateShaderPrecision[] = "emulate-shader-precision";
@@ skipping 16 matching lines @@
   kEnableShareGroupAsyncTextureUpload,
   kEnableUnsafeES3APIs,
   kEnableSubscribeUniformExtension,
   kGLShaderIntermOutput,
   kEmulateShaderPrecision,
 };
 
 const int kNumGpuSwitches = arraysize(kGpuSwitches);
 
 }  // namespace switches