Implemented failIfMajorPerformanceCaveat WebGL context creation attribute.

content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.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/client/webgraphicscontext3d_command_buffer_impl.h"
 
 #include "third_party/khronos/GLES2/gl2.h"
 #ifndef GL_GLEXT_PROTOTYPES
 #define GL_GLEXT_PROTOTYPES 1
 #endif
@@ skipping 323 matching lines @@
   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(NONE);
 
   // Create a proxy to a command buffer in the GPU process.
   if (onscreen) {
     command_buffer_.reset(host_->CreateViewCommandBuffer(
         surface_id_,
         share_group,
         attribs,
         active_url_,
         gpu_preference_));
@@ skipping 1074 matching lines @@
 
 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);
   }
 }
 
 }  // namespace content