Implemented failIfMajorPerformanceCaveat WebGL context creation attribute.

content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h

 // 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.
 
 #ifndef CONTENT_COMMON_GPU_CLIENT_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_
 #define CONTENT_COMMON_GPU_CLIENT_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 643 matching lines @@
     GREEN_SIZE                = 0x3023,
     RED_SIZE                  = 0x3024,
     DEPTH_SIZE                = 0x3025,
     STENCIL_SIZE              = 0x3026,
     SAMPLES                   = 0x3031,
     SAMPLE_BUFFERS            = 0x3032,
     HEIGHT                    = 0x3056,
     WIDTH                     = 0x3057,
     NONE                      = 0x3038,  // Attrib list = terminator
     SHARE_RESOURCES           = 0x10000,
-    BIND_GENERATES_RESOURCES  = 0x10001
+    BIND_GENERATES_RESOURCES  = 0x10001,
+    FAIL_IF_MAJOR_PERF_CAVEAT = 0x10002

[piman, 2013/11/20 22:44:55]

Can you also implement this in the in-process context, in
webkit/common/gpu/webgraphicscontext3d_in_process_command_buffer_impl.*

   };
   friend class WebGraphicsContext3DErrorMessageCallback;
 
   // Initialize the underlying GL context. May be called multiple times; second
   // and subsequent calls are ignored. Must be called from the thread that is
   // going to use this object to issue GL commands (which might not be the main
   // thread).
   bool MaybeInitializeGL();
 
   bool InitializeCommandBuffer(bool onscreen);
@@ skipping 61 matching lines @@
   bool bind_generates_resources_;
   bool use_echo_for_swap_ack_;
   SharedMemoryLimits mem_limits_;
 
   uint32_t flush_id_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_