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 630 matching lines @@
   // These are the same error codes as used by EGL.
   enum Error {
     SUCCESS               = 0x3000,
     BAD_ATTRIBUTE         = 0x3004,
     CONTEXT_LOST          = 0x300E
   };
   // WebGraphicsContext3DCommandBufferImpl configuration attributes. Those in
   // the 16-bit range are the same as used by EGL. Those outside the 16-bit
   // range are unique to Chromium. Attributes are matched using a closest fit
   // algorithm.
+  // To ensure attributes are read by the GPU process changes to this
+  // enum should also be copied to gpu/command_buffer/common/gles2_cmd_utils.cc.
   enum Attribute {
     ALPHA_SIZE                = 0x3021,
     BLUE_SIZE                 = 0x3022,
     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
   };
   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_