Teach GPU command buffer whether a context is webgl.

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 127 matching lines @@
       FROM_HERE_WITH_EXPLICIT_FUNCTION(
           "125248 WebGraphicsContext3DCommandBufferImpl::MaybeInitializeGL"));
 
   if (!CreateContext(surface_id_ != 0)) {
     Destroy();
 
     initialize_failed_ = true;
     return false;
   }
 
-  if (gl_ && attributes_.webGL)
-    gl_->EnableFeatureCHROMIUM("webgl_enable_glsl_webgl_validation");
-
   command_buffer_->SetContextLostCallback(
       base::Bind(&WebGraphicsContext3DCommandBufferImpl::OnContextLost,
                  weak_ptr_factory_.GetWeakPtr()));
 
   command_buffer_->SetOnConsoleMessageCallback(
       base::Bind(&WebGraphicsContext3DCommandBufferImpl::OnErrorMessage,
                  weak_ptr_factory_.GetWeakPtr()));
 
   real_gl_->SetErrorMessageCallback(getErrorMessageCallback());
 
@@ skipping 258 matching lines @@
   {
     base::AutoLock lock(g_default_share_groups_lock.Get());
     g_default_share_groups.Get().erase(host_.get());
   }
 
   gpu::CommandBuffer::State state = command_buffer_->GetLastState();
   UmaRecordContextLost(context_type_, state.error, state.context_lost_reason);
 }
 
 }  // namespace content