Labeled WebGraphicsContext3D context.

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 136 matching lines @@
 
   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());
+  real_gl_->TraceBeginCHROMIUM("WebGraphicsContext3D",

[no sievers, 2015/12/08 22:17:42]

and this doesn't need 'end'?

[David Yen, 2015/12/08 22:20:40]

It automatically ends when the context is destroyed so it is ok for top level
context traces.

+                               "CommandBufferContext");
 
   visible_ = true;
   initialized_ = true;
   return true;
 }
 
 bool WebGraphicsContext3DCommandBufferImpl::InitializeCommandBuffer(
     bool onscreen, WebGraphicsContext3DCommandBufferImpl* share_context) {
   if (!host_.get())
     return false;
@@ skipping 199 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