Added GL_CHROMIUM_trace_marker feature as well as gpu_toplevel markers.

content/common/gpu/client/context_provider_command_buffer.cc

Index: content/common/gpu/client/context_provider_command_buffer.cc
diff --git a/content/common/gpu/client/context_provider_command_buffer.cc b/content/common/gpu/client/context_provider_command_buffer.cc
index a4c3111c0cea56475463ae9eac507a986afb95b3..f1aaa884350c70d2ac242044b3fa42ce41b6da1a 100644
--- a/content/common/gpu/client/context_provider_command_buffer.cc
+++ b/content/common/gpu/client/context_provider_command_buffer.cc
@@ -98,7 +98,7 @@ bool ContextProviderCommandBuffer::BindToCurrentThread() {
 
   std::string unique_context_name =
       base::StringPrintf("%s-%p", debug_name_.c_str(), context3d_.get());
-  context3d_->pushGroupMarkerEXT(unique_context_name.c_str());
+  context3d_->traceBeginCHROMIUM("gpu_toplevel", unique_context_name.c_str());
 
   lost_context_callback_proxy_.reset(new LostContextCallbackProxy(this));
   context3d_->GetCommandBufferProxy()->SetMemoryAllocationChangedCallback(
@@ -199,6 +199,7 @@ void ContextProviderCommandBuffer::InitializeCapabilities() {
 
 bool ContextProviderCommandBuffer::DestroyedOnMainThread() {
   DCHECK(main_thread_checker_.CalledOnValidThread());
+  context3d_->traceEndCHROMIUM();

[vmiura, 2014/12/18 19:30:27]

Likewise, can we just remove this call, as GL_CHROMIUM_trace_marker spec implies
that this is not needed.

[David Yen, 2014/12/18 21:25:59]

Done.

 
   base::AutoLock lock(main_thread_lock_);
   return destroyed_;