Added GL_CHROMIUM_trace_marker feature as well as gpu_toplevel markers.

webkit/common/gpu/context_provider_in_process.cc

Index: webkit/common/gpu/context_provider_in_process.cc
diff --git a/webkit/common/gpu/context_provider_in_process.cc b/webkit/common/gpu/context_provider_in_process.cc
index b02d961d70cf109cdf434197fe6dc7b86551df41..9eb6e41bafc187acdaed1b0720a4303fb136aec1 100644
--- a/webkit/common/gpu/context_provider_in_process.cc
+++ b/webkit/common/gpu/context_provider_in_process.cc
@@ -102,7 +102,8 @@ bool ContextProviderInProcess::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));
   return true;