Added GL_CHROMIUM_trace_marker feature as well as gpu_toplevel markers.

content/browser/renderer_host/render_widget_host_view_android.cc

Index: content/browser/renderer_host/render_widget_host_view_android.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_android.cc b/content/browser/renderer_host/render_widget_host_view_android.cc
index 574c88fb9f24b07bc52da3014d167cb083a98974..154506aa1a1f65a2074ebbab01cf656168559622 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -135,6 +135,9 @@ GLHelperHolder::GLHelperHolder() {
 }
 
 GLHelperHolder::~GLHelperHolder() {
+  if (context_) {
+    context_->traceEndCHROMIUM();

[David Yen, 2014/12/18 21:26:00]

Should this one be removed as well?

[vmiura, 2014/12/18 21:49:39]

Yeah, let's remove this one as well.

[David Yen, 2014/12/18 21:54:27]

Done.

+  }
 }
 
 void GLHelperHolder::Initialize() {
@@ -191,7 +194,8 @@ GLHelperHolder::CreateContext3D() {
           url, gpu_channel_host.get(), attrs, lose_context_when_out_of_memory,
           limits, nullptr));
   if (context->InitializeOnCurrentThread()) {
-    context->pushGroupMarkerEXT(
+    context->traceBeginCHROMIUM(
+        "gpu_toplevel",
         base::StringPrintf("CmdBufferImageTransportFactory-%p",
                            context.get()).c_str());
   } else {