Merge Group Markers into Chromium Traces.

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 dc4df92d7e2d28820ae34f3511e6bf558ea618e5..0274e5fd3576a970baa6ee4500036baa53462b2b 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -210,10 +210,11 @@ GLHelperHolder::CreateContext3D() {
           url, gpu_channel_host.get(), attrs, lose_context_when_out_of_memory,
           limits, nullptr));
   if (context->InitializeOnCurrentThread()) {
-    context->traceBeginCHROMIUM(
-        "gpu_toplevel",
+    const std::string label =
         base::StringPrintf("CmdBufferImageTransportFactory-%p",
-                           context.get()).c_str());
+                           context.get());
+    context->pushGroupMarkerEXT(label.c_str());
+    context->traceBeginCHROMIUM("gpu_toplevel", label.c_str());

[vmiura, 2015/05/12 21:47:42]

Same here.

   } else {
     context.reset();
   }