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..de8443f56a790a8fa16d2132bbbd2ee2e6571fc1 100644
--- a/webkit/common/gpu/context_provider_in_process.cc
+++ b/webkit/common/gpu/context_provider_in_process.cc
@@ -66,7 +66,9 @@ ContextProviderInProcess::CreateOffscreen(
 ContextProviderInProcess::ContextProviderInProcess(
     scoped_ptr<WebGraphicsContext3DInProcessCommandBufferImpl> context3d,
     const std::string& debug_name)
-    : context3d_(context3d.Pass()),
+    : gpu_trace_top_level_category_(TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(
+          TRACE_DISABLED_BY_DEFAULT("gpu_toplevel"))),
+      context3d_(context3d.Pass()),
       destroyed_(false),
       debug_name_(debug_name) {
   DCHECK(main_thread_checker_.CalledOnValidThread());
@@ -100,9 +102,13 @@ bool ContextProviderInProcess::BindToCurrentThread() {
 
   InitializeCapabilities();
 
-  std::string unique_context_name =
-      base::StringPrintf("%s-%p", debug_name_.c_str(), context3d_.get());
-  context3d_->pushGroupMarkerEXT(unique_context_name.c_str());
+  if (*gpu_trace_top_level_category_) {

[vmiura, 2014/12/09 00:18:11]

Same with these.

+    std::string unique_context_name =
+        base::StringPrintf("%s-%p", debug_name_.c_str(), context3d_.get());
+    TRACE_GPU_EVENT_BEGIN0(context3d_,
+                           TRACE_DISABLED_BY_DEFAULT("gpu_toplevel"),
+                           unique_context_name.c_str());
+  }
 
   lost_context_callback_proxy_.reset(new LostContextCallbackProxy(this));
   return true;
@@ -194,6 +200,9 @@ void ContextProviderInProcess::OnLostContext() {
 
 bool ContextProviderInProcess::DestroyedOnMainThread() {
   DCHECK(main_thread_checker_.CalledOnValidThread());
+  if (*gpu_trace_top_level_category_) {
+    TRACE_GPU_EVENT_END0(context3d_);
+  }
 
   base::AutoLock lock(destroyed_lock_);
   return destroyed_;