Add trace events to measure GPU process startup timing and time to first present.

content/gpu/gpu_info_collector_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/gpu/gpu_info_collector.h"
 
 #include <vector>
 
+#include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string_piece.h"
 #include "base/sys_string_conversions.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_interface.h"
 
@@ skipping 131 matching lines @@
   return (gpu_info->gpu.vendor_id && gpu_info->gpu.device_id);
 }
 
 }  // namespace anonymous
 
 namespace gpu_info_collector {
 
 bool CollectGraphicsInfo(content::GPUInfo* gpu_info) {
   DCHECK(gpu_info);
 
+  TRACE_EVENT0("gpu", "gpu_info_collector::CollectGraphicsInfo");
+
   gpu_info->can_lose_context =
       (gfx::GetGLImplementation() == gfx::kGLImplementationEGLGLES2);
   gpu_info->finalized = true;
   return CollectGraphicsInfoGL(gpu_info);
 }
 
 bool CollectPreliminaryGraphicsInfo(content::GPUInfo* gpu_info) {
   DCHECK(gpu_info);
 
   return CollectPCIVideoCardInfo(gpu_info);
@@ skipping 12 matching lines @@
   // Use some jiggery-pokery to turn that utf8 string into a std::wstring.
   std::string gl_version_string = gpu_info->gl_version_string;
   size_t pos = gl_version_string.find_last_of('-');
   if (pos == std::string::npos)
     return false;
   gpu_info->driver_version = gl_version_string.substr(pos + 1);
   return true;
 }
 
 }  // namespace gpu_info_collector