Creating a framework for suppressing pollution of the profiler data

content/browser/gpu/browser_gpu_channel_host_factory.cc

 // 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/browser/gpu/browser_gpu_channel_host_factory.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread_restrictions.h"
+#include "base/tracked_objects.h"
 #include "content/browser/gpu/gpu_data_manager_impl.h"
 #include "content/browser/gpu/gpu_process_host.h"
 #include "content/browser/gpu/gpu_surface_tracker.h"
 #include "content/common/child_process_host_impl.h"
 #include "content/common/gpu/client/gpu_memory_buffer_impl.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/gpu_data_manager.h"
 #include "content/public/common/content_client.h"
 #include "ipc/ipc_channel_handle.h"
@@ skipping 141 matching lines @@
     BrowserGpuChannelHostFactory* factory =
         BrowserGpuChannelHostFactory::instance();
     factory->GpuChannelEstablished();
     finished_ = true;
   }
 }
 
 void BrowserGpuChannelHostFactory::EstablishRequest::Wait() {
   DCHECK(main_loop_->BelongsToCurrentThread());
   {
+    // Since the current task synchronously waits for establishing a GPU
+    // channel, it shouldn't be tallied because its execution time has nothing
+    // to do with its efficiency. Using task stopwatch to exclude the waiting
+    // time from the current task run time.
+    tracked_objects::TaskStopwatch stopwatch;
+    stopwatch.Start();
     // We're blocking the UI thread, which is generally undesirable.
     // In this case we need to wait for this before we can show any UI
     // /anyway/, so it won't cause additional jank.
     // TODO(piman): Make this asynchronous (http://crbug.com/125248).
     TRACE_EVENT0("browser",
                  "BrowserGpuChannelHostFactory::EstablishGpuChannelSync");
     base::ThreadRestrictions::ScopedAllowWait allow_wait;
     event_.Wait();
+
+    stopwatch.Stop();
   }
   FinishOnMain();
 }
 
 void BrowserGpuChannelHostFactory::EstablishRequest::Cancel() {
   DCHECK(main_loop_->BelongsToCurrentThread());
   finished_ = true;
 }
 
 bool BrowserGpuChannelHostFactory::CanUseForTesting() {
@@ skipping 273 matching lines @@
   filter->AddRoute(MSG_ROUTING_CONTROL, handler);
 
   GetIOLoopProxy()->PostTask(
       FROM_HERE,
       base::Bind(&BrowserGpuChannelHostFactory::AddFilterOnIO,
                  gpu_host_id_,
                  filter));
 }
 
 }  // namespace content