content: Increase thread priority for display critical IO threads on ChromeOS.

content/gpu/in_process_gpu_thread.cc

 // Copyright 2013 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/in_process_gpu_thread.h"
 
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "content/common/gpu/gpu_memory_buffer_factory.h"
 #include "content/gpu/gpu_child_thread.h"
@@ skipping 21 matching lines @@
     sync_point_manager_.reset(new gpu::SyncPointManager(false));
     sync_point_manager_override_ = sync_point_manager_.get();
   }
 }
 
 InProcessGpuThread::~InProcessGpuThread() {
   Stop();
 }
 
 void InProcessGpuThread::Init() {
+  base::ThreadPriority io_thread_priority = base::ThreadPriority::NORMAL;
+
+#if defined(OS_ANDROID)
   // Call AttachCurrentThreadWithName, before any other AttachCurrentThread()
   // calls. The latter causes Java VM to assign Thread-??? to the thread name.
   // Please note calls to AttachCurrentThreadWithName after AttachCurrentThread
   // will not change the thread name kept in Java VM.
-#if defined(OS_ANDROID)
   base::android::AttachCurrentThreadWithName(thread_name());
+  // Up the priority of the |io_thread_| on Android.
+  io_thread_priority = base::ThreadPriority::DISPLAY;
 #endif
 
-  gpu_process_ = new GpuProcess();
+  gpu_process_ = new GpuProcess(io_thread_priority);
 
   // The process object takes ownership of the thread object, so do not
   // save and delete the pointer.
   GpuChildThread* child_thread = new GpuChildThread(
       params_, gpu_memory_buffer_factory_.get(), sync_point_manager_override_);
 
   // Since we are in the browser process, use the thread start time as the
   // process start time.
   child_thread->Init(base::Time::Now());
 
   gpu_process_->set_main_thread(child_thread);
 }
 
 void InProcessGpuThread::CleanUp() {
   SetThreadWasQuitProperly(true);
   delete gpu_process_;
 }
 
 base::Thread* CreateInProcessGpuThread(
     const InProcessChildThreadParams& params) {
   return new InProcessGpuThread(params, nullptr);
 }
 
 }  // namespace content