Increase priority of raster threads on Android.

content/renderer/gpu/compositor_output_surface.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/renderer/gpu/compositor_output_surface.h"
 
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 198 matching lines @@
   ReclaimResources(&ack);
 }
 
 bool CompositorOutputSurface::Send(IPC::Message* message) {
   return message_sender_->Send(message);
 }
 
 namespace {
 #if defined(OS_ANDROID)
   void SetThreadPriorityToIdle(base::PlatformThreadHandle handle) {
-    base::PlatformThread::SetThreadPriority(handle,
-                                            base::ThreadPriority::BACKGROUND);
+    base::PlatformThread::SetThreadPriority(
+        handle, base::ThreadPriority::UI_BACKGROUND);
   }
   void SetThreadPriorityToDefault(base::PlatformThreadHandle handle) {
     base::PlatformThread::SetThreadPriority(handle,
                                             base::ThreadPriority::NORMAL);
   }
 #else
   void SetThreadPriorityToIdle(base::PlatformThreadHandle handle) {}
   void SetThreadPriorityToDefault(base::PlatformThreadHandle handle) {}
 #endif
 }
@@ skipping 17 matching lines @@
   // If this is the last surface to stop preferring smoothness,
   // Reset the main thread's priority to the default.
   if (prefers_smoothness_ == true &&
       --g_prefer_smoothness_count == 0) {
     SetThreadPriorityToDefault(main_thread_handle_);
   }
   prefers_smoothness_ = prefers_smoothness;
 }
 
 }  // namespace content