content: Improve thread priority for raster threads.

content/browser/renderer_host/compositor_impl_android.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/renderer_host/compositor_impl_android.h"
 
 #include <android/bitmap.h>
 #include <android/native_window_jni.h>
 #include <stdint.h>
 #include <utility>
@@ skipping 176 matching lines @@
 static bool g_initialized = false;
 
 base::LazyInstance<cc::SurfaceManager> g_surface_manager =
     LAZY_INSTANCE_INITIALIZER;
 
 int g_surface_id_namespace = 0;
 
 class SingleThreadTaskGraphRunner : public cc::SingleThreadTaskGraphRunner {
  public:
   SingleThreadTaskGraphRunner() {
-    Start("CompositorTileWorker1",
-          base::SimpleThread::Options(base::ThreadPriority::BACKGROUND));
+    Start("CompositorTileWorker1", base::SimpleThread::Options());
   }
 
   ~SingleThreadTaskGraphRunner() override {
     Shutdown();
   }
 };
 
 base::LazyInstance<SingleThreadTaskGraphRunner> g_task_graph_runner =
     LAZY_INSTANCE_INITIALIZER;
 
@@ skipping 436 matching lines @@
 
 void CompositorImpl::SetNeedsAnimate() {
   needs_animate_ = true;
   if (!host_->visible())
     return;
 
   host_->SetNeedsAnimate();
 }
 
 }  // namespace content