content: Improve thread priority for raster threads.

content/browser/renderer_host/compositor_impl_android.cc

Index: content/browser/renderer_host/compositor_impl_android.cc
diff --git a/content/browser/renderer_host/compositor_impl_android.cc b/content/browser/renderer_host/compositor_impl_android.cc
index 5b013553d4492dd75fc4bc1535d4e9eaef5eb82e..722dda8717e4fbb42b08ca2d7d220c02b1573134 100644
--- a/content/browser/renderer_host/compositor_impl_android.cc
+++ b/content/browser/renderer_host/compositor_impl_android.cc
@@ -195,8 +195,7 @@ 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 {