content: Improve thread priority for raster threads.

content/browser/gpu/compositor_util.cc

Index: content/browser/gpu/compositor_util.cc
diff --git a/content/browser/gpu/compositor_util.cc b/content/browser/gpu/compositor_util.cc
index 1438e6a1d62fd0c2f2a8dc58981be72caede68dd..44f1fbea0870584687ace3d15ac2898b5ef2f806 100644
--- a/content/browser/gpu/compositor_util.cc
+++ b/content/browser/gpu/compositor_util.cc
@@ -188,13 +188,6 @@ int NumberOfRendererRasterThreads() {
 
   int num_raster_threads = num_processors / 2;
 
-#if defined(OS_ANDROID)
-  // Limit the number of raster threads to 1 on Android.
-  // TODO(reveman): Remove this when we have a better mechanims to prevent
-  // pre-paint raster work from slowing down non-raster work. crbug.com/504515
-  num_raster_threads = 1;
-#endif
-
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();