Add --disable-low-res-tiling. Disable low res tiling to save power.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 47662bb15f0929e37da18be1069d8472bcf85126..3cc35594d11eeff91c8515d82c44d4c1c1f70f81 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -436,6 +436,12 @@ void RenderThreadImpl::Init() {
     }
   }
 
+  is_low_res_tiling_enabled_ = !is_gpu_rasterization_enabled_;
+  if (command_line.HasSwitch(switches::kDisableLowResTiling) &&
+      !command_line.HasSwitch(switches::kEnableLowResTiling)) {
+    is_low_res_tiling_enabled_ = false;
+  }
+
   // Note that under Linux, the media library will normally already have
   // been initialized by the Zygote before this instance became a Renderer.
   base::FilePath media_path;