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 37e8a9b27c3cb9e97c03396a8cda99c83061372d..49ff2a5a2d70f1b504a7c70fd29f50dfe9b03163 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -427,6 +427,12 @@ 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;