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

cc/layers/picture_layer_impl.h

Index: cc/layers/picture_layer_impl.h
diff --git a/cc/layers/picture_layer_impl.h b/cc/layers/picture_layer_impl.h
index afa35f1664edb320d4ceb7ccbf74e5ec0ebe145f..1d36f8d26a08ee9de57a464b297cc07cae8ece67 100644
--- a/cc/layers/picture_layer_impl.h
+++ b/cc/layers/picture_layer_impl.h
@@ -87,7 +87,7 @@ class CC_EXPORT PictureLayerImpl
   void RemoveAllTilings();
   void SyncFromActiveLayer(const PictureLayerImpl* other);
   void ManageTilings(bool animating_transform_to_screen);
-  bool ShouldHaveLowResTiling() const { return !ShouldUseGpuRasterization(); }
+  bool ShouldHaveLowResTiling() const { return should_use_low_res_tiling_; }
   virtual bool ShouldAdjustRasterScale(
       bool animating_transform_to_screen) const;
   virtual void RecalculateRasterScales(
@@ -146,6 +146,7 @@ class CC_EXPORT PictureLayerImpl
   // after a CalculateContentsScale/ManageTilings.
   bool should_update_tile_priorities_;
   bool has_gpu_rasterization_hint_;
+  bool should_use_low_res_tiling_;
 
   friend class PictureLayer;
   DISALLOW_COPY_AND_ASSIGN(PictureLayerImpl);