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

cc/base/switches.h

Index: cc/base/switches.h
diff --git a/cc/base/switches.h b/cc/base/switches.h
index 92339cbea24138c7f8f7841ab3ea2d4ab8807e02..12a966cb9174432720b268fdfd462cb60c3e2e6d 100644
--- a/cc/base/switches.h
+++ b/cc/base/switches.h
@@ -16,9 +16,11 @@ namespace cc {
 namespace switches {
 
 // Switches for the renderer compositor only.
+CC_EXPORT extern const char kDisableLowResTiling[];
 CC_EXPORT extern const char kDisableThreadedAnimation[];
 CC_EXPORT extern const char kDisableCompositedAntialiasing[];
 CC_EXPORT extern const char kEnableTopControlsPositionCalculation[];
+CC_EXPORT extern const char kEnableLowResTiling[];
 CC_EXPORT extern const char kJankInsteadOfCheckerboard[];
 CC_EXPORT extern const char kTopControlsHeight[];
 CC_EXPORT extern const char kTopControlsHideThreshold[];
@@ -60,6 +62,8 @@ CC_EXPORT extern const char kUIShowNonOccludingRects[];
 CC_EXPORT extern const char kCCLayerTreeTestNoTimeout[];
 CC_EXPORT extern const char kCCRebaselinePixeltests[];
 
+CC_EXPORT bool IsLowResTilingEnabled();
+
 }  // namespace switches
 }  // namespace cc