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

cc/base/switches.cc

Index: cc/base/switches.cc
diff --git a/cc/base/switches.cc b/cc/base/switches.cc
index 1fb7ac98e37d6b3b87e1431a530bd25cd16a291e..e09fdf572a5e92dd183ae501ef138eecc6450195 100644
--- a/cc/base/switches.cc
+++ b/cc/base/switches.cc
@@ -45,6 +45,15 @@ const char kEnableGPURasterization[] = "enable-gpu-rasterization";
 // Overrides the kEnableGPURasterization flag.
 const char kDisableGPURasterization[] = "disable-gpu-rasterization";
 
+// When using CPU rasterizing generate low resolution tiling. Low res
+// tiles may be displayed during fast scrolls especially on slower devices.
+const char kEnableLowResTiling[] = "enable-low-res-tiling";
+
+// When using CPU rasterizing disable low resolution tiling. This uses
+// less power, particularly during animations, but more white may be seen
+// during fast scrolling especially on slower devices.
+const char kDisableLowResTiling[] = "disable-low-res-tiling";
+
 // The height of the movable top controls.
 const char kTopControlsHeight[] = "top-controls-height";
 
@@ -176,6 +185,17 @@ bool IsGpuRasterizationEnabled() {
   return false;
 }
 
+bool IsLowResTilingEnabled() {
+  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
+
+  if (command_line.HasSwitch(switches::kDisableLowResTiling))
+    return false;
+  else if (command_line.HasSwitch(switches::kEnableLowResTiling))
+    return true;
+
+  return true;
+}
+
 bool IsImplSidePaintingEnabled() {
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();