cc: Implement deadine scheduling disabled by default

cc/base/switches.h

Index: cc/base/switches.h
diff --git a/cc/base/switches.h b/cc/base/switches.h
index b8585e2201551c260cf9aa774d9db5eef3b3e5e7..64ff41ddeff64d80567a835d4025c74efbff406d 100644
--- a/cc/base/switches.h
+++ b/cc/base/switches.h
@@ -44,6 +44,8 @@ CC_EXPORT extern const char kDisableMapImage[];
 
 // Switches for both the renderer and ui compositors.
 CC_EXPORT extern const char kUIDisablePartialSwap[];
+CC_EXPORT extern const char kDisableDeadlineScheduling[];
+CC_EXPORT extern const char kEnableDeadlineScheduling[];
 CC_EXPORT extern const char kEnablePerTilePainting[];
 CC_EXPORT extern const char kUIEnablePerTilePainting[];
 
@@ -69,6 +71,7 @@ CC_EXPORT extern const char kUIShowNonOccludingRects[];
 CC_EXPORT extern const char kCCLayerTreeTestNoTimeout[];
 
 CC_EXPORT bool IsLCDTextEnabled();
+CC_EXPORT bool IsDeadlineSchedulingEnabled();
 CC_EXPORT bool IsImplSidePaintingEnabled();
 CC_EXPORT bool IsMapImageEnabled();