cc: Add strict layer property change checking and handle bounds changes during paint.

cc/base/switches.cc

Index: cc/base/switches.cc
diff --git a/cc/base/switches.cc b/cc/base/switches.cc
index c2290705b7b6907876aa871d97b982139df9ef38..c31695040113352c6b887ae66ba71cffe6ff7455 100644
--- a/cc/base/switches.cc
+++ b/cc/base/switches.cc
@@ -86,6 +86,10 @@ const char kDisablePinchZoomScrollbars[]    = "disable-pinch-zoom-scrollbars";
 // Requires --enable-compositor-frame-message.
 const char kCompositeToMailbox[] = "composite-to-mailbox";
 
+// Check that property changes during paint do not occur.
+const char kStrictLayerPropertyChangeChecking[] =
+    "strict-layer-property-change-checking";
+
 const char kEnablePartialSwap[] = "enable-partial-swap";
 
 const char kEnablePerTilePainting[] = "enable-per-tile-painting";