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

cc/layers/paint_properties.h

Index: cc/layers/paint_properties.h
diff --git a/cc/layers/paint_properties.h b/cc/layers/paint_properties.h
new file mode 100644
index 0000000000000000000000000000000000000000..9b936980c4f8fc489496cb55d281141c2194ce13
--- /dev/null
+++ b/cc/layers/paint_properties.h
@@ -0,0 +1,21 @@
+// Copyright 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CC_LAYERS_PAINT_PROPERTIES_H_
+#define CC_LAYERS_PAINT_PROPERTIES_H_
+
+#include "ui/gfx/size.h"
+
+namespace cc {
+
+// Container for properties that layers need to save before they can be paint.
+struct CC_EXPORT PaintProperties {
+  PaintProperties() {}
+
+  gfx::Size bounds;
+};
+
+}  // namespace cc
+
+#endif  // CC_LAYERS_PAINT_PROPERTIES_H_