WIP - compositor worker mega patch.

cc/animation/mutable_properties.h

Index: cc/animation/mutable_properties.h
diff --git a/cc/animation/mutable_properties.h b/cc/animation/mutable_properties.h
index dfe06b69452228506e940112a5217fe879c164a5..cd17930e3b8ff409b88e1dcc82f06a34582b5358 100644
--- a/cc/animation/mutable_properties.h
+++ b/cc/animation/mutable_properties.h
@@ -7,12 +7,21 @@
 
 namespace cc {
 
+// TODO(vollick): we can remove this once we're building property trees in
+// blink. We're using this in two places in cc currently. 1) to populate the
+// LayerTreeImpl's element map, and 2) to figure out when we need to add
+// property tree nodes for proxied layers. We can address 1) simply by moving
+// the storage to blink, and 2) will naturally happen as property construction
+// moves to blink.
 enum MutableProperty {
   kMutablePropertyNone = 0,
   kMutablePropertyOpacity = 1 << 0,
   kMutablePropertyScrollLeft = 1 << 1,
   kMutablePropertyScrollTop = 1 << 2,
   kMutablePropertyTransform = 1 << 3,
+  kMutablePropertyTransformRelated = kMutablePropertyTransform |
+                                     kMutablePropertyScrollLeft |
+                                     kMutablePropertyScrollTop,
 };
 
 }  // namespace cc