compositor-worker: cc->blink mutation plumbing

cc/trees/proxy_common.h

Index: cc/trees/proxy_common.h
diff --git a/cc/trees/proxy_common.h b/cc/trees/proxy_common.h
index 046f1056ea96e0bac347b50943e38610da1e84a6..2bcd077068b0bc1126d72ac4ba8797cfd66540f6 100644
--- a/cc/trees/proxy_common.h
+++ b/cc/trees/proxy_common.h
@@ -7,6 +7,7 @@
 
 #include <stddef.h>
 
+#include "cc/animation/layer_tree_mutations.h"
 #include "cc/base/cc_export.h"
 #include "cc/output/begin_frame_args.h"
 #include "cc/trees/layer_tree_host_common.h"
@@ -26,6 +27,7 @@ struct CC_EXPORT BeginMainFrameAndCommitState {
   unsigned int begin_frame_id;
   BeginFrameArgs begin_frame_args;
   scoped_ptr<ScrollAndScaleSet> scroll_info;
+  scoped_ptr<LayerTreeMutations> mutations;
   size_t memory_allocation_limit_bytes;
   bool evicted_ui_resources;