WIP - compositor worker mega patch.

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 a9e991c64e7d1c61f3fbbb672173d8fc97cf2dec..a56765ae6a6648fb2291401f15f4211112e5e0ff 100644
--- a/cc/trees/proxy_common.h
+++ b/cc/trees/proxy_common.h
@@ -7,6 +7,8 @@
 
 #include <stddef.h>
 
+#include "cc/animation/layer_tree_mutation.h"
+
 #include "cc/base/cc_export.h"
 #include "cc/output/begin_frame_args.h"
 #include "cc/trees/layer_tree_host_common.h"
@@ -21,6 +23,7 @@ struct CC_EXPORT BeginMainFrameAndCommitState {
   unsigned int begin_frame_id;
   BeginFrameArgs begin_frame_args;
   scoped_ptr<ScrollAndScaleSet> scroll_info;
+  scoped_ptr<LayerTreeMutationMap> mutations;
   size_t memory_allocation_limit_bytes;
   bool evicted_ui_resources;
 };