[cc] Pass on BeginFrameAcks from CompositorEBFS through RWHVAura, DFH.

cc/ipc/cc_param_traits_macros.h

Index: cc/ipc/cc_param_traits_macros.h
diff --git a/cc/ipc/cc_param_traits_macros.h b/cc/ipc/cc_param_traits_macros.h
index 42e97e419e13449a165990f1b0f48beaee13e291..e2a6a8d971abf6c4a88ee93708cf74f1ee6b9230 100644
--- a/cc/ipc/cc_param_traits_macros.h
+++ b/cc/ipc/cc_param_traits_macros.h
@@ -175,6 +175,14 @@ IPC_STRUCT_TRAITS_BEGIN(cc::BeginFrameArgs)
   IPC_STRUCT_TRAITS_MEMBER(type)
 IPC_STRUCT_TRAITS_END()
 
+IPC_STRUCT_TRAITS_BEGIN(cc::BeginFrameAck)
+  IPC_STRUCT_TRAITS_MEMBER(sequence_number)
+  IPC_STRUCT_TRAITS_MEMBER(latest_confirmed_sequence_number)
+  IPC_STRUCT_TRAITS_MEMBER(source_id)
+  IPC_STRUCT_TRAITS_MEMBER(remaining_frames)
+  IPC_STRUCT_TRAITS_MEMBER(has_damage)
+IPC_STRUCT_TRAITS_END()
+
 IPC_STRUCT_TRAITS_BEGIN(cc::CompositorFrameMetadata)
   IPC_STRUCT_TRAITS_MEMBER(device_scale_factor)
   IPC_STRUCT_TRAITS_MEMBER(root_scroll_offset)
@@ -198,6 +206,7 @@ IPC_STRUCT_TRAITS_BEGIN(cc::CompositorFrameMetadata)
   IPC_STRUCT_TRAITS_MEMBER(latency_info)
   IPC_STRUCT_TRAITS_MEMBER(referenced_surfaces)
   IPC_STRUCT_TRAITS_MEMBER(content_source_id)
+  IPC_STRUCT_TRAITS_MEMBER(begin_frame_ack)

[Fady Samuel, 2017/03/10 16:39:30]

Please update mojoms too!

[danakj, 2017/03/10 16:40:46]

Maybe you can write a presubmit, or some comments, to help people (and
reviewers) remember this

[Eric Seckler, 2017/03/14 11:13:41]

Updated the mojoms.

 IPC_STRUCT_TRAITS_END()
 
 #endif  // CC_IPC_CC_PARAM_TRAITS_MACROS_H_