cc: Introduce BeginFrame sequence numbers and acknowledgements.

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 831a37e1aac11fc312b1de385327c7b5a6ce4512..694bf167a888abbe147177525043e83d9fb2bbe4 100644
--- a/cc/ipc/cc_param_traits_macros.h
+++ b/cc/ipc/cc_param_traits_macros.h
@@ -154,12 +154,22 @@ IPC_ENUM_TRAITS_MAX_VALUE(cc::BeginFrameArgs::BeginFrameArgsType,
                           cc::BeginFrameArgs::BEGIN_FRAME_ARGS_TYPE_MAX - 1)
 
 IPC_STRUCT_TRAITS_BEGIN(cc::BeginFrameArgs)
+  IPC_STRUCT_TRAITS_MEMBER(source_id)
+  IPC_STRUCT_TRAITS_MEMBER(sequence_number)
   IPC_STRUCT_TRAITS_MEMBER(frame_time)
   IPC_STRUCT_TRAITS_MEMBER(deadline)
   IPC_STRUCT_TRAITS_MEMBER(interval)
   IPC_STRUCT_TRAITS_MEMBER(type)
 IPC_STRUCT_TRAITS_END()
 
+IPC_STRUCT_TRAITS_BEGIN(cc::BeginFrameAck)
+  IPC_STRUCT_TRAITS_MEMBER(source_id)
+  IPC_STRUCT_TRAITS_MEMBER(sequence_number)
+  IPC_STRUCT_TRAITS_MEMBER(oldest_incorporated_frame)
+  IPC_STRUCT_TRAITS_MEMBER(remaining_frames)
+  IPC_STRUCT_TRAITS_MEMBER(has_updates)
+IPC_STRUCT_TRAITS_END()
+
 IPC_STRUCT_TRAITS_BEGIN(cc::CompositorFrameMetadata)
   IPC_STRUCT_TRAITS_MEMBER(device_scale_factor)
   IPC_STRUCT_TRAITS_MEMBER(root_scroll_offset)
@@ -183,6 +193,9 @@ IPC_STRUCT_TRAITS_BEGIN(cc::CompositorFrameMetadata)
   IPC_STRUCT_TRAITS_MEMBER(latency_info)
   IPC_STRUCT_TRAITS_MEMBER(satisfies_sequences)
   IPC_STRUCT_TRAITS_MEMBER(referenced_surfaces)
+  IPC_STRUCT_TRAITS_MEMBER(begin_frame_source_id)
+  IPC_STRUCT_TRAITS_MEMBER(begin_frame_number)
+  IPC_STRUCT_TRAITS_MEMBER(oldest_incorporated_frame)
 IPC_STRUCT_TRAITS_END()
 
 #endif  // CC_IPC_CC_PARAM_TRAITS_MACROS_H_