List sync points to wait on in AsyncFlush message

gpu/command_buffer/client/cmd_buffer_helper.h

Index: gpu/command_buffer/client/cmd_buffer_helper.h
diff --git a/gpu/command_buffer/client/cmd_buffer_helper.h b/gpu/command_buffer/client/cmd_buffer_helper.h
index d10a5546ed9abad646ef42849cde9d342d8dd5df..e7f267ae1d4e4212bc9f456f9c708219e70c77e9 100644
--- a/gpu/command_buffer/client/cmd_buffer_helper.h
+++ b/gpu/command_buffer/client/cmd_buffer_helper.h
@@ -290,6 +290,10 @@ class GPU_EXPORT CommandBufferHelper {
     CalcImmediateEntries(0);
   }
 
+  void WillWaitOnSyncPoint(int sync_point) {
+    sync_points_to_wait_on_.push_back(sync_point);
+  }
+
  private:
   // Returns the number of available entries (they may not be contiguous).
   int32 AvailableEntries() {
@@ -320,6 +324,8 @@ class GPU_EXPORT CommandBufferHelper {
   int32 put_;
   int32 last_put_sent_;
 
+  std::vector<uint32> sync_points_to_wait_on_;
+
 #if defined(CMD_HELPER_PERIODIC_FLUSH_CHECK)
   int commands_issued_;
 #endif