List sync points to wait on in AsyncFlush message

gpu/command_buffer/common/command_buffer.h

Index: gpu/command_buffer/common/command_buffer.h
diff --git a/gpu/command_buffer/common/command_buffer.h b/gpu/command_buffer/common/command_buffer.h
index d846ec11a634c1f7bade9440d0a830c1327ce21f..cad9f5b844cb5cfaec95449422f93a510e51bf28 100644
--- a/gpu/command_buffer/common/command_buffer.h
+++ b/gpu/command_buffer/common/command_buffer.h
@@ -87,8 +87,10 @@ class GPU_EXPORT CommandBuffer {
   // The writer calls this to update its put offset. This ensures the reader
   // sees the latest added commands, and will eventually process them. On the
   // service side, commands are processed up to the given put_offset before
-  // subsequent Flushes on the same GpuChannel.
-  virtual void Flush(int32 put_offset) = 0;
+  // subsequent Flushes on the same GpuChannel. sync_points contains the set
+  // of sync points that will be waited on before executing the commands.
+  virtual void Flush(int32 put_offset,
+                     const std::vector<uint32>& sync_points) = 0;
 
   // The writer calls this to wait until the current token is within a
   // specific range, inclusive. Can return early if an error is generated.