In cl https://codereview.chromium.org/2708153005/, when git cl upload, it will prompts: 
presubmit warnings:  The src directory requires source formatting. Please run git cl format 

If run git cl format, it will format file content/browser/renderer_host/offscreen_canvas_surface_manager_unittest.cc and move  
#include "content/browser/renderer_host/offscreen_canvas_surface_manager.h" to
the first line.

However, for file offscreen_canvas_surface_manager_unittest.cc, it doesn't have a offscreen_canvas_surface_manager_unittest.h. 

So suggest git cl format take .cc file without .h as a special case.