Plumb ScheduleOverlayPlane into the GPU process.

gpu/command_buffer/build_gles2_cmd_buffer.py

Index: gpu/command_buffer/build_gles2_cmd_buffer.py
diff --git a/gpu/command_buffer/build_gles2_cmd_buffer.py b/gpu/command_buffer/build_gles2_cmd_buffer.py
index 1754704ebb9588cea1bb681328766847e3a3e868..2b56942aa4ca76dd3e5b0b64d1b470cabc2540aa 100755
--- a/gpu/command_buffer/build_gles2_cmd_buffer.py
+++ b/gpu/command_buffer/build_gles2_cmd_buffer.py
@@ -2538,6 +2538,14 @@ _FUNCTION_INFO = {
     'extension': True,
     'chromium': True,
   },
+  'ScheduleOverlayPlaneCHROMIUM': {
+      'type': 'Custom',
+      'impl_func': True,
+      'unit_test': False,
+      'client_test': False,
+      'extension': True,
+      'chromium': True,
+  },
 }