Add CommitOverlayPlanesCHROMIUM command buffer function

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 ea859c91515fade60a84027c7711003a3543b508..8076d767925fcf9608afae3cfeeb536eaa71df30 100755
--- a/gpu/command_buffer/build_gles2_cmd_buffer.py
+++ b/gpu/command_buffer/build_gles2_cmd_buffer.py
@@ -4172,6 +4172,14 @@ _FUNCTION_INFO = {
     'extension': 'CHROMIUM_schedule_ca_layer',
     'chromium': True,
   },
+  'CommitOverlayPlanesCHROMIUM': {
+    'type': 'Custom',

[piman, 2015/11/24 01:56:56]

Meh, just leave it as a regular function and get the validation for free!
See SwapBuffers.

[watk, 2015/11/24 21:13:42]

Sounds good.

+    'impl_func': False,

[piman, 2015/11/24 01:56:56]

Why not True?

[watk, 2015/11/24 21:13:42]

I did it like this to mirror SwapBuffers so it's possible to do the same stuff
where it inserts a token, Swaps, Flushes, and waits on the token. I was assuming
CommitOverlayPlanes should do the same thing. (But I don't fully understand why
that's required so.. I'm probably wrong.)

+    'unit_test': False,
+    'client_test': False,
+    'extension': 'CHROMIUM_commit_overlay_planes',
+    'chromium': True,
+  },
   'MatrixLoadfCHROMIUM': {
     'type': 'PUT',
     'count': 16,