GPU process clients can perform a "shallow" finish.

gpu/command_buffer/build_gles2_cmd_buffer.py

Index: gpu/command_buffer/build_gles2_cmd_buffer.py
===================================================================
--- gpu/command_buffer/build_gles2_cmd_buffer.py	(revision 207109)
+++ gpu/command_buffer/build_gles2_cmd_buffer.py	(working copy)
@@ -1526,13 +1526,6 @@
     'impl_func': False,
     'decoder_func': 'DoFlush',
   },
-  'ShallowFlushCHROMIUM': {
-    'impl_func': False,
-    'gen_cmd': False,
-    'extension': True,
-    'chromium': True,
-    'client_test': False,
-  },
   'FramebufferRenderbuffer': {
     'decoder_func': 'DoFramebufferRenderbuffer',
     'gl_test_func': 'glFramebufferRenderbufferEXT',
@@ -2362,6 +2355,20 @@
     'extension': True,
     'chromium': True,
   },
+  'ShallowFinishCHROMIUM': {
+    'impl_func': False,
+    'gen_cmd': False,
+    'extension': True,
+    'chromium': True,
+    'client_test': False,
+  },
+  'ShallowFlushCHROMIUM': {
+    'impl_func': False,
+    'gen_cmd': False,
+    'extension': True,
+    'chromium': True,
+    'client_test': False,
+  },
   'TraceBeginCHROMIUM': {
     'type': 'Custom',
     'impl_func': False,