gpu: Add async upload functions.

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 ecd62a8d5f4c637b27bdfb006a124e4222f017cd..88a37451f1d97e7ac2d621b481e88feddba7fc5b 100755
--- a/gpu/command_buffer/build_gles2_cmd_buffer.py
+++ b/gpu/command_buffer/build_gles2_cmd_buffer.py
@@ -777,6 +777,7 @@ _ENUM_LISTS = {
       'GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT',
       'GL_COMMANDS_ISSUED_CHROMIUM',
       'GL_LATENCY_QUERY_CHROMIUM',
+      'GL_ASYNC_PIXEL_TRANSFERS_COMPLETED_CHROMIUM',
     ],
   },
   'RenderBufferParameter': {
@@ -2239,6 +2240,20 @@ _FUNCTION_INFO = {
     'extension': True,
     'chromium': True,
   },
+  'AsyncTexImage2DCHROMIUM': {
+    'type': 'Manual',
+    'immediate': False,
+    'client_test': False,
+    'extension': True,
+    'chromium': True,
+  },
+  'AsyncTexSubImage2DCHROMIUM': {
+    'type': 'Manual',
+    'immediate': False,
+    'client_test': False,
+    'extension': True,
+    'chromium': True,
+  },
 }