Add subscribeUniform extension pipeline

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 14191f2273bf1042a61487c1c31e97fef86359e6..73fe8e65427161c4f43f45d68a6e74097af74200 100755
--- a/gpu/command_buffer/build_gles2_cmd_buffer.py
+++ b/gpu/command_buffer/build_gles2_cmd_buffer.py
@@ -1195,6 +1195,12 @@ _NAMED_TYPE_INFO = {
       'GL_SCANOUT_CHROMIUM'
     ],
   },
+  'UniformSubscriptionTarget': {
+    'type': 'GLenum',
+    'valid': [
+      'GL_MOUSE_POSITION',
+    ],
+  },
   'VertexAttribType': {
     'type': 'GLenum',
     'valid': [
@@ -1448,6 +1454,20 @@ _FUNCTION_INFO = {
     'extension': "CHROMIUM_texture_mailbox",
     'chromium': True,
   },
+  'SubscribeUniformCHROMIUM': {
+    'decoder_func': 'DoSubscribeUniformCHROMIUM',
+    'unit_test': False,
+    'extension': True,
+    'chromium': True,
+  },
+  'PopulateSubscribedUniformsCHROMIUM': {
+    'decoder_func': 'DoPopulateSubscribedUniformsCHROMIUM',
+    'impl_func': False,
+    'unit_test': False,
+    'client_test': False,
+    'extension': True,
+    'chromium': True,
+  },
   'ClearStencil': {
     'type': 'StateSet',
     'state': 'ClearStencil',