Add ES3 commands GetVertexAttribI{u}iv to GPU command buffer.

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 3f17ae69b15bc30bd2164364bf57241dd5327112..35ce83bc1d9908dd253e99ea4a1f9718ecc196cf 100755
--- a/gpu/command_buffer/build_gles2_cmd_buffer.py
+++ b/gpu/command_buffer/build_gles2_cmd_buffer.py
@@ -1275,6 +1275,10 @@ _NAMED_TYPE_INFO = {
       'GL_VERTEX_ATTRIB_ARRAY_TYPE',
       'GL_CURRENT_VERTEX_ATTRIB',
     ],
+    'valid_es3': [
+      'GL_VERTEX_ATTRIB_ARRAY_INTEGER',
+      'GL_VERTEX_ATTRIB_ARRAY_DIVISOR',
+    ],
   },
   'VertexPointer': {
     'type': 'GLenum',
@@ -2746,6 +2750,24 @@ _FUNCTION_INFO = {
     'expectation': False,
     'client_test': False,
   },
+  'GetVertexAttribIiv': {
+    'type': 'GETn',
+    'result': ['SizedResult<GLint>'],
+    'impl_decl': False,
+    'decoder_func': 'DoGetVertexAttribIiv',
+    'expectation': False,
+    'client_test': False,
+    'unsafe': True,
+  },
+  'GetVertexAttribIuiv': {
+    'type': 'GETn',
+    'result': ['SizedResult<GLuint>'],
+    'impl_decl': False,
+    'decoder_func': 'DoGetVertexAttribIuiv',
+    'expectation': False,
+    'client_test': False,
+    'unsafe': True,
+  },
   'GetVertexAttribPointerv': {
     'type': 'Custom',
     'data_transfer_methods': ['shm'],