Add GL_CHROMIUM_screen_space_antialiasing to support alternative AA

gpu/command_buffer/client/gles2_trace_implementation_impl_autogen.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file is auto-generated from
 // gpu/command_buffer/build_gles2_cmd_buffer.py
 // It's formatted by clang-format using chromium coding style:
 //    clang-format -i -style=chromium filename
 // DO NOT EDIT!
 
@@ skipping 2344 matching lines @@
 GLenum GLES2TraceImplementation::GetGraphicsResetStatusKHR() {
   TRACE_EVENT_BINARY_EFFICIENT0("gpu", "GLES2Trace::GetGraphicsResetStatusKHR");
   return gl_->GetGraphicsResetStatusKHR();
 }
 
 void GLES2TraceImplementation::BlendBarrierKHR() {
   TRACE_EVENT_BINARY_EFFICIENT0("gpu", "GLES2Trace::BlendBarrierKHR");
   gl_->BlendBarrierKHR();
 }
 
+void GLES2TraceImplementation::ApplyScreenSpaceAntialiasing() {
+  TRACE_EVENT_BINARY_EFFICIENT0("gpu",
+                                "GLES2Trace::ApplyScreenSpaceAntialiasing");
+  gl_->ApplyScreenSpaceAntialiasing();
+}
+
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_TRACE_IMPLEMENTATION_IMPL_AUTOGEN_H_