Add GL_CHROMIUM_screen_space_antialiasing to support alternative AA

gpu/command_buffer/service/gles2_cmd_decoder_autogen.h

Index: gpu/command_buffer/service/gles2_cmd_decoder_autogen.h
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_autogen.h b/gpu/command_buffer/service/gles2_cmd_decoder_autogen.h
index 86c3c6720a58b51e9d1889e9bba85decc21831b7..c2d23da213b3576d194ec8a78df217e48f362c6b 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_autogen.h
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_autogen.h
@@ -5086,6 +5086,22 @@ error::Error GLES2DecoderImpl::HandleBlendBarrierKHR(
   return error::kNoError;
 }
 
+error::Error GLES2DecoderImpl::HandleApplyScreenSpaceAntialiasing(
+    uint32_t immediate_data_size,
+    const void* cmd_data) {
+  const gles2::cmds::ApplyScreenSpaceAntialiasing& c =
+      *static_cast<const gles2::cmds::ApplyScreenSpaceAntialiasing*>(cmd_data);
+  (void)c;
+  if (!features().chromium_screen_space_antialiasing) {
+    LOCAL_SET_GL_ERROR(GL_INVALID_OPERATION, "glApplyScreenSpaceAntialiasing",
+                       "function not available");
+    return error::kNoError;
+  }
+
+  DoApplyScreenSpaceAntialiasing();
+  return error::kNoError;
+}
+
 bool GLES2DecoderImpl::SetCapabilityState(GLenum cap, bool enabled) {
   switch (cap) {
     case GL_BLEND: