Add support for all blendmodes if we have GL_KHR_blend_equation_advanced.

gpu/command_buffer/client/gles2_cmd_helper_autogen.h

Index: gpu/command_buffer/client/gles2_cmd_helper_autogen.h
diff --git a/gpu/command_buffer/client/gles2_cmd_helper_autogen.h b/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
index c8432dabd0ac2dc6b94e05627a4a24fdb30f7a68..24d8be24c6b121cb2701156dd90e8327876885df 100644
--- a/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
+++ b/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
@@ -1929,4 +1929,11 @@ void MatrixLoadIdentityCHROMIUM(GLenum matrixMode) {
   }
 }
 
+void BlendBarrierKHR() {
+  gles2::cmds::BlendBarrierKHR* c = GetCmdSpace<gles2::cmds::BlendBarrierKHR>();
+  if (c) {
+    c->Init();
+  }
+}
+
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_CMD_HELPER_AUTOGEN_H_