Implement Mac Pop-up Dictionary for OOPIF.

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index c39992face155de1b11226c08d582abe13289e72..ab2ca52527d7b22368427f526378af87b468310a 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -149,6 +149,7 @@ class RenderWidget;
 class RenderWidgetFullscreenPepper;
 class ResourceRequestBodyImpl;
 class ScreenOrientationDispatcher;
+class TextInputClientObserver;
 class UserMediaClientImpl;
 class WakeLockDispatcher;
 struct CommonNavigationParams;
@@ -691,6 +692,11 @@ class CONTENT_EXPORT RenderFrameImpl
   void OnSetPepperVolume(int32_t pp_instance, double volume);
 #endif  // ENABLE_PLUGINS
 
+#if defined(OS_MACOSX)
+  void OnTextInputClientMessageReceived(RenderWidget* render_widget,
+                                        const IPC::Message& message);
+#endif
+
  protected:
   explicit RenderFrameImpl(const CreateParams& params);
 
@@ -1270,6 +1276,11 @@ class CONTENT_EXPORT RenderFrameImpl
   PepperPluginInstanceImpl* pepper_last_mouse_event_target_;
 #endif
 
+#if defined(OS_MACOSX)
+  // The receiver end for TextInputClientMac messages at this local root.
+  std::unique_ptr<TextInputClientObserver> text_input_client_observer_;
+#endif
+
   mojo::Binding<mojom::Frame> frame_binding_;
   mojom::FrameHostPtr frame_host_;