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 faf1288af88cf568f3eea5fc8e6a4b527900cf6a..258571aebe515d4f8e4a23c0a23a347327b6c0b5 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;
@@ -688,6 +689,11 @@ 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);
 
@@ -1269,6 +1275,14 @@ class CONTENT_EXPORT RenderFrameImpl
   PepperPluginInstanceImpl* pepper_last_mouse_event_target_;
 #endif
 
+#if defined(OS_MACOSX)
+  // TODO(ekaramad): TextInputClientObserver should be in RenderWidget. We can't
+  // do this now since we need access to WebViewImpl. Remove this once the logic
+  // is fully moved to RenderWidget.
+  // 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_;