Route IME-related IPCs to the active/focused RenderWidget (Mac)

content/browser/renderer_host/render_widget_host_view_mac.h

Index: content/browser/renderer_host/render_widget_host_view_mac.h
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.h b/content/browser/renderer_host/render_widget_host_view_mac.h
index fbcb7742a64986bd2b3d0f3aa8aa09f3fe2ff5f4..9e6ac3c619ad01b74616b660ca599b9dd697cb1d 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.h
+++ b/content/browser/renderer_host/render_widget_host_view_mac.h
@@ -474,6 +474,11 @@ class CONTENT_EXPORT RenderWidgetHostViewMac
   // TextInputManager.
   ui::TextInputType GetTextInputType();
 
+  // Helper method to obtain the currently active widget from TextInputManager.
+  // An active widget is a RenderWidget which is currently focused and has a
+  // |TextInputState.type| which is not ui::TEXT_INPUT_TYPE_NONE.
+  RenderWidgetHostImpl* GetActiveWidget();
+
  private:
   friend class RenderWidgetHostViewMacTest;