Implement support for Mac Zoom following focus and caret

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 59579822a5d5aba35cca6d9d17623fd83ceac010..a7314da520a53de1004b9db2cd8932af15136781 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.h
+++ b/content/browser/renderer_host/render_widget_host_view_mac.h
@@ -302,6 +302,8 @@ class CONTENT_EXPORT RenderWidgetHostViewMac
       std::unique_ptr<RenderWidgetHostViewFrameSubscriber> subscriber) override;
   void EndFrameSubscription() override;
   ui::AcceleratedWidgetMac* GetAcceleratedWidgetMac() const override;
+  void FocusedNodeChanged(bool is_editable_node,
+                          const gfx::Rect& node_bounds_in_screen) override;
   void OnSwapCompositorFrame(uint32_t compositor_frame_sink_id,
                              cc::CompositorFrame frame) override;
   void ClearCompositorFrame() override;
@@ -353,6 +355,9 @@ class CONTENT_EXPORT RenderWidgetHostViewMac
   void OnImeCompositionRangeChanged(
       TextInputManager* text_input_manager,
       RenderWidgetHostViewBase* updated_view) override;
+  void OnSelectionBoundsChanged(
+      TextInputManager* text_input_manager,
+      RenderWidgetHostViewBase* updated_view) override;
   void OnTextSelectionChanged(TextInputManager* text_input_manager,
                               RenderWidgetHostViewBase* updated_view) override;
   // IPC::Sender implementation.
@@ -491,6 +496,9 @@ class CONTENT_EXPORT RenderWidgetHostViewMac
   // Dispatches a TTS session.
   void SpeakText(const std::string& text);
 
+  // Get the focused view that should be used for retrieving the text selection.
+  RenderWidgetHostViewBase* GetFocusedViewForTextSelection();
+
   // The associated view. This is weak and is inserted into the view hierarchy
   // to own this RenderWidgetHostViewMac object. Set to nil at the start of the
   // destructor.