Implement support for Mac Zoom following focus and caret

content/browser/renderer_host/text_input_manager.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_TEXT_INPUT_MANAGER_H__
 #define CONTENT_BROWSER_RENDERER_HOST_TEXT_INPUT_MANAGER_H__
 
 #include <unordered_map>
 #include <utility>
 
@@ skipping 49 matching lines @@
     virtual void OnTextSelectionChanged(
         TextInputManager* text_input_manager,
         RenderWidgetHostViewBase* updated_view) {}
   };
 
   // Text selection bounds.
   struct SelectionRegion {
     SelectionRegion();
     SelectionRegion(const SelectionRegion& other);
 
-    // The following variables are only used on Aura platforms.
     // The begining of the selection region.
     gfx::SelectionBound anchor;
     // The end of the selection region (caret position).
     gfx::SelectionBound focus;
 
     // The following variables are only used on Mac platform.
     // The current caret bounds.
     gfx::Rect caret_rect;
     // The current first selection bounds.
     gfx::Rect first_selection_rect;
@@ skipping 148 matching lines @@
   ViewMap<CompositionRangeInfo> composition_range_info_map_;
   ViewMap<TextSelection> text_selection_map_;
 
   base::ObserverList<Observer> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(TextInputManager);
 };
 }
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_TEXT_INPUT_MANAGER_H__