MacViews: Implement Force Touch/Mac dictionary lookup for Textfields.

ui/views/view.h

 // Copyright (c) 2012 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 UI_VIEWS_VIEW_H_
 #define UI_VIEWS_VIEW_H_
 
 #include <stddef.h>
 
 #include <algorithm>
@@ skipping 58 matching lines @@
 class Background;
 class Border;
 class ContextMenuController;
 class DragController;
 class FocusManager;
 class FocusTraversable;
 class LayoutManager;
 class NativeViewAccessibility;
 class ScrollView;
 class Widget;
+class WordLookupClient;
 
 namespace internal {
 class PreEventDispatchHandler;
 class PostEventDispatchHandler;
 class RootView;
 }
 
 /////////////////////////////////////////////////////////////////////////////
 //
 // View class
@@ skipping 621 matching lines @@
   std::unique_ptr<ViewTargeter> SetEventTargeter(
       std::unique_ptr<ViewTargeter> targeter);
 
   // Returns the ViewTargeter installed on |this| if one exists,
   // otherwise returns the ViewTargeter installed on our root view.
   // The return value is guaranteed to be non-null.
   ViewTargeter* GetEffectiveViewTargeter() const;
 
   ViewTargeter* targeter() const { return targeter_.get(); }
 
+  // Returns the WordLookupClient associated with this view.
+  virtual WordLookupClient* GetWordLookupClient();
+
   // Overridden from ui::EventTarget:
   bool CanAcceptEvent(const ui::Event& event) override;
   ui::EventTarget* GetParentTarget() override;
   std::unique_ptr<ui::EventTargetIterator> GetChildIterator() const override;
   ui::EventTargeter* GetEventTargeter() override;
   void ConvertEventToTarget(ui::EventTarget* target,
                             ui::LocatedEvent* event) override;
 
   // Overridden from ui::EventHandler:
   void OnKeyEvent(ui::KeyEvent* event) override;
@@ skipping 834 matching lines @@
   // Belongs to this view, but it's reference-counted on some platforms
   // so we can't use a scoped_ptr. It's dereferenced in the destructor.
   NativeViewAccessibility* native_view_accessibility_;
 
   DISALLOW_COPY_AND_ASSIGN(View);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_VIEW_H_