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

ui/views/controls/textfield/textfield.h

Index: ui/views/controls/textfield/textfield.h
diff --git a/ui/views/controls/textfield/textfield.h b/ui/views/controls/textfield/textfield.h
index c6dd5c11eaa2def01c015a62a224062858bb2549..21dcca1a578fd0b1d316d46510e8f17aded8487b 100644
--- a/ui/views/controls/textfield/textfield.h
+++ b/ui/views/controls/textfield/textfield.h
@@ -30,6 +30,7 @@
 #include "ui/views/controls/textfield/textfield_model.h"
 #include "ui/views/drag_controller.h"
 #include "ui/views/view.h"
+#include "ui/views/word_lookup_client.h"
 
 namespace views {
 
@@ -42,6 +43,7 @@ class VIEWS_EXPORT Textfield : public View,
                                public TextfieldModel::Delegate,
                                public ContextMenuController,
                                public DragController,
+                               public WordLookupClient,
                                public ui::TouchEditable,
                                public ui::TextInputClient {
  public:
@@ -213,6 +215,7 @@ class VIEWS_EXPORT Textfield : public View,
   bool OnMousePressed(const ui::MouseEvent& event) override;
   bool OnMouseDragged(const ui::MouseEvent& event) override;
   void OnMouseReleased(const ui::MouseEvent& event) override;
+  WordLookupClient* GetWordLookupClient() override;
   void OnGestureEvent(ui::GestureEvent* event) override;
   bool AcceleratorPressed(const ui::Accelerator& accelerator) override;
   bool CanHandleAccelerators() const override;
@@ -254,6 +257,11 @@ class VIEWS_EXPORT Textfield : public View,
                            const gfx::Point& press_pt,
                            const gfx::Point& p) override;
 
+  // WordLookupClient overrides:
+  bool GetDecoratedWordAtPoint(const gfx::Point& point,
+                               gfx::DecoratedText* decorated_word,
+                               gfx::Point* baseline_point) override;
+
   // ui::TouchEditable overrides:
   void SelectRect(const gfx::Point& start, const gfx::Point& end) override;
   void MoveCaretTo(const gfx::Point& point) override;