MacViews: Handle Space and Return keys correctly for Buttons.

ui/views/style/platform_style.h

 // Copyright 2015 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_STYLE_PLATFORM_STYLE_H_
 #define UI_VIEWS_STYLE_PLATFORM_STYLE_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 28 matching lines @@
 
   // Whether the default button for a dialog can be the Cancel button.
   static const bool kDialogDefaultButtonCanBeCancel;
 
   // Whether right clicking on text, selects the word under cursor.
   static const bool kSelectWordOnRightClick;
 
   // The menu button's action to show the menu.
   static const CustomButton::NotifyAction kMenuNotifyActivationAction;
 
+  // Whether the Space key clicks a button on key press or key release.
+  static const CustomButton::KeyClickAction kKeyClickActionOnSpace;
+
+  // Whether the Return key clicks the focused control (on key press).
+  // Otherwise, Return does nothing unless it is handled by an accelerator.
+  static const bool kReturnClicksFocusedControl;
+
   // Whether TreeViews get a focus ring on the entire TreeView when focused.
   static const bool kTreeViewHasFocusRing;
 
   // Whether selecting a row in a TreeView selects the entire row or only the
   // label for that row.
   static const bool kTreeViewSelectionPaintsEntireRow;
 
   // Whether ripples should be used for visual feedback on control activation.
   static const bool kUseRipples;
 
@@ skipping 29 matching lines @@
   // the failed edit if platform-appropriate.
   static void OnTextfieldEditFailed();
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PlatformStyle);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_STYLE_PLATFORM_STYLE_H_