Add CanMinimize to classes that implement WidgetDelegate::CanMaximize.

ash/frame/caption_buttons/frame_size_button_unittest.cc

 // Copyright 2014 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.
 
 #include "ash/frame/caption_buttons/frame_size_button.h"
 
 #include "ash/frame/caption_buttons/frame_caption_button.h"
 #include "ash/frame/caption_buttons/frame_caption_button_container_view.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
@@ skipping 22 matching lines @@
   // Overridden from views::WidgetDelegate:
   virtual views::View* GetContentsView() OVERRIDE {
     return this;
   }
   virtual bool CanResize() const OVERRIDE {
     return true;
   }
   virtual bool CanMaximize() const OVERRIDE {
     return true;
   }
+  virtual bool CanMinimize() const OVERRIDE {
+    return true;
+  }
 
   ash::FrameCaptionButtonContainerView* caption_button_container() {
     return caption_button_container_;
   }
 
  private:
   // Overridden from views::View:
   virtual void Layout() OVERRIDE {
     caption_button_container_->Layout();
 
@@ skipping 410 matching lines @@
 
   // None of the buttons should stay pressed and the buttons should have their
   // regular icons.
   EXPECT_TRUE(AllButtonsInNormalState());
   EXPECT_EQ(CAPTION_BUTTON_ICON_MINIMIZE, minimize_button()->icon());
   EXPECT_EQ(CAPTION_BUTTON_ICON_CLOSE, close_button()->icon());
 }
 
 }  // namespace test
 }  // namespace ash