[MacViews] Implement size constraints for app windows.

chrome/browser/ui/views/apps/native_app_window_frame_view_mac.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 CHROME_BROWSER_UI_VIEWS_APPS_NATIVE_APP_WINDOW_FRAME_VIEW_MAC_H_
+#define CHROME_BROWSER_UI_VIEWS_APPS_NATIVE_APP_WINDOW_FRAME_VIEW_MAC_H_
+
+#include "ui/views/window/native_frame_view.h"
+
+class Widget;
+
+// Provides metrics consistent with a native frame on Mac. The actual frame is
+// drawn by NSWindow.
+class NativeAppWindowFrameViewMac : public views::NativeFrameView {
+ public:
+  explicit NativeAppWindowFrameViewMac(views::Widget* frame);
+  ~NativeAppWindowFrameViewMac() override;
+
+  // NonClientFrameView:
+  gfx::Rect GetWindowBoundsForClientBounds(
+      const gfx::Rect& client_bounds) const override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NativeAppWindowFrameViewMac);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_APPS_NATIVE_APP_WINDOW_FRAME_VIEW_MAC_H_