Use Widget frame and WidgetDelegate in ActvityWidget

athena/content/app_activity.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 "athena/content/app_activity.h"
 
 #include "apps/shell/browser/shell_app_window.h"
 #include "athena/activity/public/activity_manager.h"
 #include "content/public/browser/web_contents.h"
 #include "ui/views/controls/webview/webview.h"
 
 namespace athena {
 
 // TODO(mukai): specifies the same accelerators of WebActivity.
 AppActivity::AppActivity(apps::ShellAppWindow* app_window)
     : app_window_(app_window), web_view_(NULL) {
   DCHECK(app_window_);
 }
 
 AppActivity::~AppActivity() {
 }
 
 ActivityViewModel* AppActivity::GetActivityViewModel() {
   return this;
 }
 
 void AppActivity::Init() {
 }
 
-SkColor AppActivity::GetRepresentativeColor() {
+SkColor AppActivity::GetRepresentativeColor() const {
   // TODO(sad): Compute the color from the favicon.
   return SK_ColorGRAY;
 }
 
-base::string16 AppActivity::GetTitle() {
+base::string16 AppActivity::GetTitle() const {
   return web_view_->GetWebContents()->GetTitle();
 }
 
+bool AppActivity::UsesFrame() const {
+  return false;
+}
+
 views::View* AppActivity::GetContentsView() {
   if (!web_view_) {
+    // TODO(oshima): use apps::NativeAppWindowViews
     content::WebContents* web_contents =
         app_window_->GetAssociatedWebContents();
     web_view_ = new views::WebView(web_contents->GetBrowserContext());
     web_view_->SetWebContents(web_contents);
     Observe(web_contents);
   }
   return web_view_;
 }
 
 void AppActivity::TitleWasSet(content::NavigationEntry* entry,
                               bool explicit_set) {
   ActivityManager::Get()->UpdateActivity(this);
 }
 
 void AppActivity::DidUpdateFaviconURL(
     const std::vector<content::FaviconURL>& candidates) {
   ActivityManager::Get()->UpdateActivity(this);
 }
 
 }  // namespace athena