Introduces AppActivity and handler of chrome.shell API.

athena/activity/public/activity_factory.h

Index: athena/activity/public/activity_factory.h
diff --git a/athena/activity/public/activity_factory.h b/athena/activity/public/activity_factory.h
index c617eee774310f5aa8e6257a8ad1c0aeeac607ee..bc95893e2539de907380bfb1ba58b3bd629ab087 100644
--- a/athena/activity/public/activity_factory.h
+++ b/athena/activity/public/activity_factory.h
@@ -8,6 +8,10 @@
 #include "athena/athena_export.h"
 #include "url/gurl.h"
 
+namespace apps {
+class ShellAppWindow;
+}
+
 namespace content {
 class BrowserContext;
 }
@@ -32,9 +36,9 @@ class ATHENA_EXPORT ActivityFactory {
   virtual Activity* CreateWebActivity(content::BrowserContext* browser_context,
                                       const GURL& url) = 0;
 
-  // Create an activity of an app.
-  virtual Activity* CreateAppActivity(content::BrowserContext* browser_context,
-                                      const std::string& app_id) = 0;
+  // Create an activity of an app with |app_window|. The returned activity
+  // should own |app_window|.
+  virtual Activity* CreateAppActivity(apps::ShellAppWindow* app_window) = 0;
 };
 
 }  // namespace athena