Get FileSelect dialog work on athena

athena/activity/public/activity.h

Index: athena/activity/public/activity.h
diff --git a/athena/activity/public/activity.h b/athena/activity/public/activity.h
index bd7df61f31b384f80a18b11deaef726c122ba796..54ed832c99bc7518a42886766b37b9608c7867c7 100644
--- a/athena/activity/public/activity.h
+++ b/athena/activity/public/activity.h
@@ -13,6 +13,10 @@ namespace aura {
 class Window;
 }
 
+namespace content {
+class WebContents;
+}
+
 namespace athena {
 
 class ActivityViewModel;
@@ -89,6 +93,10 @@ class ATHENA_EXPORT Activity {
   // which has Show/ShowInactive and other control methods.
   virtual aura::Window* GetWindow() = 0;
 
+  // Returns the web contents used to draw the content of the activity.
+  // This may return NULL if the web content is not available.
+  virtual content::WebContents* GetWebContents() = 0;
+
  protected:
   virtual ~Activity() {}
 };