[NotLanded] Implement the fetching algorithm of the Web Manifest.

public/web/WebFrame.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 48 matching lines @@
 class OpenedFrameTracker;
 class WebData;
 class WebDataSource;
 class WebDocument;
 class WebElement;
 class WebFormElement;
 class WebFrameClient;
 class WebInputElement;
 class WebLayer;
 class WebLocalFrame;
+class WebManifestRequest;
 class WebPerformance;
 class WebPermissionClient;
 class WebRange;
 class WebRemoteFrame;
 class WebSecurityOrigin;
 class WebSharedWorkerRepositoryClient;
 class WebString;
 class WebURL;
 class WebURLLoader;
 class WebURLRequest;
@@ skipping 583 matching lines @@
     virtual WebRect selectionBoundsRect() const = 0;
 
     // Only for testing purpose:
     // Returns true if selection.anchorNode has a marker on range from |from| with |length|.
     virtual bool selectionStartHasSpellingMarkerFor(int from, int length) const = 0;
 
     // Dumps the layer tree, used by the accelerated compositor, in
     // text form. This is used only by layout tests.
     virtual WebString layerTreeAsText(bool showDebugInfo = false) const = 0;
 
+    // Manifest ------------------------------------------------------------
+
+    // Starts fetching and parsing the manifest. The passed WebManifestRequest
+    // will get notified when the request ends, whether it failed or succeeded.
+    virtual void requestManifest(WebManifestRequest&) const = 0;
+
 protected:
     explicit WebFrame();
     virtual ~WebFrame();
 
 private:
     friend class OpenedFrameTracker;
 
     WebFrame* m_parent;
     WebFrame* m_previousSibling;
     WebFrame* m_nextSibling;
     WebFrame* m_firstChild;
     WebFrame* m_lastChild;
 
     WebFrame* m_opener;
     WebPrivateOwnPtr<OpenedFrameTracker> m_openedFrameTracker;
 };
 
 } // namespace blink
 
 #endif