[Offline Pages] Make prerenderer notify us of network progress.

chrome/browser/prerender/prerender_contents.h

 // Copyright (c) 2012 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_PRERENDER_PRERENDER_CONTENTS_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_CONTENTS_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 71 matching lines @@
     virtual void OnPrerenderStopLoading(PrerenderContents* contents) {}
 
     // Signals that the prerender has had its 'DOMContentLoaded' event.
     virtual void OnPrerenderDomContentLoaded(PrerenderContents* contents) {}
 
     // Signals that the prerender has stopped running. A PrerenderContents with
     // an unset final status will always call OnPrerenderStop before being
     // destroyed.
     virtual void OnPrerenderStop(PrerenderContents* contents) {}
 
+    // Signals that a resource finished loading and altered the running byte
+    // count.
+    virtual void OnPrerenderNetworkBytesChanged(PrerenderContents* contents) {}
+
    protected:
     Observer() {}
     virtual ~Observer() = 0;
   };
 
   ~PrerenderContents() override;
 
   // All observers of a PrerenderContents are removed after the OnPrerenderStop
   // event is sent, so there is no need to call RemoveObserver() in the normal
   // use case.
@@ skipping 129 matching lines @@
   void AddResourceThrottle(
       const base::WeakPtr<PrerenderResourceThrottle>& throttle);
 
   // Increments the number of bytes fetched over the network for this prerender.
   void AddNetworkBytes(int64_t bytes);
 
   bool prerendering_has_been_cancelled() const {
     return prerendering_has_been_cancelled_;
   }
 
+  // Running byte count. Increased when each resource completes loading.
+  int64_t network_bytes() { return network_bytes_; }
+
  protected:
   PrerenderContents(PrerenderManager* prerender_manager,
                     Profile* profile,
                     const GURL& url,
                     const content::Referrer& referrer,
                     Origin origin);
 
   // Set the final status for how the PrerenderContents was used. This
   // should only be called once, and should be called before the prerender
   // contents are destroyed.
@@ skipping 120 matching lines @@
   int64_t network_bytes_;
 
   base::WeakPtrFactory<PrerenderContents> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderContents);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_CONTENTS_H_