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

chrome/browser/android/offline_pages/prerender_adapter.h

 // Copyright 2016 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_ANDROID_OFFLINE_PAGES_PRERENDER_ADAPTER_H_
 #define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_PRERENDER_ADAPTER_H_
 
 #include <memory>
 
 #include "chrome/browser/prerender/prerender_handle.h"
@@ skipping 22 matching lines @@
     // Signals that the prerender has had its load event.
     virtual void OnPrerenderStopLoading() = 0;
 
     // Signals that the prerender has had its 'DOMContentLoaded' event.
     virtual void OnPrerenderDomContentLoaded() = 0;
 
     // Signals that the prerender has stopped running and any retrieved
     // WebContents (via |GetWebContents()|) have become invalidated.
     virtual void OnPrerenderStop() = 0;
 
+    // Signals that a resource finished loading and altered the running byte

[Pete Williamson, 2017/02/15 01:17:45]

is bytes a cumulative total of bytes loaded, or new bytes since last callback?

[dewittj, 2017/02/17 23:20:15]

This is a cumulative total.  Will update the comment.

+    // count.
+    virtual void OnNetworkBytesChanged(int64_t bytes) = 0;
+
    protected:
     Observer();
     virtual ~Observer();
   };
 
   explicit PrerenderAdapter(PrerenderAdapter::Observer* observer);
   ~PrerenderAdapter() override;
 
   // Starts prerendering |url| for offlining. There must be no active
   // prerender request when calling this. Returns whether it was able
@@ skipping 23 matching lines @@
   virtual bool IsActive() const;
 
   // Cancels any current prerendering operation and destroys its local handle.
   virtual void DestroyActive();
 
   // PrerenderHandle::Observer interface:
   void OnPrerenderStart(prerender::PrerenderHandle* handle) override;
   void OnPrerenderStopLoading(prerender::PrerenderHandle* handle) override;
   void OnPrerenderDomContentLoaded(prerender::PrerenderHandle* handle) override;
   void OnPrerenderStop(prerender::PrerenderHandle* handle) override;
+  void OnNetworkBytesChanged(prerender::PrerenderHandle* handle) override;
 
  private:
   // At most one prerender request may be active for this adapter and this
   // holds its handle if one is active.
   std::unique_ptr<prerender::PrerenderHandle> active_handle_;
 
   // Observer of active handle events. Not owned.
   PrerenderAdapter::Observer* observer_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderAdapter);
 };
 
 }  // namespace offline_pages
 
 #endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_PRERENDER_ADAPTER_H_