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

chrome/browser/android/offline_pages/prerendering_loader.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_PRERENDERING_LOADER_H_
 #define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_PRERENDERING_LOADER_H_
 
 #include <memory>
 
 #include "base/callback.h"
@@ skipping 14 matching lines @@
 // the page loading in the background. It operates on a single thread and
 // needs to run on BrowserThread::UI to work with the PrerenderManager.
 // It supports a single load request at a time.
 class PrerenderingLoader : public PrerenderAdapter::Observer,
                            public SnapshotController::Client {
  public:
   // Reports status of a load page request with loaded contents if available.
   typedef base::Callback<void(Offliner::RequestStatus, content::WebContents*)>
       LoadPageCallback;
 
+  typedef base::Callback<void(int64_t)> ProgressCallback;
+
   explicit PrerenderingLoader(content::BrowserContext* browser_context);
   ~PrerenderingLoader() override;
 
   // Loads a page in the background if possible and returns whether the
   // request was accepted. If so, the LoadPageCallback will be informed
   // of status. Only one load request may exist as a time. If a previous
   // request is still in progress it must be stopped before a new
   // request will be accepted. The callback may be called more than
   // once - first for a successful load and then if canceled after the
   // load (which may be from resources being reclaimed) at which point
   // the retrieved WebContents should no longer be used.
-  virtual bool LoadPage(const GURL& url, const LoadPageCallback& callback);
+  virtual bool LoadPage(const GURL& url,
+                        const LoadPageCallback& load_done_callback,
+                        const ProgressCallback& progress_callback);
 
   // Stops (completes or cancels) the load request. Must be called when
   // LoadPageCallback is done with consuming the contents. May be called
   // prior to LoadPageCallback in order to cancel the current request (in
   // which case the callback will not be run).
   // This loader should also be responsible for stopping offline
   // prerenders when Chrome is transitioned to foreground.
   virtual void StopLoading();
 
   // Returns whether the loader is idle and able to accept new LoadPage
   // request.
   virtual bool IsIdle();
 
   // Returns whether the loader has successfully loaded web contents.
   // Note that |StopLoading()| should be used to clear this state once
   // the loaded web contents are no longer needed.
   virtual bool IsLoaded();
 
   // Overrides the prerender stack adapter for unit testing.
   void SetAdapterForTesting(
       std::unique_ptr<PrerenderAdapter> prerender_adapter);
 
   // PrerenderAdapter::Observer implementation:
   void OnPrerenderStopLoading() override;
   void OnPrerenderDomContentLoaded() override;
   void OnPrerenderStop() override;
+  void OnPrerenderNetworkBytesChanged(int64_t bytes) override;
 
   // SnapshotController::Client implementation:
   void StartSnapshot() override;
 
  private:
   // State of the loader (only one request may be active at a time).
   enum class State {
     IDLE,     // No active load request.
     PENDING,  // Load request is pending the start of prerendering.
     LOADING,  // Loading in progress.
@@ skipping 24 matching lines @@
 
   // Adapter for handling calls to the prerender stack.
   std::unique_ptr<PrerenderAdapter> adapter_;
 
   // A WebContents for the active load request that is used to hold the session
   // storage namespace for rendering. This will NOT have the loaded page.
   std::unique_ptr<content::WebContents> session_contents_;
 
   // Callback to call when the active load request completes, fails, or is
   // canceled.
-  LoadPageCallback callback_;
+  LoadPageCallback load_done_callback_;
+
+  // Callback to call when we know more bytes have loaded from the network.
+  ProgressCallback progress_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderingLoader);
 };
 
 }  // namespace offline_pages
 
 #endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_PRERENDERING_LOADER_H_