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

chrome/browser/android/offline_pages/prerender_adapter.cc

 // 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.
 
 #include "chrome/browser/android/offline_pages/prerender_adapter.h"
 
 #include "chrome/browser/prerender/prerender_manager.h"
 #include "chrome/browser/prerender/prerender_manager_factory.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/web_contents.h"
@@ skipping 84 matching lines @@
   observer_->OnPrerenderDomContentLoaded();
 }
 
 void PrerenderAdapter::OnPrerenderStop(prerender::PrerenderHandle* handle) {
   if (IsActive()) {
     DCHECK_EQ(active_handle_.get(), handle);
     observer_->OnPrerenderStop();
   }
 }
 
+void PrerenderAdapter::OnPrerenderNetworkBytesChanged(
+    prerender::PrerenderHandle* handle) {
+  if (IsActive()) {
+    DCHECK_EQ(active_handle_.get(), handle);
+    prerender::PrerenderContents* contents = handle->contents();
+    if (!contents)
+      return;
+    observer_->OnPrerenderNetworkBytesChanged(contents->network_bytes());
+  }
+}
+
 }  // namespace offline_pages