Fix the loading progress bar for Android.

content/browser/web_contents/web_contents_impl.cc

 // 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.
 
 #include "content/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
@@ skipping 1975 matching lines @@
     int64 parent_frame_id,
     bool is_main_frame,
     const GURL& url) {
   bool is_error_page = (url.spec() == kUnreachableWebDataURL);
   bool is_iframe_srcdoc = (url.spec() == chrome::kAboutSrcDocURL);
   GURL validated_url(url);
   RenderProcessHost* render_process_host =
       render_view_host->GetProcess();
   RenderViewHost::FilterURL(render_process_host, false, &validated_url);
 
+  if (is_main_frame)
+    DidChangeLoadProgress(0);
+
   // Notify observers about the start of the provisional load.
   FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                     DidStartProvisionalLoadForFrame(frame_id, parent_frame_id,
                     is_main_frame, validated_url, is_error_page,
                     is_iframe_srcdoc, render_view_host));
 
   if (is_main_frame) {
     // Notify observers about the provisional change in the main frame URL.
     FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                       ProvisionalChangeToMainFrameUrl(validated_url,
@@ skipping 1392 matching lines @@
 
 BrowserPluginGuest* WebContentsImpl::GetBrowserPluginGuest() {
   return browser_plugin_guest_.get();
 }
 
 BrowserPluginEmbedder* WebContentsImpl::GetBrowserPluginEmbedder() {
   return browser_plugin_embedder_.get();
 }
 
 }  // namespace content