Implement about:tracing UI for the sampling profiler (Chromium part)

content/renderer/render_view_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/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/auto_reset.h"
@@ skipping 2102 matching lines @@
 }
 
 // Tell the embedding application that the title of the active page has changed
 void RenderViewImpl::UpdateTitle(WebFrame* frame,
                                  const string16& title,
                                  WebTextDirection title_direction) {
   // Ignore all but top level navigations.
   if (frame->parent())
     return;
 
+  std::string title_suffix =
+      GetVisibilityState() == WebKit::WebPageVisibilityStatePrerender ?
+      " (Prerender)" : "";
   base::debug::TraceLog::GetInstance()->UpdateProcessLabel(
-      routing_id_, UTF16ToUTF8(title));
+      routing_id_, UTF16ToUTF8(title) + title_suffix);
 
   string16 shortened_title = title.substr(0, kMaxTitleChars);
   Send(new ViewHostMsg_UpdateTitle(routing_id_, page_id_, shortened_title,
                                    title_direction));
 }
 
 void RenderViewImpl::UpdateEncoding(WebFrame* frame,
                                     const std::string& encoding_name) {
   // Only update main frame's encoding_name.
   if (webview()->mainFrame() == frame &&
@@ skipping 4403 matching lines @@
   for (size_t i = 0; i < icon_urls.size(); i++) {
     WebURL url = icon_urls[i].iconURL();
     if (!url.isEmpty())
       urls.push_back(FaviconURL(url,
                                 ToFaviconType(icon_urls[i].iconType())));
   }
   SendUpdateFaviconURL(urls);
 }
 
 }  // namespace content