[DO NOT COMMIT] Remove chrome::NOTIFICATION_RETARGETING

content/test/web_contents_observer_sanity_checker.cc

 // Copyright 2014 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/test/web_contents_observer_sanity_checker.h"
 
+#include "base/debug/stack_trace.h"
 #include "base/strings/stringprintf.h"
 #include "build/build_config.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/common/frame_messages.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/site_instance.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "net/base/net_errors.h"
 
 namespace content {
 
 namespace {
 
 const char kWebContentsObserverSanityCheckerKey[] =
     "WebContentsObserverSanityChecker";
 
+// Set this variable to true to collect stack traces on observer method calls
+// so duplicate ones can be easily debugged.
+static bool g_collect_stack_traces = true;
+
 GlobalRoutingID GetRoutingPair(RenderFrameHost* host) {
   if (!host)
     return GlobalRoutingID(0, 0);
   return GlobalRoutingID(host->GetProcess()->GetID(), host->GetRoutingID());
 }
 
 }  // namespace
 
 // static
 void WebContentsObserverSanityChecker::Enable(WebContents* web_contents) {
@@ skipping 239 matching lines @@
 }
 
 void WebContentsObserverSanityChecker::DidOpenRequestedURL(
     WebContents* new_contents,
     RenderFrameHost* source_render_frame_host,
     const GURL& url,
     const Referrer& referrer,
     WindowOpenDisposition disposition,
     ui::PageTransition transition) {
   AssertRenderFrameExists(source_render_frame_host);
+
+  std::string trace;
+  if (g_collect_stack_traces) {
+    base::debug::StackTrace stack_trace;
+    trace = stack_trace.ToString();
+  }
+
+  bool did_not_exist = created_web_contents_.insert(std::make_pair(new_contents, trace)).second;
+  CHECK(did_not_exist) << "A WebContents was created for the same address as previously "
+                          "created one. The original one was allocated by:\n" << trace;
 }
 
 void WebContentsObserverSanityChecker::MediaStartedPlaying(
     const MediaPlayerId& id) {
   CHECK(!web_contents_destroyed_);
   CHECK(std::find(active_media_players_.begin(), active_media_players_.end(),
                   id) == active_media_players_.end());
   active_media_players_.push_back(id);
 }
 
@@ skipping 110 matching lines @@
       if (live_routes_.count(entry.first))
         return true;
       if (current_hosts_.count(entry.first))
         return true;
     }
   }
   return false;
 }
 
 }  // namespace content