Track where WebContents are created in order to better understand issue.

chrome/browser/ui/cocoa/profiles/user_manager_mac.mm

 // 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 "chrome/browser/ui/cocoa/profiles/user_manager_mac.h"
 
 #include "base/mac/foundation_util.h"
 #include "chrome/app/chrome_command_ids.h"
 #import "chrome/browser/app_controller_mac.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 10 matching lines @@
 #include "chrome/browser/ui/cocoa/constrained_window/constrained_window_mac.h"
 #include "chrome/browser/ui/user_manager.h"
 #include "chrome/grit/chromium_strings.h"
 #include "components/web_modal/web_contents_modal_dialog_host.h"
 #include "components/web_modal/web_contents_modal_dialog_manager.h"
 #include "components/web_modal/web_contents_modal_dialog_manager_delegate.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_delegate.h"
+#include "content/public/browser/web_contents_source.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 #include "ui/events/keycodes/keyboard_codes.h"
 
 namespace {
 
 // Update the App Controller with a new Profile. Used when a Profile is locked
 // to set the Controller to the Guest profile so the old Profile's bookmarks,
 // etc... cannot be accessed.
 void ChangeAppControllerForProfile(Profile* profile,
                                    Profile::CreateStatus status) {
@@ skipping 146 matching lines @@
       0, 0, UserManager::kReauthDialogWidth, UserManager::kReauthDialogHeight);
   base::scoped_nsobject<ConstrainedWindowCustomWindow> window(
       [[ConstrainedWindowCustomWindow alloc]
           initWithContentRect:frame
                     styleMask:NSTitledWindowMask | NSClosableWindowMask]);
   if ((self = [super initWithWindow:window])) {
     webContents_ = webContents;
 
     reauthWebContents_.reset(content::WebContents::Create(
         content::WebContents::CreateParams(profile)));
+    WebContentsSource::CreateForWebContentsAndLocation(reauthWebContents_.get(),
+                                                       FROM_HERE);
     window.get().contentView = reauthWebContents_->GetNativeView();
     webContentsDelegate_.reset(
        new ReauthDialogDelegate(reauthWebContents_.get(), emailAddress_));
     reauthWebContents_->SetDelegate(webContentsDelegate_.get());
 
     base::scoped_nsobject<CustomConstrainedWindowSheet> sheet(
        [[CustomConstrainedWindowSheet alloc]
            initWithCustomWindow:[self window]]);
     constrained_window_.reset(
        new ConstrainedWindowMac(
@@ skipping 79 matching lines @@
   [window setTitle:l10n_util::GetNSString(IDS_PRODUCT_NAME)];
   [window setMinSize:NSMakeSize(UserManager::kWindowWidth,
                                 UserManager::kWindowHeight)];
 
   if ((self = [super initWithWindow:window])) {
     userManagerObserver_ = userManagerObserver;
 
     // Initialize the web view.
     webContents_.reset(content::WebContents::Create(
         content::WebContents::CreateParams(profile)));
+    WebContentsSource::CreateForWebContentsAndLocation(webContents_.get(),
+                                                       FROM_HERE);
     window.contentView = webContents_->GetNativeView();
     webContentsDelegate_.reset(new UserManagerWebContentsDelegate());
     webContents_->SetDelegate(webContentsDelegate_.get());
 
     web_modal::WebContentsModalDialogManager::CreateForWebContents(
         webContents_.get());
     modal_manager_delegate_.reset(
         new UserManagerModalManagerDelegate([[self window] contentView]));
     web_modal::WebContentsModalDialogManager::FromWebContents(
         webContents_.get())->SetDelegate(modal_manager_delegate_.get());
@@ skipping 166 matching lines @@
   ProfileMetrics::LogTimeToOpenUserManager(
       base::Time::Now() - user_manager_started_showing_);
   user_manager_started_showing_ = base::Time();
 }
 
 void UserManagerMac::WindowWasClosed() {
   CloseReauthDialog();
   instance_ = NULL;
   delete this;
 }