override chrome:// URLs via extensions.

chrome/browser/extensions/extension_host.cc

 // Copyright (c) 2006-2009 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/extensions/extension_host.h"
 
 #include "app/resource_bundle.h"
 #include "base/string_util.h"
 #include "chrome/browser/browser.h"
 #include "chrome/browser/browser_list.h"
@@ skipping 156 matching lines @@
       view->SetDidInsertCSS(true);
     }
   }
 #elif defined(OS_LINUX)
   ExtensionViewGtk* view = view_.get();
   if (view && view->is_toolstrip()) {
     render_view_host->InsertCSSInWebFrame(L"", toolstrip_css.as_string());
   }
 #endif
 
-  did_stop_loading_ = true;
+  if (!did_stop_loading_) {
+    NotificationService::current()->Notify(
+        NotificationType::EXTENSION_HOST_DID_STOP_LOADING,
+        Source<Profile>(profile_),
+        Details<ExtensionHost>(this));
+    did_stop_loading_ = true;
+  }
 }
 
 void ExtensionHost::DocumentAvailableInMainFrame(RenderViewHost* rvh) {
   document_element_available_ = true;
   if (is_background_page())
     extension_->SetBackgroundPageReady();
 }
 
 void ExtensionHost::RunJavaScriptMessage(const std::wstring& message,
                                          const std::wstring& default_prompt,
@@ skipping 108 matching lines @@
   if (view_.get())
     view_->HandleMouseLeave();
 #endif
 }
 
 Browser* ExtensionHost::GetBrowser() {
 #if defined(OS_WIN) || defined(OS_LINUX)
   if (view_.get())
     return view_->browser();
 #endif
-  Browser* browser = BrowserList::GetLastActiveWithProfile(
-      render_view_host()->process()->profile());
+  Profile* profile = render_view_host()->process()->profile();
+  Browser* browser = BrowserList::GetLastActiveWithProfile(profile);
+
+  // It's possible for a browser to exist, but to have never been active.
+  // This can happen if you launch the browser on a machine without an active
+  // desktop (a headless buildbot) or if you quickly give another app focus
+  // at launch time.  This is easy to do with browser_tests.
+  if (!browser)
+    browser = BrowserList::FindBrowserWithProfile(profile);
+
+  // TODO(erikkay): can this still return NULL?  Is Rafael's comment still
+  // valid here?
   // NOTE(rafaelw): This can return NULL in some circumstances. In particular,
   // a toolstrip or background_page onload chrome.tabs api call can make it
   // into here before the browser is sufficiently initialized to return here.
   // A similar situation may arise during shutdown.
   // TODO(rafaelw): Delay creation of background_page until the browser
   // is available. http://code.google.com/p/chromium/issues/detail?id=13284
   return browser;
 }
 
 ViewType::Type ExtensionHost::GetRenderViewType() const {
@@ skipping 15 matching lines @@
     window_id = ExtensionTabUtil::GetWindowId(
         const_cast<ExtensionHost* >(this)->GetBrowser());
   } else if (extension_host_type_ == ViewType::EXTENSION_BACKGROUND_PAGE) {
     // Background page is not attached to any browser window, so pass -1.
     window_id = -1;
   } else {
     NOTREACHED();
   }
   return window_id;
 }