Mac: Make devtools window dockable.

chrome/browser/debugger/devtools_window.cc

 // Copyright (c) 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 "app/l10n_util.h"
 #include "base/command_line.h"
 #include "chrome/browser/browser.h"
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/browser_window.h"
@@ skipping 13 matching lines @@
 #include "chrome/common/url_constants.h"
 #include "grit/generated_resources.h"
 
 const std::wstring DevToolsWindow::kDevToolsApp = L"DevToolsApp";
 
 // static
 TabContents* DevToolsWindow::GetDevToolsContents(TabContents* inspected_tab) {
   if (!inspected_tab) {
     return NULL;
   }
+
+  if (!DevToolsManager::GetInstance())
+    return NULL;  // Happens only in tests.
+
   DevToolsClientHost* client_host = DevToolsManager::GetInstance()->
           GetDevToolsClientHostFor(inspected_tab->render_view_host());
   if (!client_host) {
     return NULL;
   }
 
   DevToolsWindow* window = client_host->AsDevToolsWindow();
   if (!window || !window->is_docked()) {
     return NULL;
   }
@@ skipping 192 matching lines @@
       NotifyCloseListener();
       delete this;
     }
   }
 }
 
 void DevToolsWindow::OpenConsole() {
   tab_contents_->render_view_host()->
       ExecuteJavascriptInWebFrame(L"", L"WebInspector.showConsole();");
 }