Add unit tests for DevToolsManager

chrome/browser/debugger/devtools_window.h

 // 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.
 
 #ifndef CHROME_BROWSER_DEBUGGER_DEV_TOOLS_WINDOW_H_
 #define CHROME_BROWSER_DEBUGGER_DEV_TOOLS_WINDOW_H_
 
 #include "base/basictypes.h"
 
 class DevToolsInstanceDescriptor;
 
 class DevToolsWindow {
  public:
   static DevToolsWindow* Create(DevToolsInstanceDescriptor* descriptor);
   virtual ~DevToolsWindow() {}
 
   // Show developer tools window.
   virtual void Show() = 0;
   virtual void Close() = 0;
 
  protected:
   DevToolsWindow() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DevToolsWindow);
 };
 
+// Factory for creating DevToolsWindows.  Useful for unit tests.
+class DevToolsWindowFactory {
+ public:
+  virtual ~DevToolsWindowFactory() {}
+  virtual DevToolsWindow* CreateDevToolsWindow(
+      DevToolsInstanceDescriptor* descriptor) = 0;
+};
+
+
 #endif  // CHROME_BROWSER_DEBUGGER_DEV_TOOLS_WINDOW_H_