Make the RenderViewHostFactory a global. This prevents us from having to pass...

chrome/browser/renderer_host/render_view_host_factory.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_RENDERER_HOST_RENDER_VIEW_HOST_FACTORY_H_
+#define CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_FACTORY_H_
+
+#include "base/basictypes.h"
+
+class RenderViewHost;
+class RenderViewHostDelegate;
+class SiteInstance;
+
+namespace base {
+class WaitableEvent;
+}  // namespace base
+
+// A factory for creating RenderViewHosts. There is a global factory function
+// that can be installed for the purposes of testing to provide a specialized
+// RenderViewHost class.
+class RenderViewHostFactory {
+ public:
+  // Creates a RenderViewHost using the currently registered factory, or the
+  // default one if no factory is registered. Ownership of the returned
+  // pointer will be passed to the caller.
+  static RenderViewHost* Create(SiteInstance* instance,
+                                RenderViewHostDelegate* delegate,
+                                int routing_id,
+                                base::WaitableEvent* modal_dialog_event);
+
+  // Returns true if there is currently a globally-registered factory.
+  static bool has_factory() {
+    return !!factory_;
+  }
+
+ protected:
+  RenderViewHostFactory() {}
+  virtual ~RenderViewHostFactory() {}
+
+  // You can derive from this class and specify an implementation for this
+  // function to create a different kind of RenderViewHost for testing.
+  virtual RenderViewHost* CreateRenderViewHost(
+      SiteInstance* instance,
+      RenderViewHostDelegate* delegate,
+      int routing_id,
+      base::WaitableEvent* modal_dialog_event) = 0;
+
+  // Registers your factory to be called when new RenderViewHosts are created.
+  // We have only one global factory, so there must be no factory registered
+  // before the call. This class does NOT take ownership of the pointer.
+  static void RegisterFactory(RenderViewHostFactory* factory);
+
+  // Unregister the previously registered factory. With no factory registered,
+  // the default RenderViewHosts will be created.
+  static void UnregisterFactory();
+
+ private:
+  // The current globally registered factory. This is NULL when we should
+  // create the default RenderViewHosts.
+  static RenderViewHostFactory* factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(RenderViewHostFactory);
+};
+
+
+#endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_FACTORY_H_