Chromium plumbing for Screen Orientation API lock/unlock.

content/browser/screen_orientation/screen_orientation_dispatcher_host.h

 // 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.
 
 #ifndef CONTENT_BROWSER_SCREEN_ORIENTATION_DISPATCHER_HOST_H_
 #define CONTENT_BROWSER_SCREEN_ORIENTATION_DISPATCHER_HOST_H_
 
 #include "content/public/browser/browser_message_filter.h"
 #include "third_party/WebKit/public/platform/WebScreenOrientation.h"
 
 namespace content {
 
-// ScreenOrientationDispatcherHost
-class ScreenOrientationDispatcherHost : public BrowserMessageFilter {
+class ScreenOrientationProvider;
+
+// ScreenOrientationDispatcherHost is a browser filter for Screen Orientation
+// messages and also helps dispatching messages about orientation changes to the
+// renderers.
+class CONTENT_EXPORT ScreenOrientationDispatcherHost
+    : public BrowserMessageFilter {
  public:
   ScreenOrientationDispatcherHost();
 
   // BrowserMessageFilter
   virtual bool OnMessageReceived(const IPC::Message&, bool*) OVERRIDE;
 
   void OnOrientationChange(blink::WebScreenOrientation orientation);
 
-private:
-  virtual ~ScreenOrientationDispatcherHost() {}
+  void SetProviderForTests(ScreenOrientationProvider* provider);
+
+ private:
+  virtual ~ScreenOrientationDispatcherHost();
+
+  void OnLockRequest(blink::WebScreenOrientations orientations);
+  void OnUnlockRequest();
+
+  static ScreenOrientationProvider* CreateProvider();
+
+  scoped_ptr<ScreenOrientationProvider> provider_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenOrientationDispatcherHost);
 };
 
 }  // namespace content
 
 #endif // CONTENT_BROWSER_SCREEN_ORIENTATION_DISPATCHER_HOST_H_