Create Mojo service for locking/unlocking screen orientation.

content/public/browser/screen_orientation_provider.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_PUBLIC_BROWSER_SCREEN_ORIENTATION_PROVIDER_H_
 #define CONTENT_PUBLIC_BROWSER_SCREEN_ORIENTATION_PROVIDER_H_
 
+#include "base/callback.h"
 #include "base/macros.h"
 #include "content/common/content_export.h"
-#include "third_party/WebKit/public/platform/WebScreenOrientationLockType.h"
+#include "content/public/common/screen_orientation.mojom.h"
 
 namespace content {
 
-class ScreenOrientationDispatcherHost;
 class WebContents;
+class WebContentsImpl;
+
+typedef base::Callback<void(ScreenOrientationLockResult)>
+    ScreenOrientationLockCallback;
 
 // Interface that needs to be implemented by any backend that wants to handle
 // screen orientation lock/unlock.
 class CONTENT_EXPORT ScreenOrientationProvider {
  public:
-  // Lock the screen orientation to |orientations|.
+  // Lock the screen orientation to |lock_type|.  |callback| is the callback
+  // that should be invoked when this request receives a result.
   virtual void LockOrientation(
-      int request_id,
-      blink::WebScreenOrientationLockType orientations) = 0;
+      ScreenOrientationLockType lock_type,
+      const ScreenOrientationLockCallback& callback) = 0;
 
   // Unlock the screen orientation.
   virtual void UnlockOrientation() = 0;
 
   // Inform about a screen orientation update. It is called to let the provider
   // know if a lock has been resolved.
   virtual void OnOrientationChange() = 0;
 
   virtual ~ScreenOrientationProvider() {}
 
  protected:
-  friend class ScreenOrientationDispatcherHostImpl;
+  friend class WebContentsImpl;
 
   static ScreenOrientationProvider* Create(
-      ScreenOrientationDispatcherHost* dispatcher_host,
       WebContents* web_contents);
-
   ScreenOrientationProvider() {}
 
   DISALLOW_COPY_AND_ASSIGN(ScreenOrientationProvider);
 };
 
 #if !defined(OS_ANDROID)
 // static
 ScreenOrientationProvider* ScreenOrientationProvider::Create(
-    ScreenOrientationDispatcherHost* dispatcher_host,
     WebContents* web_contents) {
   return NULL;
 }
-#endif // !defined(OS_ANDROID)
+#endif  // !defined(OS_ANDROID)
 
 } // namespace content
 
 #endif // CONTENT_PUBLIC_BROWSER_SCREEN_ORIENTATION_PROVIDER_H_