Mojo-ify implementation of screen orientation locking/unlocking.

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 <memory>
 
+#include "base/callback.h"
 #include "base/macros.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "third_party/WebKit/public/platform/modules/screen_orientation/WebScreenOrientationLockType.h"
+#include "third_party/WebKit/public/platform/modules/screen_orientation/screen_orientation.mojom.h"
 
 namespace content {
 
 class ScreenOrientationDelegate;
-class ScreenOrientationDispatcherHost;
 class WebContents;
 
+using LockOrientationCallback =
+    base::Callback<void(::blink::mojom::ScreenOrientationLockResult)>;
+
 // Handles screen orientation lock/unlock. Platforms which wish to provide
 // custom implementations can provide a factory for ScreenOrientationDelegate.
 class CONTENT_EXPORT ScreenOrientationProvider : public WebContentsObserver {
  public:
-  ScreenOrientationProvider(ScreenOrientationDispatcherHost* dispatcher_host,
-                            WebContents* web_contents);
+  ScreenOrientationProvider(WebContents* web_contents);
+
   ~ScreenOrientationProvider() override;
 
-  // Lock the screen orientation to |orientations|.
-  void LockOrientation(int request_id,
-                       blink::WebScreenOrientationLockType lock_orientation);
+  // Lock the screen orientation to |orientation|, |callback| is the callback
+  // that should be invoked when this request receives a result.
+  void LockOrientation(blink::WebScreenOrientationLockType orientation,
+                       const LockOrientationCallback& callback);
 
   // Unlock the screen orientation.
   void UnlockOrientation();
 
   // Inform about a screen orientation update. It is called to let the provider
   // know if a lock has been resolved.
   void OnOrientationChange();
 
   // Provide a delegate which creates delegates for platform implementations.
   // The delegate is not owned by ScreenOrientationProvider.
   static void SetDelegate(ScreenOrientationDelegate* delegate_);
 
   // WebContentsObserver
   void DidToggleFullscreenModeForTab(bool entered_fullscreen,
                                      bool will_cause_resize) override;
 
  private:
-  struct LockInformation {
-    LockInformation(int request_id, blink::WebScreenOrientationLockType lock);
-    int request_id;
-    blink::WebScreenOrientationLockType lock;
-  };
+  // Calls on |on_result_callback_| with |result|, followed by resetting
+  // |on_result_callback_| and |pending_lock_orientation_|.
+  void NotifyLockResult(::blink::mojom::ScreenOrientationLockResult result);
 
   // Returns the lock type that should be associated with 'natural' lock.
   // Returns WebScreenOrientationLockDefault if the natural lock type can't be
   // found.
   blink::WebScreenOrientationLockType GetNaturalLockType() const;
 
   // Whether the passed |lock| matches the current orientation. In other words,
   // whether the orientation will need to change to match the |lock|.
   bool LockMatchesCurrentOrientation(blink::WebScreenOrientationLockType lock);
 
   // Not owned, responsible for platform implementations.
   static ScreenOrientationDelegate* delegate_;
 
-  // ScreenOrientationDispatcherHost owns ScreenOrientationProvider.
-  ScreenOrientationDispatcherHost* dispatcher_;
-
   // Whether the ScreenOrientationProvider currently has a lock applied.
   bool lock_applied_;
 
   // Locks that require orientation changes are not completed until
   // OnOrientationChange.
-  std::unique_ptr<LockInformation> pending_lock_;
+
+  blink::WebScreenOrientationLockType pending_lock_orientation_;
+
+  LockOrientationCallback on_result_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenOrientationProvider);
 };
 
 } // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_SCREEN_ORIENTATION_PROVIDER_H_