Mojo-ify implementation of screen orientation locking/unlocking.

content/browser/screen_orientation/screen_orientation_dispatcher_host_impl.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_SCREEN_ORIENTATION_DISPATCHER_HOST_IMPL_H_
-#define CONTENT_BROWSER_SCREEN_ORIENTATION_SCREEN_ORIENTATION_DISPATCHER_HOST_IMPL_H_
-
-#include "base/macros.h"
-#include "content/public/browser/screen_orientation_dispatcher_host.h"
-#include "content/public/browser/web_contents_observer.h"
-#include "third_party/WebKit/public/platform/modules/screen_orientation/WebLockOrientationError.h"
-#include "third_party/WebKit/public/platform/modules/screen_orientation/WebScreenOrientationLockType.h"
-
-namespace content {
-
-class RenderFrameHost;
-class ScreenOrientationProvider;
-class WebContents;
-
-// ScreenOrientationDispatcherHost receives lock and unlock requests from the
-// RenderFrames and dispatch them to the ScreenOrientationProvider. It also
-// make sure that the right RenderFrame get replied for each lock request.
-class CONTENT_EXPORT ScreenOrientationDispatcherHostImpl
-    : public ScreenOrientationDispatcherHost,
-      public WebContentsObserver {
- public:
-  explicit ScreenOrientationDispatcherHostImpl(WebContents* web_contents);
-  ~ScreenOrientationDispatcherHostImpl() override;
-
-  // ScreenOrientationDispatcherHost:
-  void NotifyLockSuccess(int request_id) override;
-  void NotifyLockError(int request_id,
-                       blink::WebLockOrientationError error) override;
-  void OnOrientationChange() override;
-
-  // WebContentsObserver:
-  bool OnMessageReceived(const IPC::Message&,
-                         RenderFrameHost* render_frame_host) override;
-  void DidNavigateMainFrame(const LoadCommittedDetails& details,
-                            const FrameNavigateParams& params) override;
-
- private:
-  void OnLockRequest(RenderFrameHost* render_frame_host,
-                     blink::WebScreenOrientationLockType orientation,
-                     int request_id);
-  void OnUnlockRequest(RenderFrameHost* render_frame_host);
-
-  // Returns a RenderFrameHost if the request_id is still valid and the
-  // associated RenderFrameHost still exists. Returns NULL otherwise.
-  RenderFrameHost* GetRenderFrameHostForRequestID(int request_id);
-
-  void ResetCurrentLock();
-  void NotifyLockError(int request_id,
-                       RenderFrameHost* render_frame_host,
-                       blink::WebLockOrientationError error);
-
-  std::unique_ptr<ScreenOrientationProvider> provider_;
-
-  struct LockInformation {
-    LockInformation(int request_id, int process_id, int routing_id);
-    int request_id;
-    int process_id;
-    int routing_id;
-  };
-  // current_lock_ will be NULL if there are no current lock.
-  LockInformation* current_lock_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScreenOrientationDispatcherHostImpl);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_SCREEN_ORIENTATION_SCREEN_ORIENTATION_DISPATCHER_HOST_IMPL_H_