Mojo-ify implementation of screen orientation locking/unlocking.

content/browser/screen_orientation/screen_orientation.h

+// Copyright 2016 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_H
+#define CONTENT_BROWSER_SCREEN_ORIENTATION_SCREEN_ORIENTATION_H
+
+#include "base/callback.h"
+#include "base/memory/weak_ptr.h"
+#include "content/common/screen_orientation_interface.mojom.h"
+#include "content/public/browser/web_contents_binding_set.h"
+#include "content/public/browser/web_contents_observer.h"
+
+namespace content {
+
+class ScreenOrientationProvider;
+class WebContents;
+
+class ScreenOrientation : public mojom::ScreenOrientation,
+                          public WebContentsObserver {
+ public:
+  ScreenOrientation(WebContents* web_contents);

[mlamouri (slow - plz ping), 2016/11/13 00:26:35]

explicit

[lunalu1, 2016/11/16 18:46:58]

Done.

+  ~ScreenOrientation() override;
+
+  ScreenOrientationProvider* GetScreenOrientationProvider();
+
+ private:
+  // ScreenOrientation:
+  void LockOrientation(::blink::WebScreenOrientationLockType orientation,

[mlamouri (slow - plz ping), 2016/11/13 00:26:35]

why :: in front of Blink?

[lunalu1, 2016/11/16 18:46:58]

Done.

+                       const LockOrientationCallback& callback) override;
+  void UnlockOrientation() override;
+
+  // WebContentsObserver:
+  void DidNavigateMainFrame(const LoadCommittedDetails& details,
+                            const FrameNavigateParams& params) override;
+
+  void NotifyLockResult(::blink::mojom::ScreenOrientationLockResult result);
+
+  std::unique_ptr<ScreenOrientationProvider> provider_;
+  LockOrientationCallback on_result_callback_;
+  WebContentsFrameBindingSet<mojom::ScreenOrientation> bindings_;
+  base::WeakPtrFactory<ScreenOrientation> weak_factory_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_SCREEN_ORIENTATION_SCREEN_ORIENTATION_H