Mojo-ify implementation of screen orientation locking/unlocking.

content/browser/screen_orientation/screen_orientation_impl.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_IMPL_H
+#define CONTENT_BROWSER_SCREEN_ORIENTATION_SCREEN_ORIENTATION_IMPL_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

[blundell, 2016/10/25 16:09:26]

ah you already renamed the class, great! so it's just the filename.

[lunalu1, 2016/11/03 23:15:25]

Done.

+    : public mojom::ScreenOrientation,
+      public WebContentsObserver {
+ public:
+  ScreenOrientation(WebContents* web_contents);
+  ~ScreenOrientation() override;
+
+  ScreenOrientationProvider* GetScreenOrientationProvider();
+
+ private:
+  // ScreenOrientation:
+  void LockOrientation(::blink::WebScreenOrientationLockType orientation,
+                       const LockOrientationCallback& callback) override;
+  void UnlockOrientation() override;
+  // WebContentsObserver:

[blundell, 2016/10/25 16:09:26]

nit: blank line before

[lunalu1, 2016/11/03 23:15:25]

Done.

+  void DidNavigateMainFrame(const LoadCommittedDetails& details,
+                            const FrameNavigateParams& params) override;
+
+  void NotifyLockResult(::blink::mojom::ScreenOrientationLockResult result);
+
+  WebContents* web_contents_;

[blundell, 2016/10/25 16:09:26]

nit: if it's a WCO it can just use web_contents() instead.

[lunalu1, 2016/11/03 23:15:25]

Done.

+  std::unique_ptr<ScreenOrientationProvider> provider_;
+  LockOrientationCallback on_result_callback_;
+  WebContentsFrameBindingSet<mojom::ScreenOrientation> binding_;

[blundell, 2016/10/25 16:09:26]

is this called binding_ or bindings_ in other classes?

[Ken Rockot(use gerrit already), 2016/10/26 22:00:44]

bindings_ is probably a better name. There's a binding per RenderFrameHost.

[lunalu1, 2016/11/03 23:15:25]

Done.

+  base::WeakPtrFactory<ScreenOrientation> weak_factory_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_SCREEN_ORIENTATION_SCREEN_ORIENTATION_IMPL_H