Centralize ScreenOrientationProvider logic, add platform delegates

content/public/browser/screen_orientation_delegate.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_DELEGATE_H_
+#define CONTENT_PUBLIC_BROWSER_SCREEN_ORIENTATION_DELEGATE_H_
+
+#include "base/macros.h"
+#include "content/common/content_export.h"
+#include "third_party/WebKit/public/platform/WebScreenOrientationLockType.h"
+
+namespace content {
+
+class WebContents;
+
+// Can be implemented to provide platform specific functionality for
+// ScreenOrientationProvider.
+class CONTENT_EXPORT ScreenOrientationDelegate {
+ public:
+  ScreenOrientationDelegate() {};
+  virtual ~ScreenOrientationDelegate() {}
+
+  // Returns true if the tab must be fullscreen in order for

[mlamouri (slow - plz ping), 2014/10/08 09:13:18]

nit: s/tab/|web_contents|/ ?

+  // ScreenOrientationProvider to respond to requests.
+  virtual bool FullScreenRequired(WebContents* web_contents) = 0;
+
+  // Lock display to the given orientation.
+  virtual void Lock(blink::WebScreenOrientationLockType lock_orientation) = 0;
+
+  // Are ScreenOrientationProvider requests currently supported by the platform.
+  virtual bool ScreenOrientationProviderSupported() = 0;
+
+  // Unlocks the display, allowing hardware rotation to resume.
+  virtual void Unlock() = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ScreenOrientationDelegate);
+};
+
+} // namespace content
+
+#endif // CONTENT_PUBLIC_BROWSER_SCREEN_ORIENTATION_DELEGATE_H_
+