Reland ScreenOrientationDelegate on ChromeOS

ash/content/display/screen_orientation_delegate_chromeos.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 ASH_CONTENT_DISPLAY_SCREEN_ORIENTATION_DELEGATE_CHROMEOS_H_
+#define ASH_CONTENT_DISPLAY_SCREEN_ORIENTATION_DELEGATE_CHROMEOS_H_
+
+#include "base/macros.h"
+#include "content/public/browser/screen_orientation_delegate.h"
+#include "third_party/WebKit/public/platform/WebScreenOrientationLockType.h"
+
+namespace aura {
+class Window;
+}
+
+namespace content {
+class WebContents;
+}
+
+namespace ash {
+
+// Implements ChromeOS specific functionality for ScreenOrientationProvider.
+class ScreenOrientationDelegate : public content::ScreenOrientationDelegate {
+ public:
+  ScreenOrientationDelegate();
+  virtual ~ScreenOrientationDelegate();
+
+  // content::ScreenOrientationDelegate:
+  bool FullScreenRequired(content::WebContents* web_contents) override;
+  void Lock(content::WebContents* web_contents,
+            blink::WebScreenOrientationLockType lock_orientation) override;
+  bool ScreenOrientationProviderSupported() override;
+  void Unlock(content::WebContents* web_contents) override;
+
+ private:
+  // Locks rotation to the angle matching the primary orientation for
+  // |lock_orientation|.
+  void LockRotationToPrimaryOrientation(
+      blink::WebScreenOrientationLockType lock_orientation);
+
+  // Locks rotation to the angle matching the secondary orientation for
+  // |lock_orientation|.
+  void LockRotationToSecondaryOrientation(
+      blink::WebScreenOrientationLockType lock_orientation);
+
+  // For orientations that do not specify primary or secondary, locks to the
+  // current rotation if it matches |lock_orientation|. Otherwise locks to a
+  // matching rotation.
+  void LockToRotationMatchingOrientation(
+      blink::WebScreenOrientationLockType lock_orientation);
+
+  // The window that has applied the current lock. No other window can apply a
+  // lock until the current window unlocks rotation.
+  aura::Window* locking_window_;
+
+  // The orientation of the display when at a rotation of 0.
+  blink::WebScreenOrientationLockType natural_orientation_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScreenOrientationDelegate);
+};
+
+}  // namespace ash
+
+#endif  // ASH_CONTENT_DISPLAY_SCREEN_ORIENTATION_DELEGATE_CHROMEOS_H_