Centralize ScreenOrientationProvider logic, add platform delegates

content/browser/screen_orientation/screen_orientation_provider_android.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_PROVIDER_ANDROID_H_
-#define CONTENT_BROWSER_SCREEN_ORIENTATION_SCREEN_ORIENTATION_PROVIDER_ANDROID_H_
-
-#include <jni.h>
-
-#include "base/compiler_specific.h"
-#include "content/public/browser/screen_orientation_provider.h"
-#include "content/public/browser/web_contents_observer.h"
-
-namespace content {
-
-class ScreenOrientationDispatcherHost;
-class WebContentsImpl;
-
-class ScreenOrientationProviderAndroid : public ScreenOrientationProvider,
-                                         public WebContentsObserver {
- public:
-  explicit ScreenOrientationProviderAndroid(
-      ScreenOrientationDispatcherHost* dispatcher,
-      WebContents* web_contents);
-
-  static bool Register(JNIEnv* env);
-
-  // ScreenOrientationProvider
-  virtual void LockOrientation(int request_id,
-                               blink::WebScreenOrientationLockType) OVERRIDE;
-  virtual void UnlockOrientation() OVERRIDE;
-  virtual void OnOrientationChange() OVERRIDE;
-
-  // WebContentsObserver
-  virtual void DidToggleFullscreenModeForTab(bool entered_fullscreen) OVERRIDE;
-
-  // Ask the ScreenOrientationListener (Java) to start accurately listening to
-  // the screen orientation. It keep track of the number of start request if it
-  // is already running an accurate listening.
-  static void StartAccurateListening();
-
-  // Ask the ScreenOrientationListener (Java) to stop accurately listening to
-  // the screen orientation. It will actually stop only if the number of stop
-  // requests matches the number of start requests.
-  static void StopAccurateListening();
-
- private:
-  WebContentsImpl* web_contents_impl();
-
-  // Whether the passed |lock| matches the current orientation. In other words,
-  // whether the orientation will need to change to match the |lock|.
-  bool LockMatchesCurrentOrientation(blink::WebScreenOrientationLockType lock);
-
-  // Returns the lock type that should be associated with 'natural' lock.
-  // Returns WebScreenOrientationLockDefault if the natural lock type can't be
-  // found.
-  blink::WebScreenOrientationLockType GetNaturalLockType() const;
-
-  virtual ~ScreenOrientationProviderAndroid();
-
-  // ScreenOrientationDispatcherHost owns ScreenOrientationProvider so
-  // dispatcher_ should not point to an invalid memory.
-  ScreenOrientationDispatcherHost* dispatcher_;
-
-  // Whether the ScreenOrientationProvider currently has a lock applied.
-  bool lock_applied_;
-
-  struct LockInformation {
-    LockInformation(int request_id, blink::WebScreenOrientationLockType lock);
-    int request_id;
-    blink::WebScreenOrientationLockType lock;
-  };
-  LockInformation* pending_lock_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScreenOrientationProviderAndroid);
-};
-
-} // namespace content
-
-#endif // CONTENT_BROWSER_SCREEN_ORIENTATION_SCREEN_ORIENTATION_PROVIDER_ANDROID_H_