Chromium plumbing for Screen Orientation API lock/unlock.

content/browser/screen_orientation/screen_orientation_dispatcher_host.h

Index: content/browser/screen_orientation/screen_orientation_dispatcher_host.h
diff --git a/content/browser/screen_orientation/screen_orientation_dispatcher_host.h b/content/browser/screen_orientation/screen_orientation_dispatcher_host.h
index 75620d9738d7db0959f6d2e47d2831960954fade..383a61b5b4c4156b1ff6ed93227b56c891a45b82 100644
--- a/content/browser/screen_orientation/screen_orientation_dispatcher_host.h
+++ b/content/browser/screen_orientation/screen_orientation_dispatcher_host.h
@@ -10,8 +10,13 @@
 
 namespace content {
 
-// ScreenOrientationDispatcherHost
-class ScreenOrientationDispatcherHost : public BrowserMessageFilter {
+class ScreenOrientationProvider;
+
+// ScreenOrientationDispatcherHost is a browser filter for Screen Orientation
+// messages and also helps dispatching messages about orientation changes to the
+// renderers.
+class CONTENT_EXPORT ScreenOrientationDispatcherHost
+    : public BrowserMessageFilter {
  public:
   ScreenOrientationDispatcherHost();
 
@@ -20,8 +25,17 @@ class ScreenOrientationDispatcherHost : public BrowserMessageFilter {
 
   void OnOrientationChange(blink::WebScreenOrientation orientation);
 
-private:
-  virtual ~ScreenOrientationDispatcherHost() {}
+  void SetProviderForTests(ScreenOrientationProvider* provider);
+
+ private:
+  virtual ~ScreenOrientationDispatcherHost();
+
+  void OnLockRequest(blink::WebScreenOrientations orientations);
+  void OnUnlockRequest();
+
+  static ScreenOrientationProvider* CreateProvider();
+
+  scoped_ptr<ScreenOrientationProvider> provider_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenOrientationDispatcherHost);
 };