Exposes OrientationChangeEvent.

content/browser/renderer_host/render_view_host_impl.h

 // Copyright (c) 2012 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_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 365 matching lines @@
 
   // Creates a full screen RenderWidget.
   void CreateNewFullscreenWidget(int route_id);
 
 #if defined(OS_MACOSX)
   // Select popup menu related methods (for external popup menus).
   void DidSelectPopupMenuItem(int selected_index);
   void DidCancelPopupMenu();
 #endif
 
+  // User rotated the screen. Calls the "onorientationchange" Javascript hook.
+  void SendOrientationChangeEvent(int orientation);
+
   void set_save_accessibility_tree_for_testing(bool save) {
     save_accessibility_tree_for_testing_ = save;
   }
 
   void set_send_accessibility_updated_notifications(bool send) {
     send_accessibility_updated_notifications_ = send;
   }
 
   const webkit_glue::WebAccessibility& accessibility_tree_for_testing() {
     return accessibility_tree_;
   }
 
   bool is_waiting_for_unload_ack_for_testing() {
     return is_waiting_for_unload_ack_;
   }
 
   // Checks that the given renderer can request |url|, if not it sets it to
   // about:blank.
   // empty_allowed must be set to false for navigations for security reasons.
   static void FilterURL(ChildProcessSecurityPolicyImpl* policy,
                         int renderer_id,
                         bool empty_allowed,
                         GURL* url);
 
   // NOTE: Do not add functions that just send an IPC message that are called in
-  // one or two places.  Have the caller send the IPC message directly.
+  // one or two places. Have the caller send the IPC message directly (unless
+  // the caller places are in different platforms, in which case it's better
+  // to keep them consistent).

[bulach, 2012/05/14 17:10:49]

I tried to clarify this a bit, let me know if this works for you..

 
  protected:
   friend class RenderViewHostObserver;
 
   // Add and remove observers for filtering IPC messages.  Clients must be sure
   // to remove the observer before they go away.
   void AddObserver(RenderViewHostObserver* observer);
   void RemoveObserver(RenderViewHostObserver* observer);
 
   // RenderWidgetHost protected overrides.
@@ skipping 222 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_