Pipe "is pinned to left/right", "has horizontal/vertical scrollbar",

content/renderer/render_view.h

 // Copyright (c) 2011 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_RENDERER_RENDER_VIEW_H_
 #define CONTENT_RENDERER_RENDER_VIEW_H_
 #pragma once
 
 #include <deque>
 #include <map>
@@ skipping 541 matching lines @@
   virtual void didDestroyScriptContext(WebKit::WebFrame* frame);
   virtual void didCreateIsolatedScriptContext(WebKit::WebFrame* frame);
   virtual void logCrossFramePropertyAccess(
       WebKit::WebFrame* frame,
       WebKit::WebFrame* target,
       bool cross_origin,
       const WebKit::WebString& property_name,
       unsigned long long event_id);
   virtual void didUpdateLayout(WebKit::WebFrame* frame);
   virtual void didChangeScrollOffset(WebKit::WebFrame* frame);
+  virtual void numberOfWheelEventHandlersChanged(unsigned num_handlers);
+  virtual void didChangeContentsSize(WebKit::WebFrame* frame,
+                                     const WebKit::WebSize& size);
   virtual void reportFindInPageMatchCount(int request_id,
                                           int count,
                                           bool final_update);
   virtual void reportFindInPageSelection(int request_id,
                                          int active_match_ordinal,
                                          const WebKit::WebRect& sel);
 
   virtual void openFileSystem(WebKit::WebFrame* frame,
                               WebKit::WebFileSystem::Type type,
                               long long size,
@@ skipping 153 matching lines @@
                             const string16& default_value,
                             const GURL& frame_url,
                             string16* result);
 
   // Sends a message and runs a nested message loop.
   bool SendAndRunNestedMessageLoop(IPC::SyncMessage* message);
 
   // Send queued accessibility notifications from the renderer to the browser.
   void SendPendingAccessibilityNotifications();
 
+  // Called when the "pinned to left/right edge" state needs to be updated.
+  void UpdateScrollState(WebKit::WebFrame* frame);
+
   // IPC message handlers ------------------------------------------------------
   //
   // The documentation for these functions should be in
   // render_messages_internal.h for the message that the function is handling.
 
   void OnAccessibilityDoDefaultAction(int acc_obj_id);
   void OnAccessibilityNotificationsAck();
   void OnAllowBindings(int enabled_bindings_flags);
   void OnAllowScriptToClose(bool script_can_close);
   void OnAsyncFileOpened(base::PlatformFileError error_code,
@@ skipping 332 matching lines @@
   // View ----------------------------------------------------------------------
 
   // Cache the preferred size of the page in order to prevent sending the IPC
   // when layout() recomputes but doesn't actually change sizes.
   gfx::Size preferred_size_;
 
   // Used to delay determining the preferred size (to avoid intermediate
   // states for the sizes).
   base::OneShotTimer<RenderView> check_preferred_size_timer_;
 
+  // These store the "is main frame is scrolled all the way to the left
+  // or right" state that was last sent to the browser.
+  bool cached_is_main_frame_pinned_to_left_;
+  bool cached_is_main_frame_pinned_to_right_;
+
+  // These store the "has scrollbars" state last sent to the browser.
+  bool cached_has_main_frame_horizontal_scrollbar_;
+  bool cached_has_main_frame_vertical_scrollbar_;
+
 #if defined(OS_MACOSX)
   // Track the fake plugin window handles allocated on the browser side for
   // the accelerated compositor and (currently) accelerated plugins so that
   // we can discard them when the view goes away.
   std::set<gfx::PluginWindowHandle> fake_plugin_window_handles_;
 #endif
 
   // Plugins -------------------------------------------------------------------
 
   // Remember the first uninstalled plugin, so that we can ask the plugin
@@ skipping 113 matching lines @@
   // bunch of stuff, you should probably create a helper class and put your
   // data and methods on that to avoid bloating RenderView more.  You can use
   // the Observer interface to filter IPC messages and receive frame change
   // notifications.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderView);
 };
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_H_