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

content/renderer/render_view.h

Index: content/renderer/render_view.h
diff --git a/content/renderer/render_view.h b/content/renderer/render_view.h
index b34322c0c68432d6a3025b2dfbdb49cf4d4e3267..f0835284e395ff44355838b3898516f5be3cb345 100644
--- a/content/renderer/render_view.h
+++ b/content/renderer/render_view.h
@@ -559,6 +559,8 @@ class RenderView : public RenderWidget,
       unsigned long long event_id);
   virtual void didUpdateLayout(WebKit::WebFrame* frame);
   virtual void didChangeScrollOffset(WebKit::WebFrame* frame);
+  virtual void numberOfWheelEventHandlersChanged(unsigned numHandlers);

[jam, 2011/08/12 17:32:26]

nit: num_handlers

[Nico, 2011/08/12 17:37:50]

Done.

+  virtual void didChangeContentsSize(WebKit::WebFrame*, const WebKit::WebSize&);

[jam, 2011/08/12 17:32:26]

chrome style is to always name the parameters in the headers

[Nico, 2011/08/12 17:37:50]

Done.

   virtual void reportFindInPageMatchCount(int request_id,
                                           int count,
                                           bool final_update);
@@ -732,6 +734,9 @@ class RenderView : public RenderWidget,
   // 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);

[jam, 2011/08/12 17:32:26]

chrome style is UpdateScrollState

[Nico, 2011/08/12 17:37:50]

Done.

+
   // IPC message handlers ------------------------------------------------------
   //
   // The documentation for these functions should be in
@@ -1084,6 +1089,15 @@ class RenderView : public RenderWidget,
   // 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