mac: History swiping doesn't work right with iframes.

content/public/browser/render_widget_host_view_mac_delegate.h

Index: content/public/browser/render_widget_host_view_mac_delegate.h
diff --git a/content/public/browser/render_widget_host_view_mac_delegate.h b/content/public/browser/render_widget_host_view_mac_delegate.h
index 06af8254b4eba20625b1d5408297b30ece11acec..976940d2cc8ea16e12129a520b9b4fc1b24b2334 100644
--- a/content/public/browser/render_widget_host_view_mac_delegate.h
+++ b/content/public/browser/render_widget_host_view_mac_delegate.h
@@ -7,6 +7,10 @@
 
 #import <Cocoa/Cocoa.h>
 
+namespace blink {
+class WebMouseWheelEvent;
+}
+
 // This protocol is used as a delegate for the NSView class used in the
 // hierarchy. There are two ways to extend the view:
 // - Implement the methods listed in the protocol below.
@@ -27,9 +31,6 @@
 // normal processing should take place.
 - (BOOL)handleEvent:(NSEvent*)event;
 
-// Notification that a wheel event was unhandled.
-- (void)gotUnhandledWheelEvent;
-
 // Notification of scroll offset pinning.
 - (void)scrollOffsetPinnedToLeft:(BOOL)left toRight:(BOOL)right;
 
@@ -60,6 +61,11 @@
 // 2-finger history swipe in the given direction.
 - (BOOL)canRubberbandLeft:(NSView*)view;
 - (BOOL)canRubberbandRight:(NSView*)view;
+
+// The browser process received an ACK from the renderer after it processed
+// |event|.
+- (void)rendererHandledWheelEvent:(const blink::WebMouseWheelEvent&)event
+                         consumed:(BOOL)consumed;
 @end
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_VIEW_MAC_DELEGATE_H_