Mac: Speculative fix for tracking area crashes

ui/base/cocoa/base_view.h

Index: ui/base/cocoa/base_view.h
diff --git a/ui/base/cocoa/base_view.h b/ui/base/cocoa/base_view.h
index 642ada2011d0812a58ed8c8ace2895b803b850cf..65e889ae7724aa25b87be67d6641077129498192 100644
--- a/ui/base/cocoa/base_view.h
+++ b/ui/base/cocoa/base_view.h
@@ -28,8 +28,17 @@ UI_BASE_EXPORT
   ui::ScopedCrTrackingArea trackingArea_;
   BOOL dragging_;
   base::scoped_nsobject<NSEvent> pendingExitEvent_;
+  id eventTap_;
 }
 
+// NSTrackingInVisibleRect doesn't work correctly with Lion's window resizing,
+// http://crbug.com/176725 / http://openradar.appspot.com/radar?id=2773401 .
+// Setting |wantsReliableMouseEvents| to YES will avoid using the tracking area
+// for mouse moved handling, and will instead tap it from the application's
+// event stream.
+- (instancetype)initWithFrame:(NSRect)frame
+     wantsReliableMouseEvents:(BOOL)wantsReliableMouseEvents;
+
 // Override these methods (mouseEvent, keyEvent) in a subclass.
 - (void)mouseEvent:(NSEvent *)theEvent;