Mac: Speculative fix for tracking area crashes

chrome/browser/ui/cocoa/browser_window_controller.mm

 // Copyright 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.
 
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 
 #include <cmath>
 #include <numeric>
 
 #include "base/command_line.h"
@@ skipping 377 matching lines @@
     // The fullscreen button's position may depend on the old avatar button's
     // width, but that does not require calling layoutSubviews first.
     NSUInteger collectionBehavior = [window collectionBehavior];
     collectionBehavior |=
        browser_->type() == Browser::TYPE_TABBED ||
            browser_->type() == Browser::TYPE_POPUP ?
                NSWindowCollectionBehaviorFullScreenPrimary :
                NSWindowCollectionBehaviorFullScreenAuxiliary;
     [window setCollectionBehavior:collectionBehavior];
 
+    // NSTrackingInVisibleRect doesn't work correctly with Lion's window
+    // resizing, http://crbug.com/176725 /
+    // http://openradar.appspot.com/radar?id=2773401 .
+    // Setting this property will send mouseMoved events to the window's first
+    // responder, so it will avoid the problem as long as the
+    // RenderWidgetHostViewCocoa is first responder.
+    // The bug will still be there if the omnibox has focus (Safari suffers
+    // from the same problem).
+    [window setAcceptsMouseMovedEvents:YES];
+
     [self layoutSubviews];
 
     // For a popup window, |desiredContentRect| contains the desired height of
     // the content, not of the whole window.  Now that all the views are laid
     // out, measure the current content area size and grow if needed.  The
     // window has not been placed onscreen yet, so this extra resize will not
     // cause visible jank.
     if (browser_->is_type_popup()) {
       CGFloat deltaH = desiredContentRect.height() -
                        NSHeight([[self tabContentArea] frame]);
@@ skipping 1827 matching lines @@
 
 - (BOOL)supportsBookmarkBar {
   return [self supportsWindowFeature:Browser::FEATURE_BOOKMARKBAR];
 }
 
 - (BOOL)isTabbedWindow {
   return browser_->is_type_tabbed();
 }
 
 @end  // @implementation BrowserWindowController(WindowType)