[Mac] Refactor Immersive Fullscreen Logic

ui/base/cocoa/tracking_area.mm

 // 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.
 
 #import "ui/base/cocoa/tracking_area.h"
 
 #include "base/logging.h"
 
 // NSTrackingArea does not retain its |owner| so CrTrackingArea wraps the real
 // owner in this proxy, which can stop forwarding messages to the owner when
@@ skipping 83 matching lines @@
 
 - (void)clearOwnerWhenWindowWillClose:(NSWindow*)window {
   DCHECK(window);
   NSNotificationCenter* center = [NSNotificationCenter defaultCenter];
   [center addObserver:self
              selector:@selector(windowWillClose:)
                  name:NSWindowWillCloseNotification
                object:window];
 }
 
+- (BOOL)mouseInsideTrackingAreaForView:(NSView*)view {
+  DCHECK(view);
+  NSPoint mouseLoc = [[view window] mouseLocationOutsideOfEventStream];
+  NSPoint mousePos = [view convertPoint:mouseLoc fromView:nil];
+  return NSMouseInRect(mousePos, [self rect], [view isFlipped]);
+}
+
 - (void)windowWillClose:(NSNotification*)notif {
   [self clearOwner];
 }
 
 @end
 
 // Scoper //////////////////////////////////////////////////////////////////////
 
 namespace ui {
 
 ScopedCrTrackingArea::ScopedCrTrackingArea(CrTrackingArea* tracking_area)
     : tracking_area_(tracking_area) {
 }
 
 ScopedCrTrackingArea::~ScopedCrTrackingArea() {
   [tracking_area_ clearOwner];
 }
 
 void ScopedCrTrackingArea::reset(CrTrackingArea* tracking_area) {
   tracking_area_.reset(tracking_area);
 }
 
 CrTrackingArea* ScopedCrTrackingArea::get() const {
   return tracking_area_.get();
 }
 
 }  // namespace ui