[Mac] Fix Toolbar glimpse during fullscreen transition

chrome/browser/ui/cocoa/presentation_mode_controller.mm

 // Copyright (c) 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/presentation_mode_controller.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #import "base/mac/mac_util.h"
@@ skipping 34 matching lines @@
   PresentationModeController* self =
       static_cast<PresentationModeController*>(context);
 
   // If Chrome has multiple fullscreen windows in their own space, the Handler
   // becomes flaky and might start receiving kMenuBarRevealEventKind events
   // from another space. Since the menubar in the another space is in either a
   // shown or hidden state, it will give us a reveal fraction of 0.0 or 1.0.
   // As such, we should ignore the kMenuBarRevealEventKind event if it gives
   // us a fraction of 0.0 or 1.0, and rely on kEventMenuBarShown and
   // kEventMenuBarHidden to set these values.
-  if ([self isMainWindow]) {
+  if ([self isMainWindow] && ![self isFullscreenTransitionInProgress]) {
     if (GetEventKind(event) == kMenuBarRevealEventKind) {
       CGFloat revealFraction = 0;
       GetEventParameter(event, FOUR_CHAR_CODE('rvlf'), typeCGFloat, NULL,
                         sizeof(CGFloat), NULL, &revealFraction);
       if (revealFraction > 0.0 && revealFraction < 1.0)
         [self setMenuBarRevealProgress:revealFraction];
     } else if (GetEventKind(event) == kEventMenuBarShown) {
       [self setMenuBarRevealProgress:1.0];
     } else {
       [self setMenuBarRevealProgress:0.0];
@@ skipping 353 matching lines @@
 // the logic is correct and not fragile.
 - (CGFloat)menubarOffset {
   if ([browserController_ isInAppKitFullscreen])
     return -std::floor(menubarFraction_ * [self floatingBarVerticalOffset]);
 
   return [self shouldShowMenubarInImmersiveFullscreen]
              ? -[self floatingBarVerticalOffset]
              : 0;
 }
 
+- (BOOL)isFullscreenTransitionInProgress {
+  return [browserController_ isFullscreenTransitionInProgress];
+}
+
 - (BOOL)isMainWindow {
   return [browserController_ window].isMainWindow;
 }
 
 // Used to activate the floating bar in presentation mode.
 - (void)mouseEntered:(NSEvent*)event {
   DCHECK(inPresentationMode_);
 
   // Having gotten a mouse entered, we no longer need to do exit checks.
   [self cancelMouseExitCheck];
@@ skipping 313 matching lines @@
   [self updateMenuBarAndDockVisibility];
 
   // TODO(rohitrao): Remove the Exit Fullscreen button.  http://crbug.com/35956
 }
 
 - (BOOL)shouldShowMenubarInImmersiveFullscreen {
   return [self doesScreenHaveMenuBar] && toolbarFraction_ > 0.99;
 }
 
 @end