PoC: Using the toolkit-views fullscreen access bubble on Mac

chrome/browser/ui/cocoa/browser_window_controller_private.mm

Index: chrome/browser/ui/cocoa/browser_window_controller_private.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller_private.mm b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
index 5676d0a454d5cdb95a8035696a9394e431d2f2cf..31a7d4766b51171d340f3156da72faa1705177c6 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller_private.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
@@ -23,6 +23,7 @@
 #include "chrome/browser/ui/bookmarks/bookmark_tab_helper.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window_state.h"
+#import "chrome/browser/ui/cocoa/browser_window_cocoa.h"
 #import "chrome/browser/ui/cocoa/browser_window_fullscreen_transition.h"
 #import "chrome/browser/ui/cocoa/browser_window_layout.h"
 #import "chrome/browser/ui/cocoa/constrained_window/constrained_window_sheet_controller.h"
@@ -636,21 +637,13 @@ willPositionSheet:(NSWindow*)sheet
     // Show no exit instruction bubble on Mac when in Browser Fullscreen.
     [self destroyFullscreenExitBubbleIfNecessary];
   } else {
-    [exclusiveAccessBubbleWindowController_ closeImmediately];
-    exclusiveAccessBubbleWindowController_.reset(
-        [[ExclusiveAccessBubbleWindowController alloc]
-                       initWithOwner:self
-            exclusive_access_manager:browser_.get()->exclusive_access_manager()
-                             profile:browser_.get()->profile()
-                                 url:fullscreenUrl_
-                          bubbleType:exclusiveAccessBubbleType_]);
-    [exclusiveAccessBubbleWindowController_ showWindow];
+    exclusive_access_bubble_.reset(new ExclusiveAccessBubbleViews(
+        windowShim_.get(), fullscreenUrl_, exclusiveAccessBubbleType_));
   }
 }
 
 - (void)destroyFullscreenExitBubbleIfNecessary {
-  [exclusiveAccessBubbleWindowController_ closeImmediately];
-  exclusiveAccessBubbleWindowController_.reset();
+  exclusive_access_bubble_.reset();
 }
 
 - (void)contentViewDidResize:(NSNotification*)notification {
@@ -1051,9 +1044,8 @@ willPositionSheet:(NSWindow*)sheet
       positionFindBarViewAtMaxY:output.findBarMaxY
                        maxWidth:NSWidth(output.contentAreaFrame)];
 
-  [exclusiveAccessBubbleWindowController_
-      positionInWindowAtTop:output.fullscreenExitButtonMaxY
-                      width:NSWidth(output.contentAreaFrame)];
+  if (exclusive_access_bubble_)
+    exclusive_access_bubble_->RepositionIfVisible();
 }
 
 - (void)updateSubviewZOrder {