Fix positioning of Mac permission prompts when fullscreen.

ui/base/test/scoped_fake_nswindow_fullscreen.mm

Index: ui/base/test/scoped_fake_nswindow_fullscreen.mm
diff --git a/ui/base/test/scoped_fake_nswindow_fullscreen.mm b/ui/base/test/scoped_fake_nswindow_fullscreen.mm
index 1fcd8949b61477e13f8684b6b1548902532d31d2..ce601c1ea65d1d9cf0907238be7f5c1c21f4236f 100644
--- a/ui/base/test/scoped_fake_nswindow_fullscreen.mm
+++ b/ui/base/test/scoped_fake_nswindow_fullscreen.mm
@@ -175,6 +175,8 @@ class ScopedFakeNSWindowFullscreen::Impl {
     style_as_fullscreen_ = false;
   }
 
+  bool is_in_transition() { return is_in_transition_; }
+
  private:
   base::mac::ScopedObjCClassSwizzler toggle_fullscreen_swizzler_;
   base::mac::ScopedObjCClassSwizzler style_mask_swizzler_;
@@ -205,6 +207,10 @@ ScopedFakeNSWindowFullscreen::~ScopedFakeNSWindowFullscreen() {
   g_fake_fullscreen_impl = nullptr;
 }
 
+bool ScopedFakeNSWindowFullscreen::IsInTransition() {
+  return impl_->is_in_transition();
+}
+
 }  // namespace test
 }  // namespace ui