Fix positioning of Mac permission prompts when fullscreen.

ui/base/test/scoped_fake_nswindow_fullscreen.mm

 // Copyright 2015 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/test/scoped_fake_nswindow_fullscreen.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/bind.h"
 #import "base/mac/foundation_util.h"
 #import "base/mac/mac_util.h"
 #import "base/mac/scoped_nsobject.h"
 #import "base/mac/scoped_objc_class_swizzler.h"
 #import "base/mac/sdk_forward_declarations.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 
 // This method exists on NSWindowDelegate on 10.7+.
 // To build on 10.6, we just need to declare it somewhere. We'll test
 // -[NSObject respondsToSelector] before calling it.
 #if !defined(MAC_OS_X_VERSION_10_7) || \
     MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_7
 @protocol NSWindowDelegateLion
 - (NSSize)window:(NSWindow*)window
     willUseFullScreenContentSize:(NSSize)proposedSize;
 @end
@@ skipping 141 matching lines @@
     if (no_frame_change_during_fullscreen)
       [window_ setFrame:frame_before_fullscreen_ display:YES animate:NO];
     [[NSNotificationCenter defaultCenter]
         postNotificationName:NSWindowDidExitFullScreenNotification
                       object:window_];
     window_ = nil;
     is_in_transition_ = false;
     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_;
   base::mac::ScopedObjCClassSwizzler set_style_mask_swizzler_;
 
   // The currently fullscreen window.
   NSWindow* window_ = nil;
   NSRect frame_before_fullscreen_;
   NSRect frame_during_fullscreen_;
   bool is_in_transition_ = false;
@@ skipping 10 matching lines @@
 ScopedFakeNSWindowFullscreen::ScopedFakeNSWindowFullscreen() {
   DCHECK(!g_fake_fullscreen_impl);
   impl_.reset(new Impl);
   g_fake_fullscreen_impl = impl_.get();
 }
 
 ScopedFakeNSWindowFullscreen::~ScopedFakeNSWindowFullscreen() {
   g_fake_fullscreen_impl = nullptr;
 }
 
+void ScopedFakeNSWindowFullscreen::FinishTransition() {
+  if (impl_->is_in_transition())
+    base::RunLoop().RunUntilIdle();
+
+  DCHECK(!impl_->is_in_transition());
+}
+
 }  // namespace test
 }  // namespace ui
 
 @implementation ToggleFullscreenDonorForWindow
 
 - (void)toggleFullScreen:(id)sender {
   NSWindow* window = base::mac::ObjCCastStrict<NSWindow>(self);
   g_fake_fullscreen_impl->ToggleFullscreenForWindow(window);
 }
 
 - (NSUInteger)styleMask {
   NSWindow* window = base::mac::ObjCCastStrict<NSWindow>(self);
   return g_fake_fullscreen_impl->StyleMaskForWindow(window);
 }
 
 - (void)setStyleMask:(NSUInteger)newMask {
   // Permit the non-fullscreen bits of the style mask to be changed while
   // currently fullscreen, but don't let AppKit see any fullscreen bits.
   NSUInteger currentMask = [self styleMask];
   if ((newMask ^ currentMask) & NSFullScreenWindowMask) {
     // Since 10.11, OSX triggers fullscreen transitions via setStyleMask, but
     // the faker doesn't attempt to fake them yet.
     NOTREACHED() << "Can't set NSFullScreenWindowMask while faking fullscreen.";
   }
   newMask &= ~NSFullScreenWindowMask;
   g_fake_fullscreen_impl->SetStyleMaskImplementation()(self, _cmd, newMask);
 }
 
 @end