Fix animations not starting on detached elements

Source/core/testing/Internals.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 454 matching lines @@
 {
     if (pauseTime < 0) {
         exceptionState.throwDOMException(InvalidAccessError, ExceptionMessages::indexExceedsMinimumBound("pauseTime", pauseTime, 0.0));
         return;
     }
 
     frame()->view()->updateLayoutAndStyleForPainting();
     frame()->document()->timeline().pauseAnimationsForTesting(pauseTime);
 }
 
+bool Internals::isCompositedAnimation(Animation* animation)
+{
+    return animation->hasActiveAnimationsOnCompositor();
+}
+
 void Internals::advanceTimeForImage(Element* image, double deltaTimeInSeconds, ExceptionState& exceptionState)
 {
     ASSERT(image);
     if (deltaTimeInSeconds < 0) {
         exceptionState.throwDOMException(InvalidAccessError, ExceptionMessages::indexExceedsMinimumBound("deltaTimeInSeconds", deltaTimeInSeconds, 0.0));
         return;
     }
 
     if (!isHTMLImageElement(*image)) {
         exceptionState.throwDOMException(InvalidAccessError, "The element provided is not a image element.");
@@ skipping 1953 matching lines @@
     return ClientRectList::create(rects);
 }
 
 void Internals::setCapsLockState(bool enabled)
 {
     PlatformKeyboardEvent::setCurrentCapsLockState(enabled ?
         PlatformKeyboardEvent::OverrideCapsLockState::On : PlatformKeyboardEvent::OverrideCapsLockState::Off);
 }
 
 } // namespace blink