[SPv2] Decomposite otherwise-compositable animations that paint nothing.

third_party/WebKit/Source/core/svg/graphics/SVGImage.cpp

 /*
  * Copyright (C) 2006 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. 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 567 matching lines @@
   FrameView* frameView = toLocalFrame(m_page->mainFrame())->view();
   frameView->updateAllLifecyclePhasesExceptPaint();
 
   // For SPv2 we run updateAnimations after the paint phase, but per above
   // comment we don't want to run lifecycle through to paint for SVG images.
   // Since we know SVG images never have composited animations we can update
   // animations directly without worrying about including
   // PaintArtifactCompositor analysis of whether animations should be
   // composited.
   if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
+    Optional<CompositorElementIdSet> compositedElementIds;
     DocumentAnimations::updateAnimations(frameView->layoutView()->document(),
-                                         DocumentLifecycle::LayoutClean);
+                                         DocumentLifecycle::LayoutClean,
+                                         compositedElementIds);
   }
 }
 
 void SVGImage::advanceAnimationForTesting() {
   if (SVGSVGElement* rootElement = svgRootElement(m_page.get())) {
     rootElement->timeContainer()->advanceFrameForTesting();
 
     // The following triggers animation updates which can issue a new draw
     // but will not permanently change the animation timeline.
     // TODO(pdr): Actually advance the document timeline so CSS animations
@@ skipping 104 matching lines @@
   }
 
   return m_page ? SizeAvailable : SizeUnavailable;
 }
 
 String SVGImage::filenameExtension() const {
   return "svg";
 }
 
 }  // namespace blink