Disentangle blend mode from updateDescendantDependentFlags

Source/core/rendering/compositing/RenderLayerCompositor.cpp

 /*
  * Copyright (C) 2009, 2010 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 266 matching lines @@
     if (!isLocalRoot)
         return;
 
     m_rootContentLayer->removeAllChildren();
     m_overflowControlsHostLayer->addChild(videoLayer);
     if (GraphicsLayer* backgroundLayer = fixedRootBackgroundLayer())
         backgroundLayer->removeFromParent();
     m_inOverlayFullscreenVideo = true;
 }
 
+void RenderLayerCompositor::updateWithoutAcceleratedCompositing(CompositingUpdateType updateType)
+{
+    ASSERT(!hasAcceleratedCompositing());
+
+    if (updateType >= CompositingUpdateAfterCompositingInputChange)
+        CompositingInputsUpdater(rootRenderLayer()).update();
+
+#if ENABLE(ASSERT)
+    CompositingInputsUpdater::assertNeedsCompositingInputsUpdateBitsCleared(rootRenderLayer());
+#endif
+}
+
 void RenderLayerCompositor::updateIfNeeded()
 {
     CompositingUpdateType updateType = m_pendingUpdateType;
     m_pendingUpdateType = CompositingUpdateNone;
 
-    if (!hasAcceleratedCompositing() || updateType == CompositingUpdateNone)
+    if (!hasAcceleratedCompositing()) {
+        updateWithoutAcceleratedCompositing(updateType);
+        return;
+    }
+
+    if (updateType == CompositingUpdateNone)
         return;
 
     RenderLayer* updateRoot = rootRenderLayer();
 
     Vector<RenderLayer*> layersNeedingRepaint;
 
     if (updateType >= CompositingUpdateAfterCompositingInputChange) {
         CompositingInputsUpdater(updateRoot).update();
 
 #if ENABLE(ASSERT)
@@ skipping 846 matching lines @@
     } else if (graphicsLayer == m_scrollLayer.get()) {
         name = "LocalFrame Scrolling Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink