Schedule animation when setting base background color, rather than forcing an update.

third_party/WebKit/Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 1875 matching lines @@
     }
 
     if (relayoutRoot == layoutView)
         m_layoutSubtreeRootList.clearAndMarkContainingBlocksForLayout();
     else
         m_layoutSubtreeRootList.add(*relayoutRoot);
 
     if (m_layoutSchedulingEnabled) {
         m_hasPendingLayout = true;
 
-        page()->animator().scheduleVisualUpdate(m_frame.get());
+        if (!shouldThrottleRendering())
+            page()->animator().scheduleVisualUpdate(m_frame.get());
+
         lifecycle().ensureStateAtMost(DocumentLifecycle::StyleClean);
     }
     TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "InvalidateLayout", TRACE_EVENT_SCOPE_THREAD, "data", InspectorInvalidateLayoutEvent::data(m_frame.get()));
 }
 
 bool FrameView::layoutPending() const
 {
     // FIXME: This should check Document::lifecycle instead.
     return m_hasPendingLayout;
 }
@@ skipping 58 matching lines @@
 {
     m_baseBackgroundColor = backgroundColor;
 
     if (!layoutViewItem().isNull() && layoutViewItem().layer()->hasCompositedLayerMapping()) {
         CompositedLayerMapping* compositedLayerMapping = layoutViewItem().layer()->compositedLayerMapping();
         compositedLayerMapping->updateContentsOpaque();
         if (compositedLayerMapping->mainGraphicsLayer())
             compositedLayerMapping->mainGraphicsLayer()->setNeedsDisplay();
     }
     recalculateScrollbarOverlayStyle(documentBackgroundColor());
+
+    if (!shouldThrottleRendering())
+        page()->animator().scheduleVisualUpdate(m_frame.get());
 }
 
 void FrameView::updateBackgroundRecursively(const Color& backgroundColor, bool transparent)
 {
     forAllNonThrottledFrameViews([backgroundColor, transparent](FrameView& frameView) {
         frameView.setTransparent(transparent);
         frameView.setBaseBackgroundColor(backgroundColor);
     });
 }
 
@@ skipping 2291 matching lines @@
 }
 
 bool FrameView::canThrottleRendering() const
 {
     if (!RuntimeEnabledFeatures::renderingPipelineThrottlingEnabled())
         return false;
     return m_subtreeThrottled || (m_hiddenForThrottling && m_crossOriginForThrottling);
 }
 
 } // namespace blink