Throttle rendering pipeline for invisible frames

third_party/WebKit/Source/web/tests/sim/SimCompositor.cpp

 // 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.
 
 #include "config.h"
 #include "web/tests/sim/SimCompositor.h"
 
 #include "core/frame/FrameView.h"
 #include "core/layout/LayoutView.h"
 #include "core/layout/compositing/CompositedLayerMapping.h"
 #include "core/paint/PaintLayer.h"
 #include "platform/graphics/ContentLayerDelegate.h"
 #include "public/platform/WebRect.h"
 #include "web/WebLocalFrameImpl.h"
 #include "web/WebViewImpl.h"
 #include "web/tests/sim/SimDisplayItemList.h"
 #include "web/tests/sim/SimLayerTreeView.h"
 #include "wtf/CurrentTime.h"
 
 namespace blink {
 
 static void paintLayers(PaintLayer& layer, SimDisplayItemList& displayList)
 {
-    if (layer.compositingState() == PaintsIntoOwnBacking) {
+    if (layer.isAllowedToQueryCompositingState() && layer.compositingState() == PaintsIntoOwnBacking) {
         CompositedLayerMapping* mapping = layer.compositedLayerMapping();
         GraphicsLayer* graphicsLayer = mapping->mainGraphicsLayer();
         if (graphicsLayer->hasTrackedPaintInvalidations()) {
             ContentLayerDelegate* delegate = graphicsLayer->contentLayerDelegateForTesting();
             delegate->paintContents(&displayList, WebRect(0, 0, layer.size().width(), layer.size().height()));
             graphicsLayer->resetTrackedPaintInvalidations();
         }
     }
     for (PaintLayer* child = layer.firstChild(); child; child = child->nextSibling())
         paintLayers(*child, displayList);
@@ skipping 29 matching lines @@
 void SimCompositor::setWebViewImpl(WebViewImpl& webViewImpl)
 {
     m_webViewImpl = &webViewImpl;
 }
 
 SimDisplayItemList SimCompositor::beginFrame()
 {
     ASSERT(m_webViewImpl);
     ASSERT(!m_layerTreeView->deferCommits());
     ASSERT(m_layerTreeView->needsAnimate());
+    m_layerTreeView->clearNeedsAnimate();
 
     // Always advance the time as if the compositor was running at 60fps.
     m_lastFrameTimeMonotonic = monotonicallyIncreasingTime() + 0.016;
 
     m_webViewImpl->beginFrame(m_lastFrameTimeMonotonic);
     m_webViewImpl->layout();
 
     LocalFrame* root = m_webViewImpl->mainFrameImpl()->frame();
 
     SimDisplayItemList displayList;
     paintFrames(*root, displayList);
 
-    m_layerTreeView->clearNeedsAnimate();
-
     return displayList;
 }
 
 } // namespace blink