Disallow throttling while running requestAnimationFrame callbacks

third_party/WebKit/Source/core/page/PageAnimator.cpp

 // Copyright 2014 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 "core/page/PageAnimator.h"
 
 #include "core/animation/DocumentAnimations.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/page/ChromeClient.h"
@@ skipping 29 matching lines @@
     for (Frame* frame = m_page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
         if (frame->isLocalFrame())
             documents.append(toLocalFrame(frame)->document());
     }
 
     for (auto& document : documents) {
         DocumentAnimations::updateAnimationTimingForAnimationFrame(*document);
         if (document->view()) {
             if (document->view()->shouldThrottleRendering())
                 continue;
+            // Disallow throttling in case any script needs to do a synchronous
+            // lifecycle update in other frames which are throttled.
+            DocumentLifecycle::DisallowThrottlingScope noThrottlingScope(document->lifecycle());
             document->view()->getScrollableArea()->serviceScrollAnimations(monotonicAnimationStartTime);
 
             if (const FrameView::ScrollableAreaSet* animatingScrollableAreas = document->view()->animatingScrollableAreas()) {
                 // Iterate over a copy, since ScrollableAreas may deregister
                 // themselves during the iteration.
                 HeapVector<Member<ScrollableArea>> animatingScrollableAreasCopy;
                 copyToVector(*animatingScrollableAreas, animatingScrollableAreasCopy);
                 for (ScrollableArea* scrollableArea : animatingScrollableAreasCopy)
                     scrollableArea->serviceScrollAnimations(monotonicAnimationStartTime);
             }
             SVGDocumentExtensions::serviceOnAnimationFrame(*document);
         }
         // TODO(skyostil): This function should not run for documents without views.
+        DocumentLifecycle::DisallowThrottlingScope noThrottlingScope(document->lifecycle());
         document->serviceScriptedAnimations(monotonicAnimationStartTime);
     }
 
     // Oilpan: This is performance optimization to promptly clear the backing
     // storage of the vector and reuse it in the next PageAnimator::serviceScriptedAnimations.
     documents.clear();
 }
 
 void PageAnimator::scheduleVisualUpdate(LocalFrame* frame)
 {
     if (m_servicingAnimations || m_updatingLayoutAndStyleForPainting)
         return;
     m_page->chromeClient().scheduleAnimation(frame->view());
 }
 
 void PageAnimator::updateAllLifecyclePhases(LocalFrame& rootFrame)
 {
     FrameView* view = rootFrame.view();
     TemporaryChange<bool> servicing(m_updatingLayoutAndStyleForPainting, true);
     view->updateAllLifecyclePhases();
 }
 
 } // namespace blink