Turn on render throttling for iframes with pending sheets.

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

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights
    reserved.
 
    This library is free software; you can redistribute it and/or
@@ skipping 663 matching lines @@
   // Returns true if this frame could potentially skip rendering and avoid
   // scheduling visual updates.
   bool canThrottleRendering() const;
   bool isHiddenForThrottling() const { return m_hiddenForThrottling; }
   void setupRenderThrottling();
 
   // For testing, run pending intersection observer notifications for this
   // frame.
   void updateRenderThrottlingStatusForTesting();
 
+  void beginLifecycleUpdates();
+
   // Paint properties for SPv2 Only.
   void setPreTranslation(
       PassRefPtr<TransformPaintPropertyNode> preTranslation) {
     m_preTranslation = preTranslation;
   }
   TransformPaintPropertyNode* preTranslation() const {
     return m_preTranslation.get();
   }
 
   void setScrollTranslation(
@@ skipping 136 matching lines @@
                                                 ScrollbarMode& hMode,
                                                 ScrollbarMode& vMode);
 
   void updateCounters();
   void forceLayoutParentViewIfNeeded();
   void performPreLayoutTasks();
   void performLayout(bool inSubtreeLayout);
   void scheduleOrPerformPostLayoutTasks();
   void performPostLayoutTasks();
 
+  void maybeRecordLoadReason();
+
   DocumentLifecycle& lifecycle() const;
 
   void contentsResized() override;
   void scrollbarExistenceDidChange();
 
   // Override Widget methods to do point conversion via layoutObjects, in order
   // to take transforms into account.
   IntRect convertToContainingWidget(const IntRect&) const override;
   IntRect convertFromContainingWidget(const IntRect&) const override;
   IntPoint convertToContainingWidget(const IntPoint&) const override;
@@ skipping 189 matching lines @@
   // Exists only on root frame.
   // TODO(bokan): crbug.com/484188. We should specialize FrameView for the
   // main frame.
   Member<RootFrameViewport> m_viewportScrollableArea;
 
   // The following members control rendering pipeline throttling for this
   // frame. They are only updated in response to intersection observer
   // notifications, i.e., not in the middle of the lifecycle.
   bool m_hiddenForThrottling;
   bool m_subtreeThrottled;
+  bool m_lifecycleUpdatesThrottled;
 
   // Paint properties for SPv2 Only.
   // The hierarchy of transform subtree created by a FrameView.
   // [ preTranslation ]               The offset from Widget::frameRect.
   //     |                            Establishes viewport.
   //     +---[ scrollTranslation ]    Frame scrolling.
   // TODO(trchen): These will not be needed once settings->rootLayerScrolls() is
   // enabled.
   RefPtr<TransformPaintPropertyNode> m_preTranslation;
   RefPtr<TransformPaintPropertyNode> m_scrollTranslation;
@@ skipping 68 matching lines @@
                   widget.isFrameView());
 DEFINE_TYPE_CASTS(FrameView,
                   ScrollableArea,
                   scrollableArea,
                   scrollableArea->isFrameView(),
                   scrollableArea.isFrameView());
 
 }  // namespace blink
 
 #endif  // FrameView_h