[SPInvalidation] Update paint properties when full screen status changes

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 637 matching lines @@
 }
 
 void FrameView::setContentsSize(const IntSize& size) {
   if (size == contentsSize())
     return;
 
   m_contentsSize = size;
   updateScrollbars();
   ScrollableArea::contentsResized();
 
-  if (RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled() &&
-      !RuntimeEnabledFeatures::rootLayerScrollingEnabled())
-    setNeedsPaintPropertyUpdate();
-
   Page* page = frame().page();
   if (!page)
     return;
 
   updateParentScrollableAreaSet();
 
   page->chromeClient().contentsSizeChanged(m_frame.get(), size);
 
   // Ensure the scrollToFragmentAnchor is called before
   // restoreScrollPositionAndViewState when reload
@@ skipping 3338 matching lines @@
       scrollOriginChanged())
     updateScrollbars();
 }
 
 void FrameView::updateScrollbars() {
   m_needsScrollbarsUpdate = false;
 
   if (RuntimeEnabledFeatures::rootLayerScrollingEnabled())
     return;
 
+  if (RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled())
+    setNeedsPaintPropertyUpdate();

[Xianzhu, 2016/12/21 23:46:34]

This is moved here because updateScrollbars() is called when scroll paint
properties may change, e.g. from setScrollbarMode() which affects
userScrollable(Horizontal|Vertical). Didn't find a failed case though.

+
   // Avoid drawing two sets of scrollbars when visual viewport is enabled.
   if (visualViewportSuppliesScrollbars()) {
     m_scrollbarManager.setHasHorizontalScrollbar(false);
     m_scrollbarManager.setHasVerticalScrollbar(false);
     adjustScrollOffsetFromUpdateScrollbars();
     return;
   }
 
   if (m_inUpdateScrollbars)
     return;
@@ skipping 846 matching lines @@
        reason < MainThreadScrollingReason::kMainThreadScrollingReasonCount;
        ++reason) {
     if (m_mainThreadScrollingReasonsCounter[reason] > 0) {
       reasons |= 1 << (reason - 1);
     }
   }
   return reasons;
 }
 
 }  // namespace blink