Fully (?) fix overflow: auto with delayed scroll updates

third_party/WebKit/Source/core/layout/LayoutBlock.cpp

Index: third_party/WebKit/Source/core/layout/LayoutBlock.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBlock.cpp b/third_party/WebKit/Source/core/layout/LayoutBlock.cpp
index 9793a7e6714b61b6a6e07379afc26ae23cf00e83..804f9d8ad382c353a6aa72b918b5360ea415d6fa 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBlock.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBlock.cpp
@@ -837,8 +837,10 @@ void LayoutBlock::startDelayUpdateScrollInfo()
     ++gDelayUpdateScrollInfo;
 }
 
-void LayoutBlock::finishDelayUpdateScrollInfo()
+bool LayoutBlock::finishDelayUpdateScrollInfo(SubtreeLayoutScope* layoutScope)
 {
+    bool didMarking = false;

[leviw_travelin_and_unemployed, 2016/02/25 21:31:28]

This could have a better name.

[cbiesinger, 2016/02/25 21:33:13]

Done.

+
     --gDelayUpdateScrollInfo;
     ASSERT(gDelayUpdateScrollInfo >= 0);
     if (gDelayUpdateScrollInfo == 0) {
@@ -849,10 +851,11 @@ void LayoutBlock::finishDelayUpdateScrollInfo()
 
         for (auto* block : *infoSet) {
             if (block->hasOverflowClip()) {
-                block->layer()->scrollableArea()->updateAfterLayout();
+                didMarking |= block->layer()->scrollableArea()->updateAfterLayout(layoutScope);
             }
         }
     }
+    return didMarking;
 }
 
 void LayoutBlock::updateScrollInfoAfterLayout()