Fix touch event flag may not be updated correctly by transform which causes no layout

third_party/WebKit/Source/core/paint/PaintLayer.cpp

Index: third_party/WebKit/Source/core/paint/PaintLayer.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayer.cpp b/third_party/WebKit/Source/core/paint/PaintLayer.cpp
index 93800eb5ff14d38e2bfe071ea20fdd5e1c5ad68f..126fc44fbc2fb8cfd12ce28ca949203c9c2b6bbb 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayer.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayer.cpp
@@ -418,6 +418,10 @@ void PaintLayer::updateTransform(const ComputedStyle* oldStyle,
 
   if (FrameView* frameView = layoutObject()->document().view())
     frameView->setNeedsUpdateWidgetGeometries();
+
+  if (ScrollingCoordinator* scrollingCoordinator =
+          layoutObject()->frame()->page()->scrollingCoordinator())
+    scrollingCoordinator->checkTransformChangedDueToTouchEvent(this);

[majidvp, 2017/01/04 16:48:51]

Is t really enough to notify ScrollingCoordinator when a PaintLayer transform
changes?

What about cases where a layout object transform is changed but it does not have
a layer. I think
in those cases we still compute touch rects but in enclosing layer's space. I
imagine those rects
need to be updated, no?

[yigu, 2017/01/05 14:05:43]

As we discussed, this part of logic has been moved to layoutBox.

 }
 
 static PaintLayer* enclosingLayerForContainingBlock(PaintLayer* layer) {