Turn off the old compositing path for SPv2.

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

Index: third_party/WebKit/Source/core/paint/FramePainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/FramePainter.cpp b/third_party/WebKit/Source/core/paint/FramePainter.cpp
index 436dd0fb75d1da83426222ef76a93a4de1d2c16c..54124d2cd77f5f69725f715643354994784664de 100644
--- a/third_party/WebKit/Source/core/paint/FramePainter.cpp
+++ b/third_party/WebKit/Source/core/paint/FramePainter.cpp
@@ -49,8 +49,13 @@ void FramePainter::paint(GraphicsContext& context, const GlobalPaintFlags global
             TransformPaintPropertyNode* transform = m_frameView->scrollTranslation() ? m_frameView->scrollTranslation() : m_frameView->preTranslation();
             ClipPaintPropertyNode* clip = m_frameView->contentClip();
             ScrollPaintPropertyNode* scroll = m_frameView->scroll();
+            PaintChunkProperties properties(context.getPaintController().currentPaintChunkProperties());
+            if (frameView().frame().isLocalRoot()) {

[pdr., 2016/09/21 20:56:31]

Why was this needed?

[chrishtr, 2016/09/21 21:08:50]

Without this, it could be that painting occurred outside of an effect
(subsequence markers for
the root PaintLayer of the page). I added this to ensure that state.

+                properties.transform = frameView().rootTransform();
+                properties.clip = frameView().rootClip();
+                properties.effect = frameView().rootEffect();
+            }
             if (transform || clip || scroll) {
-                PaintChunkProperties properties(context.getPaintController().currentPaintChunkProperties());
                 if (transform)
                     properties.transform = transform;
                 if (scroll)
@@ -113,7 +118,7 @@ void FramePainter::paintContents(GraphicsContext& context, const GlobalPaintFlag
 
     // TODO(wangxianzhu): The following check should be stricter, but currently this is blocked
     // by the svg root issue (crbug.com/442939).
-    ASSERT(document->lifecycle().state() >= DocumentLifecycle::CompositingClean);
+    DCHECK(document->lifecycle().state() >= DocumentLifecycle::CompositingClean);
 
     TRACE_EVENT1("devtools.timeline,rail", "Paint", "data", InspectorPaintEvent::data(layoutView, LayoutRect(rect), 0));