Preliminary paint property walk implementation for SPv2

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

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index 8628654867586e554f1c3f330134d095856b5790..1bc46d4a06e421790985a171a7132b6f5e440ee3 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -76,6 +76,7 @@
 #include "core/page/scrolling/ScrollingCoordinator.h"
 #include "core/paint/FramePainter.h"
 #include "core/paint/PaintLayer.h"
+#include "core/paint/PaintPropertyTreeBuilder.h"
 #include "core/style/ComputedStyle.h"
 #include "core/svg/SVGDocumentExtensions.h"
 #include "core/svg/SVGSVGElement.h"
@@ -2478,9 +2479,9 @@ void FrameView::updatePaintProperties()
 {
     ASSERT(RuntimeEnabledFeatures::slimmingPaintV2Enabled());
 
-    forAllFrameViews([](FrameView& frameView) { frameView.lifecycle().advanceTo(DocumentLifecycle::InUpdatePaintProperties); });
-    // TODO(pdr): Calculate the paint properties by walking the layout tree.
-    forAllFrameViews([](FrameView& frameView) { frameView.lifecycle().advanceTo(DocumentLifecycle::UpdatePaintPropertiesClean); });
+    lifecycle().advanceTo(DocumentLifecycle::InUpdatePaintProperties);
+    PaintPropertyTreeBuilder().buildPropertyTrees(*this);
+    lifecycle().advanceTo(DocumentLifecycle::UpdatePaintPropertiesClean);
 }
 
 void FrameView::synchronizedPaint(const LayoutRect* interestRect)