(WIP) Invalidation during painting (for synchronized painting)

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

Index: third_party/WebKit/Source/core/frame/FrameView.h
diff --git a/third_party/WebKit/Source/core/frame/FrameView.h b/third_party/WebKit/Source/core/frame/FrameView.h
index bb4943f1117c9d1082d8d0242211e3e8326297a9..e9fc5d1d99cf92a8ae0a2838de882ecd3f9a906f 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.h
+++ b/third_party/WebKit/Source/core/frame/FrameView.h
@@ -579,6 +579,13 @@ public:
     bool canThrottleRendering() const;
     bool isHiddenForThrottling() const { return m_hiddenForThrottling; }
 
+    void invalidatePaintIfNeeded();
+    void invalidatePaintIfNeededForSlimmingPaintV2() const
+    {
+        ASSERT(RuntimeEnabledFeatures::slimmingPaintV2Enabled());
+        const_cast<FrameView*>(this)->invalidatePaintIfNeeded();
+    }
+
     // Paint properties for SPv2 Only.
     void setPreTranslation(PassRefPtr<TransformPaintPropertyNode> preTranslation) { m_preTranslation = preTranslation; }
     TransformPaintPropertyNode* preTranslation() const { return m_preTranslation.get(); }