Allow local root FrameView to be throttled

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 751d7fbc54fe6d686ae3dfce1f3aa58535b4cab5..9589f06d2d7e5a58046d3720dafed54b40d6db10 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -2375,6 +2375,11 @@ void FrameView::updateLifecyclePhasesInternal(LifeCycleUpdateOption phases)
     // Updating layout can run script, which can tear down the FrameView.
     RefPtrWillBeRawPtr<FrameView> protector(this);
 
+    if (shouldThrottleRendering()) {
+        updateViewportIntersectionsForSubtree();
+        return;
+    }
+
     updateStyleAndLayoutIfNeededRecursive();
     ASSERT(lifecycle().state() >= DocumentLifecycle::LayoutClean);