Don't try to render composited selection in throttled frame

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 14b33c8c7adbfe0af35e7a21b82c6961bd0faccf..45243b4bf7ff3cdb056b22d75224a0aa2e13df8d 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -1613,6 +1613,9 @@ void FrameView::updateLayersAndCompositingAfterScrollIfNeeded()
 
 bool FrameView::computeCompositedSelection(LocalFrame& frame, CompositedSelection& selection)
 {
+    if (frame.view()->shouldThrottleRendering())
+        return false;
+
     const VisibleSelection& visibleSelection = frame.selection().selection();
     if (!visibleSelection.isCaretOrRange())
         return false;