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 d37c506630a9dfdfef1d643462d78d2143eec193..c079c45a8dc3a093c1e40d014338ff64a531a0f9 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -1622,6 +1622,9 @@ 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;