OverscrollGlow for mainThread-{BLINK CHANGES}

Source/web/WebPluginScrollbarImpl.cpp

Index: Source/web/WebPluginScrollbarImpl.cpp
diff --git a/Source/web/WebPluginScrollbarImpl.cpp b/Source/web/WebPluginScrollbarImpl.cpp
index 3b136b784d54369e314910ae5496743a526ddeb7..f51da7be94b3f8bea4dfa97d0a7e432600b23d47 100644
--- a/Source/web/WebPluginScrollbarImpl.cpp
+++ b/Source/web/WebPluginScrollbarImpl.cpp
@@ -358,7 +358,7 @@ bool WebPluginScrollbarImpl::onKeyDown(const WebInputEvent& event)
     blink::ScrollGranularity scrollGranularity;
     if (WebViewImpl::mapKeyCodeForScroll(keyCode, &scrollDirection, &scrollGranularity)) {
         // Will return false if scroll direction wasn't compatible with this scrollbar.
-        return m_group->scroll(scrollDirection, scrollGranularity);
+        return m_group->scroll(scrollDirection, scrollGranularity).didScroll;
     }
     return false;
 }