Collect host of Web Component usage to send to RAPPOR

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index 6cffdfffd94cedcf11e41510ef3ce289e93b8e6b..24c4d5748213346e590b17c674f2c376a1a3550a 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -84,6 +84,7 @@
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/OriginsUsingFeatures.h"
 #include "core/frame/PinchViewport.h"
 #include "core/frame/ScrollToOptions.h"
 #include "core/frame/Settings.h"
@@ -1771,6 +1772,12 @@ CustomElementDefinition* Element::customElementDefinition() const
     return nullptr;
 }
 
+PassRefPtrWillBeRawPtr<ShadowRoot> Element::createShadowRoot(ScriptState* scriptState, ExceptionState& exceptionState)
+{
+    OriginsUsingFeatures::count(scriptState, document(), OriginsUsingFeatures::Feature::ElementCreateShadowRoot);
+    return createShadowRoot(exceptionState);
+}
+
 PassRefPtrWillBeRawPtr<ShadowRoot> Element::createShadowRoot(ExceptionState& exceptionState)
 {
     if (alwaysCreateClosedShadowRoot())