Add feature use counting for window.external.AddSearchProvider (Blink side).

third_party/WebKit/Source/web/WebLocalFrameImpl.cpp

Index: third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp b/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
index 56619e311285df3bc84cb4858f117d5a55c5e954..2b57065fad135f486f3d50ceff04819f7f3c2b19 100644
--- a/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
+++ b/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
@@ -119,6 +119,7 @@
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/Settings.h"
+#include "core/frame/UseCounter.h"
 #include "core/html/HTMLAnchorElement.h"
 #include "core/html/HTMLCollection.h"
 #include "core/html/HTMLFormElement.h"
@@ -1640,6 +1641,20 @@ WebString WebLocalFrameImpl::layerTreeAsText(bool showDebugInfo) const
     return WebString(frame()->layerTreeAsText(showDebugInfo ? LayerTreeIncludesDebugInfo : LayerTreeNormal));
 }
 
+void WebLocalFrameImpl::countFeatureUse(WebFrame::Feature feature)
+{
+    UseCounter::Feature internalFeature = UseCounter::NumberOfFeatures;
+    switch (feature) {
+    case ExternalAddSearchProvider:
+        internalFeature = UseCounter::ExternalAddSearchProvider;
+        break;
+    case ExternalIsSearchProviderInstalled:
+        internalFeature = UseCounter::ExternalIsSearchProviderInstalled;
+        break;
+    }
+    UseCounter::count(frame(), internalFeature);
+}
+
 // WebLocalFrameImpl public ---------------------------------------------------------
 
 WebLocalFrame* WebLocalFrame::create(WebTreeScopeType scope, WebFrameClient* client)