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

chrome/renderer/external_extension.cc

Index: chrome/renderer/external_extension.cc
diff --git a/chrome/renderer/external_extension.cc b/chrome/renderer/external_extension.cc
index 014d388f581c7150bd237603c2fcc42dd813aff3..ef02cac8703f7b597daca8ef82eb37a5d7a912e5 100644
--- a/chrome/renderer/external_extension.cc
+++ b/chrome/renderer/external_extension.cc
@@ -116,6 +116,7 @@ void ExternalExtensionWrapper::AddSearchProvider(
 
   GURL osdd_url = GURL(webframe->document().url()).Resolve(osdd_string);
   if (!osdd_url.is_empty() && osdd_url.is_valid()) {
+    webframe->didCallAddSearchProvider();
     render_view->Send(new ChromeViewHostMsg_PageHasOSDD(
         render_view->GetRoutingID(), webframe->document().url(), osdd_url,
         search_provider::EXPLICIT_PROVIDER));
@@ -144,11 +145,10 @@ void ExternalExtensionWrapper::IsSearchProviderInstalled(
   search_provider::InstallState install = search_provider::DENIED;
   GURL inquiry_url = GURL(webframe->document().url()).Resolve(name);
   if (!inquiry_url.is_empty()) {
-      render_view->Send(new ChromeViewHostMsg_GetSearchProviderInstallState(
-          render_view->GetRoutingID(),
-          webframe->document().url(),
-          inquiry_url,
-          &install));
+    webframe->didCallIsSearchProviderInstalled();
+    render_view->Send(new ChromeViewHostMsg_GetSearchProviderInstallState(
+        render_view->GetRoutingID(), webframe->document().url(), inquiry_url,
+        &install));
   }
 
   if (install == search_provider::DENIED) {