Add use counter for chrome.loadTimes

chrome/renderer/loadtimes_extension_bindings.cc

Index: chrome/renderer/loadtimes_extension_bindings.cc
diff --git a/chrome/renderer/loadtimes_extension_bindings.cc b/chrome/renderer/loadtimes_extension_bindings.cc
index 61d54a9fabfa6c0a1889c8fd472c021831e7cdc1..2b6259556a67358e8aeeaa3a2cbffbc51cc8b073 100644
--- a/chrome/renderer/loadtimes_extension_bindings.cc
+++ b/chrome/renderer/loadtimes_extension_bindings.cc
@@ -109,7 +109,10 @@ class LoadTimesExtensionWrapper : public v8::Extension {
   static void LoadtimesGetter(
       v8::Local<v8::Name> name,
       const v8::PropertyCallbackInfo<v8::Value>& info) {
-    // TODO(panicker): Add Usage counter.
+    if (WebLocalFrame* frame = WebLocalFrame::frameForCurrentContext()) {
+      frame->usageCountChromeLoadTimes(blink::WebString::fromUTF8(
+          *v8::String::Utf8Value(name)));
+    }
     info.GetReturnValue().Set(info.Data());
   }