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..fa2de3141df7e4b876b0b31f2ba2668fe7712724 100644
--- a/chrome/renderer/loadtimes_extension_bindings.cc
+++ b/chrome/renderer/loadtimes_extension_bindings.cc
@@ -109,7 +109,11 @@ class LoadTimesExtensionWrapper : public v8::Extension {
   static void LoadtimesGetter(
       v8::Local<v8::Name> name,
       const v8::PropertyCallbackInfo<v8::Value>& info) {
-    // TODO(panicker): Add Usage counter.
+    WebLocalFrame* frame = WebLocalFrame::frameForCurrentContext();
+    if (frame) {

[esprehn, 2016/08/05 20:57:36]

I'd usually write:

if (WebLocalFrame* frame = WebLocalFrame::frameForCurrentContext()) {
  // ...
}

but you can do this if you want :)

[panicker, 2016/08/05 23:06:14]

Sure, updated.

+      frame->usageCountChromeLoadtimes(blink::WebString::fromUTF8(
+          *v8::String::Utf8Value(name)));
+    }
     info.GetReturnValue().Set(info.Data());
   }