Bug 827158 part 6. Add a telemetry ping for object/embed callability actually working. r=bsmedberg

dom/base/nsDOMClassInfo.cpp

@@ -71,6 +71,7 @@
 #include "mozilla/Preferences.h"
 #include "nsLocation.h"
 #include "mozilla/Attributes.h"
+#include "mozilla/Telemetry.h"
 
 // Window scriptable helper includes
 #include "nsIDocShell.h"
@@ -8061,6 +8062,9 @@ nsHTMLPluginObjElementSH::DoCall(nsIXPConnectWrappedNative *wrapper,
   // the real this parameter from JS (argv[-1]) here.
   JSAutoRequest ar(cx);
   *_retval = ::JS::Call(cx, thisVal, pi_obj, argc, argv, vp);
+  if (*_retval) {
+    Telemetry::Accumulate(Telemetry::PLUGIN_CALLED_DIRECTLY, true);
+  }
 
   return NS_OK;
 }

toolkit/components/telemetry/Histograms.json

@@ -1600,6 +1600,10 @@
     "extended_statistics_ok": true,
     "description": "Time spent shutting down plugins (ms)"
   },
+  "PLUGIN_CALLED_DIRECTLY": {
+    "kind": "flag",
+    "description": "A plugin object was successfully invoked as a function"
+  },
   "MOZ_SQLITE_OPEN_MS": {
     "kind": "exponential",
     "high": "3000",