Final batch adding real histogram values for extension events.

extensions/browser/extensions_browser_client.h

Index: extensions/browser/extensions_browser_client.h
diff --git a/extensions/browser/extensions_browser_client.h b/extensions/browser/extensions_browser_client.h
index 4aefa37e7ad8759f3364511488ca206965b96334..883afc85ff54eb7feafde813b794980bb6d00b79 100644
--- a/extensions/browser/extensions_browser_client.h
+++ b/extensions/browser/extensions_browser_client.h
@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
+#include "extensions/browser/extension_event_histogram_value.h"
 #include "extensions/browser/extension_prefs_observer.h"
 
 class ExtensionFunctionRegistry;
@@ -196,7 +197,8 @@ class ExtensionsBrowserClient {
 
   // Propagate a event to all the renderers in every browser context. The
   // implementation must be safe to call from any thread.
-  virtual void BroadcastEventToRenderers(const std::string& event_name,
+  virtual void BroadcastEventToRenderers(events::HistogramValue histogram_value,
+                                         const std::string& event_name,
                                          scoped_ptr<base::ListValue> args) = 0;
 
   // Returns the embedder's net::NetLog.