Add browser test for WebUI URL logging

chrome/browser/ui/webui/log_web_ui_url.h

Index: chrome/browser/ui/webui/log_web_ui_url.h
diff --git a/chrome/browser/ui/webui/log_web_ui_url.h b/chrome/browser/ui/webui/log_web_ui_url.h
index a5e5dce507040573e383d7e8739a83cbbe7ecd65..a4c0f9b6931bc604ac7d2a2bfa4f5f4327a0c018 100644
--- a/chrome/browser/ui/webui/log_web_ui_url.h
+++ b/chrome/browser/ui/webui/log_web_ui_url.h
@@ -5,15 +5,21 @@
 #ifndef CHROME_BROWSER_UI_WEBUI_LOG_WEB_UI_URL_H_
 #define CHROME_BROWSER_UI_WEBUI_LOG_WEB_UI_URL_H_
 
+#include "base/callback.h"

[Dan Beam, 2015/09/26 23:02:14]

callback_forward wasn't working for me

+
 class GURL;
 
 namespace webui {
 
+typedef base::Callback<uint32(const GURL&)> WebUIUrlHash;
+
 // Called when WebUI objects are created to get aggregate usage data (i.e. is
 // chrome://history used more than chrome://help?). Only internal (e.g.
 // chrome://) URLs are logged. Returns whether the URL was actually logged.
 bool LogWebUIUrl(const GURL& web_ui_url);
 
+void SetHashFunctionForTesting(const WebUIUrlHash& testing_hash);
+
 }  // namespace webui
 
 #endif  // CHROME_BROWSER_UI_WEBUI_LOG_WEB_UI_URL_H_