Preparation CL for WebRTC performance test using promise-based getStats

chrome/browser/media/webrtc/webrtc_browsertest_base.h

Index: chrome/browser/media/webrtc/webrtc_browsertest_base.h
diff --git a/chrome/browser/media/webrtc/webrtc_browsertest_base.h b/chrome/browser/media/webrtc/webrtc_browsertest_base.h
index 0060ac31c3f44afecf5640b8ccb069414e7833b3..1f1dd8cf7ac5ea2acc15cc5f21208fb60eea7290 100644
--- a/chrome/browser/media/webrtc/webrtc_browsertest_base.h
+++ b/chrome/browser/media/webrtc/webrtc_browsertest_base.h
@@ -6,8 +6,11 @@
 #define CHROME_BROWSER_MEDIA_WEBRTC_WEBRTC_BROWSERTEST_BASE_H_
 
 #include <string>
+#include <vector>
 
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "chrome/browser/media/webrtc/test_stats_dictionary.h"
 #include "chrome/test/base/in_process_browser_test.h"
 
 namespace infobars {
@@ -166,6 +169,8 @@ class WebRtcTestBase : public InProcessBrowserTest {
   void VerifyStatsGeneratedCallback(content::WebContents* tab) const;
   std::vector<std::string> VerifyStatsGeneratedPromise(
       content::WebContents* tab) const;
+  scoped_refptr<content::TestStatsReportDictionary> GetStatsReportDictionary(
+      content::WebContents* tab) const;
   std::vector<std::string> GetWhitelistedStatsTypes(
       content::WebContents* tab) const;