Preparation CL for WebRTC performance test using promise-based getStats

chrome/browser/media/webrtc/webrtc_browsertest_base.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/media/webrtc/webrtc_browsertest_base.h"
 
 #include <stddef.h>
 
 #include "base/json/json_reader.h"
 #include "base/lazy_instance.h"
@@ skipping 476 matching lines @@
   EXPECT_EQ("ok-got-stats", ExecuteJavascript("verifyStatsGenerated()", tab));
 }
 
 std::vector<std::string> WebRtcTestBase::VerifyStatsGeneratedPromise(
     content::WebContents* tab) const {
   std::string result = ExecuteJavascript("verifyStatsGeneratedPromise()", tab);
   EXPECT_TRUE(base::StartsWith(result, "ok-", base::CompareCase::SENSITIVE));
   return JsonArrayToVectorOfStrings(result.substr(3));
 }
 
+scoped_refptr<content::RTCStatsReportDictionary>
+WebRtcTestBase::GetStatsReportDictionary(content::WebContents* tab) const {
+  std::string result = ExecuteJavascript("getStatsAsDictionary()", tab);

[hbos_chromium, 2016/11/30 11:30:56]

nit: I'll rename this to getStatsReportDictionary so the .cc and .js layers have
matching names.

+  EXPECT_TRUE(base::StartsWith(result, "ok-", base::CompareCase::SENSITIVE));
+  std::unique_ptr<base::Value> parsed_json = base::JSONReader::Read(
+      result.substr(3));
+  base::DictionaryValue* dictionary;
+  CHECK(parsed_json);
+  CHECK(parsed_json->GetAsDictionary(&dictionary));
+  ignore_result(parsed_json.release());
+  return scoped_refptr<content::RTCStatsReportDictionary>(
+      new content::RTCStatsReportDictionary(
+          std::unique_ptr<base::DictionaryValue>(dictionary)));
+}
+
 std::vector<std::string> WebRtcTestBase::GetWhitelistedStatsTypes(
     content::WebContents* tab) const {
   return JsonArrayToVectorOfStrings(
       ExecuteJavascript("getWhitelistedStatsTypes()", tab));
 }
 
 void WebRtcTestBase::SetDefaultVideoCodec(
     content::WebContents* tab,
     const std::string& video_codec) const {
   EXPECT_EQ("ok-forced",
             ExecuteJavascript("forceVideoCodec('" + video_codec + "')", tab));
 }
 
 void WebRtcTestBase::EnableOpusDtx(content::WebContents* tab) const {
   EXPECT_EQ("ok-forced", ExecuteJavascript("forceOpusDtx()", tab));
 }