TestingPlatformSupport: register Platform instance correctly

third_party/WebKit/Source/modules/webaudio/BaseAudioContextTest.cpp

 // Copyright 2016 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 "modules/webaudio/BaseAudioContext.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/DocumentUserGestureToken.h"
 #include "core/frame/FrameOwner.h"
 #include "core/frame/FrameTypes.h"
@@ skipping 62 matching lines @@
   double audioHardwareSampleRate() override { return 44100; }
 };
 
 }  // anonymous namespace
 
 class BaseAudioContextTest : public ::testing::Test {
  protected:
   using AutoplayStatus = BaseAudioContext::AutoplayStatus;
 
   void SetUp() override {
+    m_testPlatform.reset(new BaseAudioContextTestPlatform);
     m_dummyPageHolder = DummyPageHolder::create();
     m_dummyFrameOwner = DummyFrameOwner::create();
     document().updateSecurityOrigin(
         SecurityOrigin::create("https", "example.com", 80));
   }
 
   void TearDown() override {
     if (m_childFrame) {
       m_childDocumentLoader->detachFromFrame();
       m_childDocumentLoader.clear();
@@ skipping 31 matching lines @@
     audioContext->recordAutoplayStatus();
   }
 
  private:
   std::unique_ptr<DummyPageHolder> m_dummyPageHolder;
   Persistent<DummyFrameOwner> m_dummyFrameOwner;
 
   Persistent<LocalFrame> m_childFrame;
   Persistent<DocumentLoader> m_childDocumentLoader;
 
-  BaseAudioContextTestPlatform m_testPlatform;
+  ScopedTestingPlatformSupport<BaseAudioContextTestPlatform> m_testPlatform;
 };
 
 TEST_F(BaseAudioContextTest, AutoplayMetrics_NoRestriction) {
   HistogramTester histogramTester;
 
   BaseAudioContext* audioContext =
       BaseAudioContext::create(document(), ASSERT_NO_EXCEPTION);
   recordAutoplayStatus(audioContext);
 
   histogramTester.expectTotalCount(kCrossOriginMetric, 0);
@@ skipping 141 matching lines @@
   audioContext->resumeContext(getScriptStateFrom(childDocument()));
   rejectPendingResolvers(audioContext);
   recordAutoplayStatus(audioContext);
 
   histogramTester.expectBucketCount(kCrossOriginMetric,
                                     AutoplayStatus::AutoplayStatusSucceeded, 1);
   histogramTester.expectTotalCount(kCrossOriginMetric, 1);
 }
 
 }  // namespace blink