Force the video to go fullscreen when setting persistent video

content/renderer/media/renderer_webmediaplayer_delegate_browsertest.cc

 // 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 <tuple>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
 #include "base/run_loop.h"
@@ skipping 26 matching lines @@
   ~MockWebMediaPlayerDelegateObserver() {}
 
   // WebMediaPlayerDelegate::Observer implementation.
   MOCK_METHOD0(OnFrameHidden, void());
   MOCK_METHOD0(OnFrameClosed, void());
   MOCK_METHOD0(OnFrameShown, void());
   MOCK_METHOD0(OnIdleTimeout, void());
   MOCK_METHOD0(OnPlay, void());
   MOCK_METHOD0(OnPause, void());
   MOCK_METHOD1(OnVolumeMultiplierUpdate, void(double));
+  MOCK_METHOD1(OnBecamePersistentVideo, void(bool));
 };
 
 class RendererWebMediaPlayerDelegateTest : public content::RenderViewTest {
  public:
   RendererWebMediaPlayerDelegateTest() {}
   ~RendererWebMediaPlayerDelegateTest() override {}
 
   void SetUp() override {
     RenderViewTest::SetUp();
     // Start the tick clock off at a non-null value.
@@ skipping 245 matching lines @@
                              MediaContentType::Persistent);
   RunLoopOnce();
   delegate_manager_->SetFrameHiddenForTesting(false);
   RunLoopOnce();
   histogram_tester.ExpectTotalCount("Media.Android.BackgroundVideoTime", 2);
 }
 
 #endif  // OS_ANDROID
 
 }  // namespace media