Move media_stream_video_webrtc_sink_unittest.cc to Blink

This wraps up Onion souping of
media_stream_video_webrtc_sink_unittest.cc|h that happened on [1], but
was blocked on [2] - now fixed.

[1] https://crrev.com/c/1811179
[2] https://crrev.com/c/1816789

BUG=787254
R=guidou@chromium.org, haraken@chromium.org

Change-Id: I4302207403f614cdac329be3cb591a13f13db52b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816793
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704833}

content/test/BUILD.gn

@@ -1944,7 +1944,6 @@ test("content_unittests") {
     "../renderer/media/webrtc/fake_rtc_rtp_transceiver.h",
     "../renderer/media/webrtc/media_stream_remote_video_source_unittest.cc",
     "../renderer/media/webrtc/media_stream_track_metrics_unittest.cc",
-    "../renderer/media/webrtc/media_stream_video_webrtc_sink_unittest.cc",
     "../renderer/media/webrtc/peer_connection_dependency_factory_unittest.cc",
     "../renderer/media/webrtc/peer_connection_tracker_unittest.cc",
     "../renderer/media/webrtc/rtc_peer_connection_handler_unittest.cc",

third_party/blink/renderer/modules/BUILD.gn

@@ -381,6 +381,7 @@ jumbo_source_set("unit_tests") {
     "peerconnection/adapters/quic_packet_transport_adapter_test.cc",
     "peerconnection/byte_buffer_queue_test.cc",
     "peerconnection/call_setup_state_tracker_unittest.cc",
+    "peerconnection/media_stream_video_webrtc_sink_test.cc",
     "peerconnection/rtc_data_channel_test.cc",
     "peerconnection/rtc_ice_transport_test.cc",
     "peerconnection/rtc_ice_transport_test.h",

content/renderer/media/webrtc/media_stream_video_webrtc_sink_unittest.cc → third_party/blink/renderer/modules/peerconnection/media_stream_video_webrtc_sink_test.cc

@@ -4,22 +4,17 @@
 
 #include "third_party/blink/public/web/modules/peerconnection/media_stream_video_webrtc_sink.h"
 
-#include "base/test/task_environment.h"
-#include "content/child/child_process.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/blink/public/platform/scheduler/test/renderer_scheduler_test_support.h"
 #include "third_party/blink/public/web/modules/mediastream/mock_media_stream_registry.h"
 #include "third_party/blink/public/web/modules/mediastream/video_track_adapter_settings.h"
 #include "third_party/blink/public/web/modules/peerconnection/mock_peer_connection_dependency_factory.h"
+#include "third_party/blink/renderer/platform/testing/io_task_runner_testing_platform_support.h"
 
-namespace content {
-namespace {
+namespace blink {
 
 class MediaStreamVideoWebRtcSinkTest : public ::testing::Test {
  public:
-  MediaStreamVideoWebRtcSinkTest()
-      : task_environment_(base::test::TaskEnvironment::MainThreadType::UI) {}
-
   void SetVideoTrack() {
     registry_.Init();
     registry_.AddVideoTrack("test video track");
@@ -47,12 +42,9 @@ class MediaStreamVideoWebRtcSinkTest : public ::testing::Test {
   blink::MockPeerConnectionDependencyFactory dependency_factory_;
 
  private:
+  ScopedTestingPlatformSupport<IOTaskRunnerTestingPlatformSupport> platform_;
+
   blink::MockMediaStreamRegistry registry_;
-  // A ChildProcess is needed to fool the Tracks and Sources into believing they
-  // are on the right threads. A TaskEnvironment must be instantiated
-  // before ChildProcess to prevent it from leaking a ThreadPool.
-  base::test::TaskEnvironment task_environment_;
-  const ChildProcess child_process_;
 };
 
 TEST_F(MediaStreamVideoWebRtcSinkTest, NoiseReductionDefaultsToNotSet) {
@@ -64,5 +56,4 @@ TEST_F(MediaStreamVideoWebRtcSinkTest, NoiseReductionDefaultsToNotSet) {
   EXPECT_FALSE(my_sink.SourceNeedsDenoisingForTesting());
 }
 
-}  // namespace
-}  // namespace content
+}  // namespace blink