Move webrtc_media_stream_track_adapter_unittest.cc to Blink

It is now possible after mock_peer_connection_dependency_factory.h|cc
move [1].

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

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

Change-Id: I76ea8c3477467f5b4956af64cc4b76cc28c20775
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816792
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@{#704731}

content/test/BUILD.gn

@@ -1957,7 +1957,6 @@ test("content_unittests") {
     "../renderer/media/webrtc/transceiver_state_surfacer_unittest.cc",
     "../renderer/media/webrtc/webrtc_audio_renderer_unittest.cc",
     "../renderer/media/webrtc/webrtc_media_stream_track_adapter_map_unittest.cc",
-    "../renderer/media/webrtc/webrtc_media_stream_track_adapter_unittest.cc",
     "../renderer/media/webrtc/webrtc_set_description_observer_unittest.cc",
     "../renderer/peripheral_content_heuristic_unittest.cc",
     "../renderer/queue_message_swap_promise_unittest.cc",

third_party/blink/renderer/modules/BUILD.gn

@@ -389,6 +389,7 @@ jumbo_source_set("unit_tests") {
     "peerconnection/rtc_quic_transport_test.cc",
     "peerconnection/rtc_quic_transport_test.h",
     "peerconnection/rtc_sctp_transport_test.cc",
+    "peerconnection/webrtc_media_stream_track_adapter_test.cc",
     "picture_in_picture/picture_in_picture_controller_test.cc",
     "presentation/mock_presentation_service.h",
     "presentation/presentation_availability_state_test.cc",

third_party/blink/renderer/modules/peerconnection/DEPS

@@ -21,7 +21,7 @@ include_rules = [
 ]
 
 specific_include_rules = {
-    "rtc_data_channel_test\.cc" : [
+    ".*test\.cc" : [
         "+base/run_loop.h",
     ],
 }

content/renderer/media/webrtc/webrtc_media_stream_track_adapter_unittest.cc → third_party/blink/renderer/modules/peerconnection/webrtc_media_stream_track_adapter_test.cc

@@ -7,12 +7,10 @@
 #include <memory>
 
 #include "base/bind.h"
-#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_refptr.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/synchronization/waitable_event.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/modules/mediastream/media_stream_audio_source.h"
 #include "third_party/blink/public/platform/scheduler/test/renderer_scheduler_test_support.h"
@@ -23,8 +21,9 @@
 #include "third_party/blink/public/web/modules/mediastream/mock_media_stream_video_source.h"
 #include "third_party/blink/public/web/modules/peerconnection/mock_peer_connection_dependency_factory.h"
 #include "third_party/blink/public/web/web_heap.h"
+#include "third_party/blink/renderer/platform/testing/io_task_runner_testing_platform_support.h"
 
-namespace content {
+namespace blink {
 
 class WebRtcMediaStreamTrackAdapterTest : public ::testing::Test {
  public:
@@ -114,10 +113,7 @@ class WebRtcMediaStreamTrackAdapterTest : public ::testing::Test {
   }
 
  protected:
-  // The TaskEnvironment prevents the ChildProcess from leaking a
-  // ThreadPool.
-  base::test::TaskEnvironment task_environment_;
-  ChildProcess child_process_;
+  ScopedTestingPlatformSupport<IOTaskRunnerTestingPlatformSupport> platform_;
 
   std::unique_ptr<blink::MockPeerConnectionDependencyFactory>
       dependency_factory_;
@@ -272,4 +268,4 @@ TEST_F(WebRtcMediaStreamTrackAdapterTest, LastReferenceOnSignalingThread) {
   RunMessageLoopsUntilIdle();
 }
 
-}  // namespace content
+}  // namespace blink