Reland of rewrite frame generator capturer to use TaskQueue instead of EventTimeWrapper

webrtc/call/call_perf_tests.cc

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 458 matching lines @@
   TestCaptureNtpTime(net_config, kThresholdMs, kStartTimeMs, kRunTimeMs);
 }
 
 TEST_F(CallPerfTest, ReceivesCpuOveruseAndUnderuse) {
   class LoadObserver : public test::SendTest,
                        public test::FrameGeneratorCapturer::SinkWantsObserver {
    public:
     LoadObserver()
         : SendTest(kLongTimeoutMs),
           expect_lower_resolution_wants_(true),
-          encoder_(Clock::GetRealTimeClock(), 35 /* delay_ms */) {}
+          encoder_(Clock::GetRealTimeClock(), 40 /* delay_ms */) {}
 
     void OnFrameGeneratorCapturerCreated(
         test::FrameGeneratorCapturer* frame_generator_capturer) override {
       frame_generator_capturer->SetSinkWantsObserver(this);
       // Set a high initial resolution to be sure that we can scale down.
       frame_generator_capturer->ChangeResolution(1920, 1080);
     }
 
     // OnSinkWantsChanged is called when FrameGeneratorCapturer::AddOrUpdateSink
     // is called.
@@ skipping 246 matching lines @@
     uint32_t last_set_bitrate_kbps_;
     VideoSendStream* send_stream_;
     test::FrameGeneratorCapturer* frame_generator_;
     VideoEncoderConfig encoder_config_;
   } test;
 
   RunBaseTest(&test);
 }
 
 }  // namespace webrtc