Provision to start base::SimpleTestTickClock at initial ticks

media/cast/net/rtp/rtp_packetizer_unittest.cc

 // Copyright 2014 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 "media/cast/net/rtp/rtp_packetizer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 90 matching lines @@
   uint32_t expected_frame_id_;
   uint32_t expected_rtp_timestamp_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestRtpPacketTransport);
 };
 
 class RtpPacketizerTest : public ::testing::Test {
  protected:
   RtpPacketizerTest()
-      : task_runner_(new test::FakeSingleThreadTaskRunner(&testing_clock_)) {
+      : testing_clock_(base::TimeTicks()),
+        task_runner_(new test::FakeSingleThreadTaskRunner(&testing_clock_)) {
     config_.sequence_number = kSeqNum;
     config_.ssrc = kSsrc;
     config_.payload_type = kPayload;
     config_.max_payload_length = kMaxPacketLength;
     transport_.reset(new TestRtpPacketTransport(config_));
     pacer_.reset(new PacedSender(kTargetBurstSize, kMaxBurstSize,
                                  &testing_clock_, nullptr, transport_.get(),
                                  task_runner_));
     pacer_->RegisterVideoSsrc(config_.ssrc);
     rtp_packetizer_.reset(new RtpPacketizer(
@@ skipping 63 matching lines @@
   video_frame_.reference_time = testing_clock_.NowTicks();
   rtp_packetizer_->SendFrameAsPackets(video_frame_);
   RunTasks(33 + 1);
   EXPECT_EQ(expected_num_of_packets, rtp_packetizer_->send_packet_count());
   EXPECT_EQ(kFrameSize, rtp_packetizer_->send_octet_count());
   EXPECT_EQ(expected_num_of_packets, transport_->number_of_packets_received());
 }
 
 }  // namespace cast
 }  // namespace media