diff --git a/webrtc/video/loopback.cc b/webrtc/video/loopback.cc
index 4d3393e70..4b49c31e1 100644
--- a/webrtc/video/loopback.cc
+++ b/webrtc/video/loopback.cc
@@ -22,13 +22,18 @@
 #include "webrtc/test/direct_transport.h"
 #include "webrtc/test/encoder_settings.h"
 #include "webrtc/test/fake_encoder.h"
+#include "webrtc/test/field_trial.h"
 #include "webrtc/test/run_loop.h"
 #include "webrtc/test/run_test.h"
+#include "webrtc/test/testsupport/trace_to_stderr.h"
 #include "webrtc/test/video_capturer.h"
 #include "webrtc/test/video_renderer.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
+
+static const int kAbsSendTimeExtensionId = 7;
+
 namespace flags {
 
 DEFINE_int32(width, 640, "Video width.");
@@ -82,6 +87,16 @@ DEFINE_int32(std_propagation_delay_ms,
 int StdPropagationDelayMs() {
   return static_cast<int>(FLAGS_std_propagation_delay_ms);
 }
+
+DEFINE_bool(logs, false, "print logs to stderr");
+
+DEFINE_string(
+    force_fieldtrials,
+    "",
+    "Field trials control experimental feature code which can be forced. "
+    "E.g. running with --force_fieldtrials=WebRTC-FooFeature/Enable/"
+    " will assign the group Enable to field trial WebRTC-FooFeature. Multiple "
+    "trials are separated by \"/\"");
 }  // namespace flags
 
 static const uint32_t kSendSsrc = 0x654321;
@@ -91,6 +106,10 @@ static const uint32_t kReceiverLocalSsrc = 0x123456;
 static const uint8_t kRtxPayloadType = 96;
 
 void Loopback() {
+  scoped_ptr<test::TraceToStderr> trace_to_stderr_;
+  if (webrtc::flags::FLAGS_logs)
+    trace_to_stderr_.reset(new test::TraceToStderr);
+
   scoped_ptr<test::VideoRenderer> local_preview(test::VideoRenderer::Create(
       "Local Preview", flags::Width(), flags::Height()));
   scoped_ptr<test::VideoRenderer> loopback_video(test::VideoRenderer::Create(
@@ -116,6 +135,8 @@ void Loopback() {
   send_config.rtp.rtx.ssrcs.push_back(kSendRtxSsrc);
   send_config.rtp.rtx.payload_type = kRtxPayloadType;
   send_config.rtp.nack.rtp_history_ms = 1000;
+  send_config.rtp.extensions.push_back(
+      RtpExtension(RtpExtension::kAbsSendTime, kAbsSendTimeExtensionId));
 
   send_config.local_renderer = local_preview.get();
   scoped_ptr<VideoEncoder> encoder;
@@ -158,6 +179,8 @@ void Loopback() {
   receive_config.rtp.nack.rtp_history_ms = 1000;
   receive_config.rtp.rtx[kRtxPayloadType].ssrc = kSendRtxSsrc;
   receive_config.rtp.rtx[kRtxPayloadType].payload_type = kRtxPayloadType;
+  receive_config.rtp.extensions.push_back(
+      RtpExtension(RtpExtension::kAbsSendTime, kAbsSendTimeExtensionId));
   receive_config.renderer = loopback_video.get();
   VideoReceiveStream::Decoder decoder =
       test::CreateMatchingDecoder(send_config.encoder_settings);
@@ -188,7 +211,8 @@ void Loopback() {
 int main(int argc, char* argv[]) {
   ::testing::InitGoogleTest(&argc, argv);
   google::ParseCommandLineFlags(&argc, &argv, true);
-
+  webrtc::test::InitFieldTrialsFromString(
+      webrtc::flags::FLAGS_force_fieldtrials);
   webrtc::test::RunTest(webrtc::Loopback);
   return 0;
 }
diff --git a/webrtc/webrtc_tests.gypi b/webrtc/webrtc_tests.gypi
index 33e509fa0..dc17e707e 100644
--- a/webrtc/webrtc_tests.gypi
+++ b/webrtc/webrtc_tests.gypi
@@ -59,6 +59,7 @@
         '<(webrtc_root)/modules/modules.gyp:video_capture_module_internal_impl',
         '<(webrtc_root)/modules/modules.gyp:video_render_module_impl',
         '<(webrtc_root)/system_wrappers/source/system_wrappers.gyp:system_wrappers_default',
+        'test/test.gyp:test_main',
         'webrtc',
       ],
     },