Add Cast PLI support on sender side.

media/cast/net/rtcp/rtcp_unittest.cc

Index: media/cast/net/rtcp/rtcp_unittest.cc
diff --git a/media/cast/net/rtcp/rtcp_unittest.cc b/media/cast/net/rtcp/rtcp_unittest.cc
index f26f935127199e3e30fc240f1ac30a4337e0dc9d..fa871944a97f7bf62e44c401ca2a8ad164efc216 100644
--- a/media/cast/net/rtcp/rtcp_unittest.cc
+++ b/media/cast/net/rtcp/rtcp_unittest.cc
@@ -87,6 +87,7 @@ class RtcpTest : public ::testing::Test {
             base::Bind(&RtcpTest::OnMeasuredRoundTripTime,
                        base::Unretained(this)),
             base::Bind(&RtcpTest::OnReceivedLogs, base::Unretained(this)),
+            base::Bind(&RtcpTest::OnReceivedPli, base::Unretained(this)),
             sender_clock_.get(),
             &sender_to_receiver_,
             kSenderSsrc,
@@ -94,7 +95,8 @@ class RtcpTest : public ::testing::Test {
         rtcp_for_receiver_(receiver_clock_.get(),
                            &receiver_to_sender_,
                            kReceiverSsrc,
-                           kSenderSsrc) {
+                           kSenderSsrc),
+        received_pli_(false) {
     sender_clock_->Advance(base::TimeTicks::Now() - base::TimeTicks());
     receiver_clock_->SetSkew(
         1.0,  // No skew.
@@ -133,6 +135,8 @@ class RtcpTest : public ::testing::Test {
     }
   }
 
+  void OnReceivedPli() { received_pli_ = true; }
+
   scoped_ptr<base::SimpleTestTickClock> sender_clock_;
   scoped_ptr<test::SkewedTickClock> receiver_clock_;
   FakeRtcpTransport sender_to_receiver_;
@@ -143,6 +147,7 @@ class RtcpTest : public ::testing::Test {
   base::TimeDelta current_round_trip_time_;
   RtcpCastMessage last_cast_message_;
   RtcpReceiverLogMessage last_logs_;
+  bool received_pli_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RtcpTest);
@@ -238,6 +243,15 @@ TEST_F(RtcpTest, ReportCastFeedback) {
                  last_cast_message_.missing_frames_and_packets.begin()));
 }
 
+TEST_F(RtcpTest, ReportPli) {
+  RtcpCastMessage cast_message(kSenderSsrc);
+  cast_message.picture_loss_indicator = true;
+  rtcp_for_receiver_.SendRtcpReport(
+      CreateRtcpTimeData(base::TimeTicks()), &cast_message,
+      base::TimeDelta::FromMilliseconds(kTargetDelayMs), nullptr, nullptr);
+  EXPECT_TRUE(received_pli_);
+}
+
 TEST_F(RtcpTest, DropLateRtcpPacket) {
   RtcpCastMessage cast_message(kSenderSsrc);
   cast_message.ack_frame_id = 1;