Add Cast PLI support on sender side.

media/cast/net/rtcp/rtcp_utility_unittest.cc

Index: media/cast/net/rtcp/rtcp_utility_unittest.cc
diff --git a/media/cast/net/rtcp/rtcp_utility_unittest.cc b/media/cast/net/rtcp/rtcp_utility_unittest.cc
index 4eed746297e42b9e5fba1612b6fcacb64d87d2ab..23583977db6210fe97c8ecc4707855072752fdbd 100644
--- a/media/cast/net/rtcp/rtcp_utility_unittest.cc
+++ b/media/cast/net/rtcp/rtcp_utility_unittest.cc
@@ -341,6 +341,28 @@ TEST_F(RtcpParserTest, ExtendedCastFeedbackDoesNotBreakParsing) {
   ExpectCastFeedback(parser);
 }
 
+TEST_F(RtcpParserTest, InjectReceiverReportPli) {
+  // Expect to be ignored since the sender ssrc does not match.
+  TestRtcpPacketBuilder builder1;
+  builder1.AddPli(kUnknownSsrc, kSourceSsrc);
+  RtcpParser parser1(kSourceSsrc, kSenderSsrc);
+  EXPECT_TRUE(parser1.Parse(builder1.Reader()));
+  EXPECT_FALSE(parser1.has_received_pli());
+
+  // Expect to be ignored since the receiver ssrc does not match.
+  TestRtcpPacketBuilder builder2;
+  builder2.AddPli(kSenderSsrc, kUnknownSsrc);
+  RtcpParser parser2(kSourceSsrc, kSenderSsrc);
+  EXPECT_TRUE(parser2.Parse(builder2.Reader()));
+  EXPECT_FALSE(parser2.has_received_pli());
+
+  TestRtcpPacketBuilder builder3;
+  builder3.AddPli(kSenderSsrc, kSourceSsrc);
+  RtcpParser parser3(kSourceSsrc, kSenderSsrc);
+  EXPECT_TRUE(parser3.Parse(builder3.Reader()));
+  EXPECT_TRUE(parser3.has_received_pli());
+}
+
 TEST_F(RtcpParserTest, InjectReceiverReportWithReceiverLogVerificationBase) {
   static const uint32_t kTimeBaseMs = 12345678;
   static const uint32_t kTimeDelayMs = 10;