Use RtcpPacket to send SLI in RtcpSender

webrtc/modules/rtp_rtcp/test/testAPI/test_api_rtcp.cc

Index: webrtc/modules/rtp_rtcp/test/testAPI/test_api_rtcp.cc
diff --git a/webrtc/modules/rtp_rtcp/test/testAPI/test_api_rtcp.cc b/webrtc/modules/rtp_rtcp/test/testAPI/test_api_rtcp.cc
index 741b7ac0bd95fadc79e98159f3f95013a49aceb2..4fc89a9a84a7b454118a6938487e175a28a1e740 100644
--- a/webrtc/modules/rtp_rtcp/test/testAPI/test_api_rtcp.cc
+++ b/webrtc/modules/rtp_rtcp/test/testAPI/test_api_rtcp.cc
@@ -23,6 +23,7 @@
 using namespace webrtc;
 
 const uint64_t kTestPictureId = 12345678;
+const uint8_t kSliPictureId = 156;
 
 class RtcpCallback : public RtcpIntraFrameObserver {
  public:
@@ -38,7 +39,7 @@ class RtcpCallback : public RtcpIntraFrameObserver {
   };
   virtual void OnReceivedSLI(uint32_t ssrc,
                              uint8_t pictureId) {
-    EXPECT_EQ(28, pictureId);
+    EXPECT_EQ(kSliPictureId & 0x3f, pictureId);
   };
   virtual void OnReceivedRPSI(uint32_t ssrc,
                               uint64_t pictureId) {
@@ -204,7 +205,7 @@ class RtpRtcpRtcpTest : public ::testing::Test {
 
 TEST_F(RtpRtcpRtcpTest, RTCP_PLI_RPSI) {
   EXPECT_EQ(0, module1->SendRTCPReferencePictureSelection(kTestPictureId));
-  EXPECT_EQ(0, module1->SendRTCPSliceLossIndication(156));
+  EXPECT_EQ(0, module1->SendRTCPSliceLossIndication(kSliPictureId));
 }
 
 TEST_F(RtpRtcpRtcpTest, RTCP_CNAME) {