Removed SSRC knowledge from ViEEncoder.

webrtc/video/encoder_state_feedback.cc

Index: webrtc/video/encoder_state_feedback.cc
diff --git a/webrtc/video/encoder_state_feedback.cc b/webrtc/video/encoder_state_feedback.cc
index 52f51114fa8b5710b231908e542e15602fe95556..5c424d20591f217c2e24c6a030bfe6b88ba6f406 100644
--- a/webrtc/video/encoder_state_feedback.cc
+++ b/webrtc/video/encoder_state_feedback.cc
@@ -33,13 +33,22 @@ bool EncoderStateFeedback::HasSsrc(uint32_t ssrc) {
   return false;
 }
 
+int EncoderStateFeedback::GetStreamIndex(uint32_t ssrc) {
+  for (size_t i = 0; i < ssrcs_.size(); ++i) {
+    if (ssrcs_[i] == ssrc)
+      return i;
+  }
+  RTC_NOTREACHED() << "Unknown ssrc " << ssrc;
+  return 0;
+}
+
 void EncoderStateFeedback::OnReceivedIntraFrameRequest(uint32_t ssrc) {
   rtc::CritScope lock(&crit_);
   if (!HasSsrc(ssrc))
     return;
   RTC_DCHECK(vie_encoder_);
 
-  vie_encoder_->OnReceivedIntraFrameRequest(ssrc);
+  vie_encoder_->OnReceivedIntraFrameRequest(GetStreamIndex(ssrc));
 }
 
 void EncoderStateFeedback::OnReceivedSLI(uint32_t ssrc, uint8_t picture_id) {
@@ -48,7 +57,7 @@ void EncoderStateFeedback::OnReceivedSLI(uint32_t ssrc, uint8_t picture_id) {
     return;
   RTC_DCHECK(vie_encoder_);
 
-  vie_encoder_->OnReceivedSLI(ssrc, picture_id);
+  vie_encoder_->OnReceivedSLI(picture_id);
 }
 
 void EncoderStateFeedback::OnReceivedRPSI(uint32_t ssrc, uint64_t picture_id) {
@@ -57,7 +66,7 @@ void EncoderStateFeedback::OnReceivedRPSI(uint32_t ssrc, uint64_t picture_id) {
     return;
   RTC_DCHECK(vie_encoder_);
 
-  vie_encoder_->OnReceivedRPSI(ssrc, picture_id);
+  vie_encoder_->OnReceivedRPSI(picture_id);
 }
 
 // Sending SSRCs for this encoder should never change since they are configured