RtpPacket class introduced.

webrtc/modules/rtp_rtcp/source/rtp_header_extension.cc

Index: webrtc/modules/rtp_rtcp/source/rtp_header_extension.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_header_extension.cc b/webrtc/modules/rtp_rtcp/source/rtp_header_extension.cc
index 8605925785e6c79ef4a1135875ed87385dcd38a7..2c2a0a13566d5a5e2415f95c4fb99695c213afdf 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_header_extension.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_header_extension.cc
@@ -112,6 +112,14 @@ int32_t RtpHeaderExtensionMap::GetType(const uint8_t id,
   return 0;
 }
 
+RTPExtensionType RtpHeaderExtensionMap::GetType(uint8_t id) const {
+  auto it = extensionMap_.find(id);
+  if (it == extensionMap_.end()) {
+    return kInvalidType;
+  }
+  return it->second->type;
+}
+
 int32_t RtpHeaderExtensionMap::GetId(const RTPExtensionType type,
                                      uint8_t* id) const {
   assert(id);
@@ -129,6 +137,14 @@ int32_t RtpHeaderExtensionMap::GetId(const RTPExtensionType type,
   return -1;
 }
 
+uint8_t RtpHeaderExtensionMap::GetId(RTPExtensionType type) const {
+  for (auto kv : extensionMap_) {
+    if (kv.second->type == type)
+      return kv.first;
+  }
+  return kInvalidId;
+}
+
 size_t RtpHeaderExtensionMap::GetTotalLengthInBytes() const {
   // Get length for each extension block.
   size_t length = 0;