Add explicit copy constructors to RTPHeader and RTPHeaderExtension

webrtc/common_types.h

Index: webrtc/common_types.h
diff --git a/webrtc/common_types.h b/webrtc/common_types.h
index 49b42ac37656091140a5d2a1476fd9a20fac4b13..e5bd9a8741808bade2ca7bd50f3cb52c362fa413 100644
--- a/webrtc/common_types.h
+++ b/webrtc/common_types.h
@@ -792,6 +792,8 @@ typedef StringRtpHeaderExtension Mid;
 
 struct RTPHeaderExtension {
   RTPHeaderExtension();
+  RTPHeaderExtension(const RTPHeaderExtension& other);
+  RTPHeaderExtension& operator=(const RTPHeaderExtension& other);
 
   bool hasTransmissionTimeOffset;
   int32_t transmissionTimeOffset;
@@ -835,6 +837,8 @@ struct RTPHeaderExtension {
 
 struct RTPHeader {
   RTPHeader();
+  RTPHeader(const RTPHeader& other);
+  RTPHeader& operator=(const RTPHeader& other);
 
   bool markerBit;
   uint8_t payloadType;