Add handling + parsing for HTTP/2 ALTSVC frame.

net/spdy/spdy_protocol.cc

Index: net/spdy/spdy_protocol.cc
diff --git a/net/spdy/spdy_protocol.cc b/net/spdy/spdy_protocol.cc
index 78b4f392a69ccdbd40a02febc0beee4bd4562f7c..4945d85b038778e4e502ddec52cef2e62c9e2715 100644
--- a/net/spdy/spdy_protocol.cc
+++ b/net/spdy/spdy_protocol.cc
@@ -114,6 +114,8 @@ SpdyFrameType SpdyConstants::ParseFrameType(SpdyMajorVersion version,
         case 9:
           return CONTINUATION;
         case 10:
+          return ALTSVC;
+        case 11:
           return BLOCKED;
       }
       break;
@@ -171,8 +173,10 @@ int SpdyConstants::SerializeFrameType(SpdyMajorVersion version,
           return 8;
         case CONTINUATION:
           return 9;
-        case BLOCKED:
+        case ALTSVC:
           return 10;
+        case BLOCKED:
+          return 11;
         default:
           LOG(DFATAL) << "Serializing unhandled frame type " << frame_type;
           return -1;
@@ -788,4 +792,13 @@ void SpdyContinuationIR::Visit(SpdyFrameVisitor* visitor) const {
   return visitor->VisitContinuation(*this);
 }
 
+SpdyAltSvcIR::SpdyAltSvcIR(SpdyStreamId stream_id)
+    : SpdyFrameWithStreamIdIR(stream_id),
+      max_age_(0),
+      port_(0) {}
+
+void SpdyAltSvcIR::Visit(SpdyFrameVisitor* visitor) const {
+  return visitor->VisitAltSvc(*this);
+}
+
 }  // namespace net