SpdyFramer hooks for parsing and handling PRIORITY frames.

net/spdy/spdy_framer.h

Index: net/spdy/spdy_framer.h
diff --git a/net/spdy/spdy_framer.h b/net/spdy/spdy_framer.h
index 218423424fba612648742a4721f3d892e8ecaf40..7ade08012e05d3573d6266281da86669c494ce35 100644
--- a/net/spdy/spdy_framer.h
+++ b/net/spdy/spdy_framer.h
@@ -284,6 +284,12 @@ class NET_EXPORT_PRIVATE SpdyFramerVisitorInterface {
                         base::StringPiece protocol_id,
                         base::StringPiece host,
                         base::StringPiece origin) {}
+
+  // Called when a PRIORITY frame is received.
+  virtual void OnPriority(SpdyStreamId stream_id,
+                          SpdyStreamId parent_stream_id,
+                          uint8 weight,
+                          bool exclusive) {};
 };
 
 // Optionally, and in addition to SpdyFramerVisitorInterface, a class supporting
@@ -478,6 +484,10 @@ class NET_EXPORT_PRIVATE SpdyFramer {
   // availability of an alternative service to the client.
   SpdySerializedFrame* SerializeAltSvc(const SpdyAltSvcIR& altsvc);
 
+  // Serializes a PRIORITY frame. The PRIORITY frame advises a change in
+  // the relative priority of the given stream.
+  SpdySerializedFrame* SerializePriority(const SpdyPriorityIR& priority);
+
   // Serialize a frame of unknown type.
   SpdySerializedFrame* SerializeFrame(const SpdyFrameIR& frame);