relnote: add new unused functions for client side of QUIC server push.

net/quic/spdy_utils.cc

Index: net/quic/spdy_utils.cc
diff --git a/net/quic/spdy_utils.cc b/net/quic/spdy_utils.cc
index 3ff15270a162065fb7437fef2f2e6fd5de13766c..6f2d29f423a2cb88478b994258980044b7c26216 100644
--- a/net/quic/spdy_utils.cc
+++ b/net/quic/spdy_utils.cc
@@ -13,6 +13,7 @@
 #include "net/spdy/spdy_frame_builder.h"
 #include "net/spdy/spdy_framer.h"
 #include "net/spdy/spdy_protocol.h"
+#include "url/gurl.h"
 
 using std::string;
 using std::vector;
@@ -105,4 +106,31 @@ bool SpdyUtils::ParseTrailers(const char* data,
   return true;
 }
 
+// static
+string SpdyUtils::GetUrlFromHeaderBlock(const SpdyHeaderBlock& headers) {
+  SpdyHeaderBlock::const_iterator it = headers.find(":scheme");
+  if (it == headers.end())
+    return "";
+  std::string url = it->second.as_string();
+
+  url.append("://");
+
+  it = headers.find(":authority");
+  if (it == headers.end())
+    return "";
+  url.append(it->second.as_string());
+
+  it = headers.find(":path");
+  if (it == headers.end())
+    return "";
+  url.append(it->second.as_string());
+  return url;
+}
+
+// static
+bool SpdyUtils::UrlIsValid(const SpdyHeaderBlock& headers) {
+  string url(GetUrlFromHeaderBlock(headers));
+  return url != "" && GURL(url).is_valid();
+}
+
 }  // namespace net