Added a flow control blocked notification message.

This message indicates to the recipient that the sender believes that it
is flow-control blocked but otherwise ready to send data. The BLOCKED frame
is purely advisory and optional.

This lands server change 56838900 by ygi.

R=rch@chromium.org

Review URL: https://codereview.chromium.org/139573002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245274 0039d316-1c4b-4281-b951-d872f2087c98

net/spdy/spdy_framer.cc

@@ -1882,6 +1882,11 @@ SpdySerializedFrame* SpdyFramer::SerializeSettings(
   return builder.take();
 }
 
+SpdyFrame* SpdyFramer::CreateBlocked(SpdyStreamId stream_id) {
+  SpdyBlockedIR blocked_ir(stream_id);
+  return SerializeBlocked(blocked_ir);
+}
+
 SpdyFrame* SpdyFramer::SerializeBlocked(const SpdyBlockedIR& blocked) const {
   DCHECK_LE(4, protocol_version());
   SpdyFrameBuilder builder(GetBlockedSize());

net/spdy/spdy_framer.h

@@ -440,10 +440,11 @@ class NET_EXPORT_PRIVATE SpdyFramer {
   SpdySerializedFrame* SerializeCredential(
       const SpdyCredentialIR& credential) const;
 
-  // Serializes a BLOCKED frame. The BLOCKED frame is used to indicate to the
-  // remote endpoint that this endpoint believes itself to be flow-control
-  // blocked but otherwise ready to send data. The BLOCKED frame is purely
-  // advisory and optional.
+  // Creates and serializes a BLOCKED frame. The BLOCKED frame is used to
+  // indicate to the remote endpoint that this endpoint believes itself to be
+  // flow-control blocked but otherwise ready to send data. The BLOCKED frame
+  // is purely advisory and optional.
+  SpdyFrame* CreateBlocked(SpdyStreamId stream_id);
   SpdySerializedFrame* SerializeBlocked(const SpdyBlockedIR& blocked) const;
 
   // Creates and serializes a PUSH_PROMISE frame. The PUSH_PROMISE frame is used

net/spdy/spdy_framer_test.cc

@@ -3031,7 +3031,25 @@ TEST_P(SpdyFramerTest, SerializeBlocked) {
   SpdyBlockedIR blocked_ir(0);
   scoped_ptr<SpdySerializedFrame> frame(framer.SerializeFrame(blocked_ir));
   CompareFrame(kDescription, *frame, kFrameData, arraysize(kFrameData));
+}
+
+TEST_P(SpdyFramerTest, CreateBlocked) {
+  if (spdy_version_ < SPDY4) {
+    return;
+  }
+
+  SpdyFramer framer(spdy_version_);
+
+  const char kDescription[] = "BLOCKED frame";
+  const SpdyStreamId kStreamId = 3;
+
+  scoped_ptr<SpdySerializedFrame> frame_serialized(
+                                    framer.CreateBlocked(kStreamId));
+  SpdyBlockedIR blocked_ir(kStreamId);
+  scoped_ptr<SpdySerializedFrame> frame_created(
+                                    framer.SerializeFrame(blocked_ir));
 
+  CompareFrames(kDescription, *frame_serialized, *frame_created);
 }
 
 TEST_P(SpdyFramerTest, CreatePushPromiseUncompressed) {