Split up quic_frames.{h,cc} into files for each frame type.

net/quic/core/frames/quic_window_update_frame.h

Index: net/quic/core/frames/quic_window_update_frame.h
diff --git a/net/quic/core/frames/quic_window_update_frame.h b/net/quic/core/frames/quic_window_update_frame.h
new file mode 100644
index 0000000000000000000000000000000000000000..fa9b9467142d136528dfca8c974e55f33640f5aa
--- /dev/null
+++ b/net/quic/core/frames/quic_window_update_frame.h
@@ -0,0 +1,36 @@
+// Copyright (c) 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef NET_QUIC_CORE_FRAMES_QUIC_WINDOW_UPDATE_FRAME_H_
+#define NET_QUIC_CORE_FRAMES_QUIC_WINDOW_UPDATE_FRAME_H_
+
+#include "net/quic/core/quic_types.h"
+
+namespace net {
+
+// Flow control updates per-stream and at the connection levoel.
+// Based on SPDY's WINDOW_UPDATE frame, but uses an absolute byte offset rather
+// than a window delta.
+// TODO(rjshade): A possible future optimization is to make stream_id and
+//                byte_offset variable length, similar to stream frames.
+struct NET_EXPORT_PRIVATE QuicWindowUpdateFrame {
+  QuicWindowUpdateFrame() {}
+  QuicWindowUpdateFrame(QuicStreamId stream_id, QuicStreamOffset byte_offset);
+
+  friend NET_EXPORT_PRIVATE std::ostream& operator<<(
+      std::ostream& os,
+      const QuicWindowUpdateFrame& w);
+
+  // The stream this frame applies to.  0 is a special case meaning the overall
+  // connection rather than a specific stream.
+  QuicStreamId stream_id;
+
+  // Byte offset in the stream or connection. The receiver of this frame must
+  // not send data which would result in this offset being exceeded.
+  QuicStreamOffset byte_offset;
+};
+
+}  // namespace net
+
+#endif  // NET_QUIC_CORE_FRAMES_QUIC_WINDOW_UPDATE_FRAME_H_