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

net/quic/core/frames/quic_path_close_frame.h

Index: net/quic/core/frames/quic_path_close_frame.h
diff --git a/net/quic/core/frames/quic_path_close_frame.h b/net/quic/core/frames/quic_path_close_frame.h
new file mode 100644
index 0000000000000000000000000000000000000000..0af136289047bb1715ba9680761fb92abdef820f
--- /dev/null
+++ b/net/quic/core/frames/quic_path_close_frame.h
@@ -0,0 +1,32 @@
+// 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_PATH_CLOSE_FRAME_H_
+#define NET_QUIC_CORE_FRAMES_QUIC_PATH_CLOSE_FRAME_H_
+
+#include "net/base/net_export.h"
+#include "net/quic/core/quic_types.h"
+
+namespace net {
+
+// The PATH_CLOSE frame is used to explicitly close a path. Both endpoints can
+// send a PATH_CLOSE frame to initiate a path termination. A path is considered
+// to be closed either a PATH_CLOSE frame is sent or received. An endpoint drops
+// receive side of a closed path, and packets with retransmittable frames on a
+// closed path are marked as retransmissions which will be transmitted on other
+// paths.
+struct NET_EXPORT_PRIVATE QuicPathCloseFrame {
+  QuicPathCloseFrame() {}
+  explicit QuicPathCloseFrame(QuicPathId path_id);
+
+  friend NET_EXPORT_PRIVATE std::ostream& operator<<(
+      std::ostream& os,
+      const QuicPathCloseFrame& p);
+
+  QuicPathId path_id;
+};
+
+}  // namespace net
+
+#endif  // NET_QUIC_CORE_QUIC_FRAMES_H_