New misc scripts, header_usage.sh and author_line_count.sh.

webrtc/tools/author_line_count.sh

+#!/bin/bash
+
+# Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+# This script counts net line count contributions by author. Besides
+# amusement, the value of these stats are of course questionable.
+
+git log "$@" --pretty=format:%ae --shortstat \
+  | sed '/^ /s/,/\n/g' \
+  | gawk '
+/^[^ ]/ {
+  /* Some author "email addresses" have a trailing @svn-id, strip that out. */
+  author = gensub(/^([^@]*@[^@]*).*/, "\\1", "", $1);
+}
+/^ .*insertion/ { total[author] += $1 }
+/^ .*deletion/ { total[author] -= $1 }
+END { for (author in total) {
+        print total[author], author
+      }
+}
+' \
+  | sort -nr