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

NOTRY=True
BUG=

Review-Url: https://codereview.webrtc.org/2061683002
Cr-Commit-Position: refs/heads/master@{#13148}

webrtc/tools/author_line_count.sh

@@ -0,0 +1,28 @@
+#!/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

webrtc/tools/header_usage.sh

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+#!/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 is run in a git repository. It lists all header files,
+# sorted by the number of other files where the file name of the file
+# occurs. It is intentionally not limited to only source files, and
+# there may be some false hits because we search only for the file
+# part (sans directory). It is quite slow.
+#
+# Headers close to the top of the list are candidates for removal.
+
+git ls-files '*.h' '*.hpp' | while read header ; do
+  name="$(basename "${header}")"
+  count="$(git grep -l -F  "${name}" | wc -l)"
+  echo "${count}" "${header}"
+done | sort -n