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

webrtc/tools/header_usage

+#! /bin/bash
+
+# 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).
+#
+# Headers close to the top of the list are candidates for removal.
+
+git ls-files '*.h' | while read header ; do

[kjellander_webrtc, 2016/06/13 12:49:52]

We do have two .hpp files. Might want to rename them :)
$ git ls-files '*.hpp'
webrtc/system_wrappers/source/spreadsortlib/constants.hpp
webrtc/system_wrappers/source/spreadsortlib/spreadsort.hpp

[nisse-webrtc, 2016/06/14 09:38:47]

Added '*.hpp' to the ls-files argument list.

+  name="$(basename "$header")"

[kjellander_webrtc, 2016/06/13 12:49:52]

Prefer curly brace quoting of variables:
https://engdoc.corp.google.com/eng/doc/shell.xml?showone=Variable_expansion&c...

[nisse-webrtc, 2016/06/14 09:38:47]

Done.

+  count="$(git grep -l -F  "$name" | wc -l)"
+  echo "$count" "$header"
+done | sort -n