Roll DomDistillerJs (and make updater generate BUG=)

third_party/dom_distiller_js/update_domdistiller_js.sh

 #!/bin/bash
 #
 # Copyright 2014 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.
 #
 
 # Clones the dom-distiller repo, compiles and extracts its javascript Then
 # copies that js into the Chromium tree.
 # This script should be run from the src/ directory and requires that ant is
 # installed.
 
 (
   dom_distiller_js_path=third_party/dom_distiller_js
   dom_distiller_js_package=$dom_distiller_js_path/package
   readme_chromium=$dom_distiller_js_path/README.chromium
   tmpdir=/tmp/domdistiller-$$
-  changes=/tmp/domdistiller.changes
+  changes=$tmpdir/domdistiller.changes
+  bugs=$tmpdir/domdistiller.bugs
   curr_gitsha=$(grep 'Version:' $readme_chromium | awk '{print $2}')
 
   rm -rf $tmpdir
   mkdir $tmpdir
 
   pushd $tmpdir
   git clone https://code.google.com/p/dom-distiller/ .
+
   new_gitsha=$(git rev-parse --short=10 HEAD)
   git log --oneline ${curr_gitsha}.. > $changes
+
+  echo -n BUG= > $bugs
+
+  # This extracts BUG= lines from the log, extracts the numbers part, removes
+  # whitespace and deletes empty lines. Then, split on ',', sort, uniquify and
+  # rejoin. Finally, remove the trailing ',' and concat to $bugs.
+  git log \
+    | grep BUG= \
+    | sed -e 's/.*BUG=\(.*\)/\1/' -e 's/\s*//g' -e '/^$/d' \
+    | tr ',' '\n' \
+    | sort \
+    | uniq \
+    | tr '\n' ',' \
+    | head --bytes=-1 \
+    >> $bugs
+
+  echo >> $bugs  # add a newline
+
   ant package
   popd
 
   rm -rf $dom_distiller_js_package
   mkdir $dom_distiller_js_package
   cp -rf $tmpdir/out/package/* $dom_distiller_js_package
   cp $tmpdir/LICENSE $dom_distiller_js_path/
   sed -i "s/Version: [0-9a-f]*/Version: $new_gitsha/" $readme_chromium
 
+  echo
+  echo
+  echo "---Generated commit message---"
+  echo
   echo "Picked up changes:"
   cat $changes
+  echo
+  cat $bugs
 
   # Run checklicenses.py on the pulled files, but only print the output on
   # failures.
   tools/checklicenses/checklicenses.py $dom_distiller_js_path > $tmpdir/checklicenses.out || cat $tmpdir/checklicenses.out
 
   rm -rf $tmpdir
-  rm $changes
 )