Move webkit-patch bash completion to tools/bash-completion.

tools/bash-completion

 # Copyright (c) 2012 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.
 
 # Flag completion rule for bash.
 # To load in your shell, "source path/to/this/file".
 
 # Usage examples
 # ==============
 #
 # Browser command line switches:
 # $ out/gn/chrome --site-per-pro<tab>
 # $ google-chrome --site-per-pro<tab>
 #
 # Test switches (i.e. --gtest_* and --test-launcher-* switches):
 # $ out/gn/unit_tests --gtest_filt<tab>
 # $ out/gn/unit_tests --test-launcher-j<tab>
 #
 # Layout test switches:
 # $ third_party/WebKit/Tools/Scripts/run-webkit-tests --additional-driver-f<tab>
 # $ .../run-webkit-tests --additional-driver-flag=--site-per-pro<tab>
+#
+# Blink webkit-patch sub-commands:
+# $ third_party/WebKit/Tools/Scripts/webkit-patch reb<tab>
 
-chrome_source=$(cd $(dirname $BASH_SOURCE)/.. && pwd)
+if [ -n "$BASH_SOURCE" ]; then
+    # The $BASH_SOURCE variable returns path of current script in bash.
+    chrome_source=$(cd $(dirname $BASH_SOURCE)/.. && pwd)
+else
+    # This is here for other similar shells, e.g. zsh.
+    chrome_source=$(cd $(dirname $0)/.. && pwd)
+fi
 
 _chrome_flag() {
     local cur targets
     cur="${COMP_WORDS[COMP_CWORD]}"
     targets=$(cd $chrome_source; \
         git ls-files '*switches*' | \
         xargs sed -ne 's/^[^/]*"\([^" /]\{1,\}\)".*/--\1/p')
     COMPREPLY=($(compgen -W "$targets" -- "$cur"))
     return 0
 }
@@ skipping 30 matching lines @@
     fi
 
     # Complete run-webkit-tests switches.
     webkitpy_dir="$chrome_source/third_party/WebKit/Tools/Scripts/webkitpy"
     targets=$(sed -ne 's/^[[:space:]]*"\(--[a-z-]\+\)",[[:space:]]*$/\1/p' \
         "$webkitpy_dir/layout_tests/run_webkit_tests.py")
     COMPREPLY=($(compgen -W "$targets" -- "$cur"))
     return 0
 }
 
+_webkit_patch_flag() {
+    local cur targets webkit_scripts_dir
+    cur="${COMP_WORDS[COMP_CWORD]}"
+    webkit_scripts_dir=$chrome_source/third_party/WebKit/Tools/Scripts
+    targets=$($webkit_scripts_dir/webkit-patch help | grep '^   [a-z]' | \
+        awk '{ print $1 }')
+    COMPREPLY=($(compgen -W "$targets" -- "$cur"))
+    return 0
+}
+
 complete -F _chrome_flag google-chrome
 complete -F _chrome_flag chrome
 if [ $(uname) = "Darwin" ]
 then
   complete -F _chrome_flag Chromium
 fi
 
 for gtest_test_executable in $(
   cd $chrome_source;
   git ls-files '*/BUILD.gn' | xargs sed -ne 's/^.*test("\([^"]\+\)").*$/\1/p'
 ); do
   complete -F _gtest_flag $gtest_test_executable
 done
 
 complete -F _layout_test_flag run-webkit-tests
+complete -F _webkit_patch_flag webkit-patch