Added switch to disable generating cached_patches.dart file (Dartium only).

tools/dom/scripts/go.sh

 #!/usr/bin/env bash
 #
 
 set -x
 
 #   go.sh [systems]
 #
 # Convenience script to generate systems.  Do not call from build steps or tests
 # - call fremontcutbuilder and dartdomgenerator instead. Do not add 'real'
 # functionality here - change the python code instead.
 #
 # I find it essential to generate all the systems so I know if I am breaking
 # other systems.  My habit is to run:
 #
 #   ./go.sh | tee Q
 #
 # I can inspect file Q if needed.
 #
 # To generate a subset of systems:
 #
 #   ./go.sh dart2js,htmldartium
 #
+# To re-gen all sdk/lib files (outside of a Dartium enlistment the file
+# 'sdk/lib/js/cached_patches.dart' might not need to be generated).  To run
+# go.sh w/o the patches files used --no-cached-patches switch e.g.,
+#
+#  ./go.sh --no-cached-patches
+#
 # The following gives a picture of the changes due to 'work'
 #
 #   git checkout master               # select client without changes
 #   ./go.sh
 #   mv ../generated ../generated0     # save generated files
 #   git checkout work                 # select client with changes
 #   ./go.sh
 #   meld ../generated0 ../generated   # compare directories with too
 
 ALLSYSTEMS="htmldart2js,htmldartium,_blink"
 SYSTEMS="$ALLSYSTEMS"
 
 if [[ "$1" != "" ]] ; then
-  SYSTEMS="$1"
+  if [[ "$1" =~ ^-- ]]; then
+      ARG_OPTION="$1"
+  else
+      SYSTEMS="$1"
+  fi
+fi
+
+if [[ "$2" != "" ]] ; then
+  if [[ "$2" =~ ^-- ]]; then
+      ARG_OPTION="$2"
+  else
+      SYSTEMS="$2"
+  fi
 fi
 
 reset && \
-./dartdomgenerator.py --systems="$SYSTEMS" --logging=40 --update-dom-metadata --gen-interop
+./dartdomgenerator.py --systems="$SYSTEMS" --logging=40 --update-dom-metadata --gen-interop "$ARG_OPTION"