#This should fetch Crosswalk into src/xwalk and generate a
#   .gclient-xwalk with the other dependencies.
gclient sync

#This will fetch all the other source files but not run any hooks.
gclient sync --gclientfile=.gclient-xwalk --nohooks [aka -n]

#Generate the LASTCHANGE files.
python $source_root/src/build/util/lastchange.py \
       -o $source_root/src/build/util/LASTCHANGE \
       -s $source_root/src

python $source_root/src/build/util/lastchange.py \
       -o $source_root/src/build/util/LASTCHANGE.blink \
       -s $source_root/src/third_party/WebKit