Real world impact bash driver

force-enable-autosizing() {
    if grep -xq '#if HACK_FORCE_TEXT_AUTOSIZING_ON_DESKTOP' Source/core/page/Settings.cpp; then
        sed -i 's/#if HACK_FORCE_TEXT_AUTOSIZING_ON_DESKTOP/#if 1\/\/HACK_FORCE_TEXT_AUTOSIZING_ON_DESKTOP/' Source/core/page/Settings.cpp
    fi
}
real-world-impact() {
    # Set these variables
    local CHROMIUM_ROOT=/usr/local/google/home/$USER/chromium/src
    local NUM_SITES=100

    local from=master
    if [[ -n $2 ]]; then
        from="$1"
        shift
    fi
    local to="$1"

    cd $CHROMIUM_ROOT/third_party/WebKit &&
    if git show-ref --verify --quiet refs/heads/impact-before; then
        git checkout master
        git branch -D impact-before
    fi &&
    if git show-ref --verify --quiet "refs/heads/$from"; then
        gch -t -b impact-before "$from"
    else
        echo "Error: branch '$from' no found"
        return 1
    fi &&
    force-enable-autosizing &&
    git commit -a -m 'patch + hack' # no &&, as returns 1 if nothing to commit
    cd $CHROMIUM_ROOT &&
    cr build blink_tests &&
    cd $CHROMIUM_ROOT/third_party/WebKit &&
    # Run twice to reduce timing issues from it not being cached in RAM.
    $CHROMIUM_ROOT/tools/real_world_impact/real_world_impact.py before $NUM_SITES &&
    $CHROMIUM_ROOT/tools/real_world_impact/real_world_impact.py before $NUM_SITES &&
    if git show-ref --verify --quiet refs/heads/impact-after; then
        git branch -D impact-after
    fi &&
    if git show-ref --verify --quiet "refs/heads/$to"; then
        gch -t -b impact-after "$to"
    else
        echo "Error: branch '$to' no found"
        return 1
    fi &&
    force-enable-autosizing &&
    git commit -a -m 'patch + hack' &&
    cd $CHROMIUM_ROOT &&
    cr build blink_tests &&
    cd $CHROMIUM_ROOT/third_party/WebKit &&
    $CHROMIUM_ROOT/tools/real_world_impact/real_world_impact.py after $NUM_SITES &&
    $CHROMIUM_ROOT/tools/real_world_impact/real_world_impact.py compare $NUM_SITES
}