installer/linux: add symbolic icon for use in gnome-shell

chrome/installer/linux/common/postinst.include

 # Add icons to the system icons
 XDG_ICON_RESOURCE="`which xdg-icon-resource 2> /dev/null || true`"
 if [ ! -x "$XDG_ICON_RESOURCE" ]; then
   echo "Error: Could not find xdg-icon-resource" >&2
   exit 1
 fi
 for icon in "@@INSTALLDIR@@/product_logo_"*.png; do
   size="${icon##*/product_logo_}"
   "$XDG_ICON_RESOURCE" install --size "${size%.png}" "$icon" "@@PACKAGE@@"
 done
 
+for icon in "@@INSTALLDIR@@/product_symbolic_logo_"*.symbolic.png; do

[Tom (Use chromium acct), 2017/02/23 03:11:35]

Would it be possible to combine this and the above for loop?

+  size="${icon##*/product_symbolic_logo_}"
+  "$XDG_ICON_RESOURCE" install --size "${size%.symbolic.png}" "$icon" "@@PACKAGE@@-symbolic.symbolic"

[Lei Zhang, 2017/02/23 07:28:31]

Like with most code, we limit ourselves to 80 chars / line.

+done
+
 UPDATE_MENUS="`which update-menus 2> /dev/null || true`"
 if [ -x "$UPDATE_MENUS" ]; then
   update-menus
 fi
 
 # Update cache of .desktop file MIME types. Non-fatal since it's just a cache.
 update-desktop-database > /dev/null 2>&1 || true
 
 # Updates defaults.list file if present.
 update_defaults_list() {
@@ skipping 47 matching lines @@
 # (the patch is safe to leave even after uninstall), update it.
 GNOME_DFL_APPS=/usr/share/gnome-control-center/default-apps/gnome-default-applications.xml
 if [ -f "$GNOME_DFL_APPS" ]; then
 # Conditionally insert the contents of the file "default-app-block" after the
 # first "<web-browsers>" line we find in gnome-default-applications.xml
   fgrep -q "@@MENUNAME@@" "$GNOME_DFL_APPS" || insert_after_first_match \
     "$GNOME_DFL_APPS" \
     "^[         ]*<web-browsers>[       ]*$" \
     "@@INSTALLDIR@@/default-app-block"
 fi