Add multiarch specification to apt repo config.

chrome/installer/linux/debian/build.sh

 #!/bin/bash
 #
 # 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.
 
 # TODO(mmoss) This currently only works with official builds, since non-official
 # builds don't add the "${BUILDDIR}/installer/" files needed for packaging.
 
 set -e
@@ skipping 218 matching lines @@
 VERSIONFULL="${VERSION}-${PACKAGE_RELEASE}"
 
 if [ "$BRANDING" = "google_chrome" ]; then
   source "${BUILDDIR}/installer/common/google-chrome.info"
 else
   source "${BUILDDIR}/installer/common/chromium-browser.info"
 fi
 eval $(sed -e "s/^\([^=]\+\)=\(.*\)$/export \1='\2'/" \
   "${BUILDDIR}/installer/theme/BRANDING")
 
-REPOCONFIG="deb http://dl.google.com/linux/chrome/deb/ stable main"
-SSLREPOCONFIG="deb https://dl.google.com/linux/chrome/deb/ stable main"
 verify_channel
 
 # Some Debian packaging tools want these set.
 export DEBFULLNAME="${MAINTNAME}"
 export DEBEMAIL="${MAINTMAIL}"
 
 # We'd like to eliminate more of these deps by relying on the 'lsb' package, but
 # that brings in tons of unnecessary stuff, like an mta and rpm. Until that full
 # 'lsb' package is installed by default on DEB distros, we'll have to stick with
 # the LSB sub-packages, to avoid pulling in all that stuff that's not installed
@@ skipping 65 matching lines @@
 COMMON_DEPS="${DPKG_SHLIB_DEPS}, ${ADDITION_DEPS}"
 COMMON_PREDEPS="dpkg (>= 1.14.0)"
 
 
 # Make everything happen in the OUTPUTDIR.
 cd "${OUTPUTDIR}"
 
 case "$TARGETARCH" in
   ia32 )
     export ARCHITECTURE="i386"
-    stage_install_debian
     ;;
   x64 )
     export ARCHITECTURE="amd64"
-    stage_install_debian
     ;;
   * )
     echo
     echo "ERROR: Don't know how to build DEBs for '$TARGETARCH'."
     echo
     exit 1
     ;;
 esac
+BASEREPOCONFIG="dl.google.com/linux/chrome/deb/ stable main"
+# Only use the default REPOCONFIG if it's unset (e.g. verify_channel might have
+# set it to an empty string)
+REPOCONFIG="${REPOCONFIG-deb [arch=${ARCHITECTURE}] http://${BASEREPOCONFIG}}"
+# Allowed configs include optional HTTPS support and explicit multiarch
+# platforms.
+REPOCONFIGREGEX="deb (\\\\[arch=[^]]*\\\\b${ARCHITECTURE}\\\\b[^]]*\\\\]"
+REPOCONFIGREGEX+="[[:space:]]*)?https?://${BASEREPOCONFIG}"
+stage_install_debian
 
 do_package