Linux: Add a script to generate a Precise dpkg admin dir for use with official builds on Trusty.

build/linux/sysroot_scripts/sysroot-creator.sh

Index: build/linux/sysroot_scripts/sysroot-creator.sh
diff --git a/build/linux/sysroot_scripts/sysroot-creator.sh b/build/linux/sysroot_scripts/sysroot-creator.sh
index 64d9ab44672abb0c08f79bd4968adc7a6a14132d..987a8a139c92f85966c11c1686a77d2d33174303 100644
--- a/build/linux/sysroot_scripts/sysroot-creator.sh
+++ b/build/linux/sysroot_scripts/sysroot-creator.sh
@@ -807,6 +807,24 @@ UpdatePackageListsAll() {
   RunCommand UpdatePackageListsMips
 }
 
+#@
+#@ ListPackagesI386
+#@
+#@    Lists all packages necessary to build chrome for i386
+ListPackagesI386() {
+  echo "${DEBIAN_PACKAGES} ${DEBIAN_PACKAGES_X86:=}" |
+    sed -e 's/^[[:space:]]*//' | sed '/^$/d' > "$1"
+}
+
+#@
+#@ ListPackagesAmd64
+#@
+#@    Lists all packages necessary to build chrome for amd64
+ListPackagesAmd64() {
+  echo "${DEBIAN_PACKAGES} ${DEBIAN_PACKAGES_AMD64:=}" |
+    sed -e 's/^[[:space:]]*//' | sed '/^$/d' > "$1"
+}
+
 RunCommand() {
   SetEnvironmentVariables "$1"
   SanityCheck