Use a sysroot for Chrome Linux official builds.

DEPS

 # When adding a new dependency, please update the top-level .gitignore file
 # to list the dependency's destination directory.
 
 vars = {
   # Use this googlecode_url variable only if there is an internal mirror for it.
   # If you do not know, use the full path while defining your new deps entry.
   "googlecode_url": "http://%s.googlecode.com/svn",
   "sourceforge_url": "http://%(repo)s.svn.sourceforge.net/svnroot/%(repo)s",
   "webkit_trunk": "http://src.chromium.org/blink/trunk",
   "nacl_trunk": "http://src.chromium.org/native_client/trunk",
@@ skipping 36 matching lines @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling openssl
   # and whatever else without interference from each other.
   "openssl_revision": "194187",
 
   "ios_webkit_trunk": "http://svn.webkit.org/repository/webkit/trunk",
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling openssl
   # and whatever else without interference from each other.
   "ios_webkit_revision": "147503",
+
+  # Destination for Debian sysroots for Official builds.
+  "linux_sysroot_dir":
+    "src/chrome/installer/linux/internal/sysroot_scripts/",
 }
 
 deps = {
   "src/breakpad/src":
     (Var("googlecode_url") % "google-breakpad") + "/trunk/src@1169",
 
   "src/googleurl":
     (Var("googlecode_url") % "google-url") + "/trunk@183",
 
   "src/sdch/open-vcdiff":
@@ skipping 570 matching lines @@
   {
     # Download arm sysroot image to src/arm-sysroot. This image updates
     # at about the same rate that the chrome build deps change.
     # This script is a no-op except for linux users who have
     # target_arch=arm in thier GYP_DEFINES.
     "pattern": ".",
     "action": ["python", "src/build/linux/install-arm-sysroot.py",
                "--linux-only"],
   },
   {
+    # Downloads the Debian Wheezy amd64 sysroot to
+    # chrome/installer/linux/internal/debian_wheezy_amd64-sysroot.
+    # This sysroot updates at about the same rate that the chrome build deps
+    # change.
+    # This script is a no-op except for linux users who have the following in
+    # their GYP_DEFINES:
+    #
+    # * branding=Chrome
+    # * buildtype=Official 
+    # * target_arch=x64
+    #
+    # and not:
+    #
+    # * chromeos=1
+    #
+    "pattern": ".",
+    "action": ["python",
+               Var("linux_sysroot_dir") + "install-debian.wheezy.sysroot.py",
+               "--arch=amd64",
+               "--linux-only"],
+  },
+  {
+    # Downloads the Debian Wheezy i386 sysroot to
+    # chrome/installer/linux/internal/debian_wheezy_i386-sysroot.
+    # This sysroot updates at about the same rate that the chrome build deps
+    # change.
+    # This script is a no-op except for linux users who have the following in
+    # their GYP_DEFINES:
+    #
+    # * branding=Chrome
+    # * buildtype=Official 
+    # * target_arch=ia32
+    #
+    # and not:
+    #
+    # * chromeos=1
+    #
+    "pattern": ".",
+    "action": ["python",
+               Var("linux_sysroot_dir") + "install-debian.wheezy.sysroot.py",
+               "--arch=i386",
+               "--linux-only"],
+  },
+  {
     # Pull clang on mac. If nothing changed, or on non-mac platforms, this takes
     # zero seconds to run. If something changed, it downloads a prebuilt clang,
     # which takes ~20s, but clang speeds up builds by more than 20s.
     "pattern": ".",
     "action": ["python", "src/tools/clang/scripts/update.py", "--mac-only"],
   },
   {
     # Update the cygwin mount on Windows.
     "pattern": ".",
     "action": ["python", "src/build/win/setup_cygwin_mount.py", "--win-only"],
   },
   {
     # Update LASTCHANGE. This is also run by export_tarball.py in
     # src/tools/export_tarball - please keep them in sync.
     "pattern": ".",
     "action": ["python", "src/build/util/lastchange.py",
                "-o", "src/build/util/LASTCHANGE"],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
   {
     # Check for landmines (reasons to clobber the build).
     "pattern": ".",
     "action": ["python", "src/build/landmines.py"],
   },
 ]