Adding Arm chromium builder to waterfall.

scripts/slave/compile.py

Index: scripts/slave/compile.py
===================================================================
--- scripts/slave/compile.py	(revision 34512)
+++ scripts/slave/compile.py	(working copy)
@@ -54,7 +54,7 @@
   return result
 
 
-def common_linux_settings(command, distcc_pump=False):
+def common_linux_settings(command, distcc_pump=False, crosstool=None):
   """
   Sets desirable Linux environment variables and command-line options
   that are common to the Make and SCons builds.
@@ -74,6 +74,17 @@
   if distcc_pump:
     return
 
+  # Setup crosstool environment variables.
+  if crosstool:
+    os.environ['AR'] = crosstool + '-ar'
+    os.environ['AS'] = crosstool + '-as'
+    os.environ['CC'] = crosstool + '-gcc'
+    os.environ['CXX'] = crosstool + '-g++'
+    os.environ['LD'] = crosstool + '-ld'
+    os.environ['RANLIB'] = crosstool + '-ranlib'
+    command.append('-j4')
+    return
+
   jobs = 4
   cc = 'gcc'
   cpp = 'g++'
@@ -128,7 +139,7 @@
     command = ['pump_chrome']
   else:
     command = ['make']
-  common_linux_settings(command, options.distcc_pump)
+  common_linux_settings(command, options.distcc_pump, options.crosstool)
 
   command.append('BUILDTYPE=' + options.target)
 
@@ -310,6 +321,9 @@
     # Only works for make builds. Ask thestig if you're curious.
     option_parser.add_option('', '--distcc-pump', action="store_true",
                              help='run distcc pump mode for local testing')
+    # For linux to arm cross compile.
+    option_parser.add_option('', '--crosstool', default=None,
+                             help='optional path to crosstool toolset')
 
   options, args = option_parser.parse_args()