Add script for generating a source tarball and rules for bilding a Debian package

tools/utils.py

Index: tools/utils.py
diff --git a/tools/utils.py b/tools/utils.py
index 1c460fcf24dba3c5601143242b165993c2b51732..cda1f94f0aadea56a5cfeb86de2f83588880a854 100644
--- a/tools/utils.py
+++ b/tools/utils.py
@@ -339,6 +339,16 @@ def GetSVNRevision():
   if revision:
     return revision
 
+  # When building from tarball use tools/SVN_REVISION
+  svn_revision_file = os.path.join(DART_DIR, 'tools', 'SVN_REVISION')
+  try:
+    fd = open(svn_revision_file)
+    content = fd.read()
+    fd.close()
+    return content
+  except:
+    pass
+
   # Only fail on the buildbot in case of a SVN client version mismatch.
   user = GetUserName()
   if user != 'chrome-bot':