Support Mac android cross compile.

pylib/gyp/common.py

Index: pylib/gyp/common.py
===================================================================
--- pylib/gyp/common.py	(revision 1452)
+++ pylib/gyp/common.py	(working copy)
@@ -360,6 +360,15 @@
   flavor = flavors.get(sys.platform, 'linux')
   return params.get('flavor', flavor)
 
+def GetHostFlavor(params):
+  """Returns |params.options.host_flavor | if it's set, the system's default

[Torne, 2012/08/14 11:04:01]

No whitespace between the variable name and |

+  flavor else."""
+  options = params.get('options')
+  if options.host_flavor:
+    host_flavor = options.host_flavor
+  else:
+    host_flavor = GetFlavor({})
+  return host_flavor;
 
 def CopyTool(flavor, out_path):
   """Finds (mac|sun|win)_tool.gyp in the gyp directory and copies it