In android_commands.py, surround pexpect import in try-except.

build/android/pylib/android_commands.py

Index: build/android/pylib/android_commands.py
diff --git a/build/android/pylib/android_commands.py b/build/android/pylib/android_commands.py
index 8a1562caad5e298bff78291404890ead877ecd40..4eae1b729e535abddfa702b8ad63e00189cfb61f 100644
--- a/build/android/pylib/android_commands.py
+++ b/build/android/pylib/android_commands.py
@@ -19,7 +19,12 @@ import tempfile
 import time
 
 import io_stats_parser
-from pylib import pexpect
+# pexpect is not available on all platforms. We allow this file to be imported
+# on platforms without pexpect and only fail when pexpect is actually used.

[bulach, 2012/10/23 10:41:25]

nit: nduca added our own wrapper in build/android/pylib/pexpect.py that tries to
load the module..
would it work to add the try..except block directly there instead?

+try:
+  from pylib import pexpect
+except:
+  pexpect = None
 
 CHROME_SRC = os.path.join(
     os.path.abspath(os.path.dirname(__file__)), '..', '..', '..')