Add android_sdk to third_party to be used by golem when benchmarking

Right now the runners cannot build the target because they are missing
the android sdk.

Change-Id: I5d8ba65e1b1090628957c7285dc26edb2bd69e67
diff --git a/tools/golem.py b/tools/golem.py
index a535133..6552145 100755
--- a/tools/golem.py
+++ b/tools/golem.py
@@ -9,6 +9,7 @@
 
 LINKED_THIRD_PARTY_DIRECTORIES = [
     'android_jar',
+    'android_sdk',
     'benchmarks',
     'framework',
     'gmail',