Increase timeout for Signal benchmarking

Change-Id: Idc2b03cecb8d420a03a7ec67dcf564860c799074
diff --git a/tools/run_on_app_dump.py b/tools/run_on_app_dump.py
index 964d1dc..9ca17ac 100755
--- a/tools/run_on_app_dump.py
+++ b/tools/run_on_app_dump.py
@@ -299,6 +299,7 @@
         'url': 'https://github.com/signalapp/Signal-Android',
         'revision': '91ca19f294362ccee2c2b43c247eba228e2b30a1',
         'folder': 'signal-android',
+        'golem_duration': 300
     }),
     # TODO(b/172815827): Monkey runner does not work
     App({