Enable forwarder2 for all our tests.

build/android/pylib/ports.py

Index: build/android/pylib/ports.py
diff --git a/build/android/pylib/ports.py b/build/android/pylib/ports.py
index be994c362c74a0ec26f98688d72fb573fc20cfa6..e9b6b901e03d25497a1ac78749e891c0bf165a2c 100644
--- a/build/android/pylib/ports.py
+++ b/build/android/pylib/ports.py
@@ -46,6 +46,7 @@ def AllocateTestServerPort():
     TEST_SERVER_PORT_LAST. Returning 0 means no more valid port can be used.
   """
   port = 0
+  ports_tried = []
   try:
     fp_lock = open(constants.TEST_SERVER_PORT_LOCKFILE, 'w')
     fcntl.flock(fp_lock, fcntl.LOCK_EX)
@@ -53,8 +54,10 @@ def AllocateTestServerPort():
     assert os.path.exists(constants.TEST_SERVER_PORT_FILE)
     with open(constants.TEST_SERVER_PORT_FILE, 'r+') as fp:
       port = int(fp.read())
+      ports_tried.append(port)
       while IsHostPortUsed(port):
         port += 1
+        ports_tried.append(port)
       if (port > constants.TEST_SERVER_PORT_LAST or
           port < constants.TEST_SERVER_PORT_FIRST):
         port = 0
@@ -67,7 +70,11 @@ def AllocateTestServerPort():
     if fp_lock:
       fcntl.flock(fp_lock, fcntl.LOCK_UN)
       fp_lock.close()
-  logging.info('Allocate port %d for test server.', port)
+  if port:
+    logging.info('Allocate port %d for test server.', port)
+  else:
+    logging.error('Could not allocate port for test server. '
+                  'List of ports tried: %s', str(ports_tried))
   return port