Changes android.py to wait longer with --wait-for-debugger

Otherwise it exits before I've had a chance to attach the debugger.

BUG=none
TEST=none
R=msw@chromium.org

Review URL: https://codereview.chromium.org/1129233007

Cr-Commit-Position: refs/heads/master@{#329864}

mojo/tools/mopy/android.py

@@ -359,7 +359,11 @@ class AndroidShell(object):
       subprocess.check_call(self._CreateADBCommand(
           ['shell', 'rm', '-f', STDOUT_PIPE]))
       parameters.append('--fifo-path=%s' % STDOUT_PIPE)
-      self._ReadFifo(STDOUT_PIPE, stdout, on_application_stop)
+      max_attempts = 5
+      if '--wait-for-debugger' in arguments:
+        max_attempts = 200
+      self._ReadFifo(STDOUT_PIPE, stdout, on_application_stop,
+                     max_attempts=max_attempts)
 
     # Extract map-origin arguments.
     map_parameters, other_parameters = _Split(arguments, _IsMapOrigin)