[Android] Raise more shard timeouts on Lollipop Low-End Tester.

BUG=
[email protected],[email protected]

Review-Url: https://codereview.chromium.org/1996013003
Cr-Commit-Position: refs/heads/master@{#394809}
diff --git a/build/android/pylib/gtest/gtest_test_instance.py b/build/android/pylib/gtest/gtest_test_instance.py
index 282b81d..dd3af74 100644
--- a/build/android/pylib/gtest/gtest_test_instance.py
+++ b/build/android/pylib/gtest/gtest_test_instance.py
@@ -177,7 +177,7 @@
       if self._suite in BROWSER_TEST_SUITES:
         self._extras[_EXTRA_SHARD_SIZE_LIMIT] = 1
         self._extras[EXTRA_SHARD_NANO_TIMEOUT] = int(1e9 * self._shard_timeout)
-        self._shard_timeout = 900
+        self._shard_timeout = 10 * self._shard_timeout
 
     if not self._apk_helper and not self._exe_dist_dir:
       error_func('Could not find apk or executable for %s' % self._suite)