Add basic Chrome Web Store tests.

These tests include: a basic sanity test, 5 tests that verify that free
items can be installed, and 3 tests that verify that free trial items
can be installed.

BUG=chromium:403498
TEST=These tests pass

Change-Id: Id7aa76b4e23e5059652dbdb84f5976dcd2b0a3f5
Reviewed-on: https://chromium-review.googlesource.com/211835
Reviewed-by: Dan Shi <[email protected]>
Tested-by: Nathan Stoddard <[email protected]>
Commit-Queue: Dan Shi <[email protected]>
diff --git a/utils/unittest_suite.py b/utils/unittest_suite.py
index f9c53a2..7a84cd5 100755
--- a/utils/unittest_suite.py
+++ b/utils/unittest_suite.py
@@ -97,6 +97,7 @@
     'dev_server_test.py',
     'full_release_test.py',
     'scheduler_lib_unittest.py',
+    'webstore_test.py',
     ))
 
 LONG_TESTS = (REQUIRES_MYSQLDB |