Added ios_web_view_inttests test suite to the bots.

ios/build/bots/tests/common_tests.json

 {
   "tests": [
     {
       "app": "base_unittests"
     },
     {
       "app": "boringssl_crypto_tests"
     },
     {
       "app": "boringssl_ssl_tests"
@@ skipping 16 matching lines @@
     {
       "app": "ios_net_unittests"
     },
     {
       "app": "ios_web_inttests"
     },
     {
       "app": "ios_web_unittests"
     },
     {
+      "app": "ios_web_view_inttests"

[Eugene But (OOO till 7-30), 2017/06/20 02:20:45]

Sylvain, by any chance do you know why code signature is missing for framework
which does not allow launching the test?

The launch failure log is here:
https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Ftryserver.chromium.mac%2...

+    },
+    {
       "app": "net_unittests"
     },
     {
       "app": "skia_unittests"
     },
     {
       "app": "sql_unittests"
     },
     {
       "app": "ui_base_unittests"
     },
     {
       "app": "url_unittests"
     }
   ]
 }