Add a simple mojo AxProvider apptest.

Add ax_provider_apptest.cc and a new html_viewer_apptest target.
Host net/data/test.html via net::SpawnedTestServer, check the AxTree.

Delay binding AxProvider interface requests until the document loads.
(this makes clients wait for a valid accessibility tree to be generated)

Remove the debug condition for building Mojo test targets.
Add TestTimeout init for net::SpawnedTestServer as in mojo CL:
  https://codereview.chromium.org/952613004/

TODO: Update chromium_mojo.py recipe and mojo/tools/data/apptests:
  https://codereview.chromium.org/1069503004/
  https://codereview.chromium.org/1065093002/
TODO: Plumb actual command line args for test timeout init.
TODO: Move html_viewer test files to a subdirectory.

(this CL was split out from https://codereview.chromium.org/1049013004/)

BUG=NONE
TEST=New test passes.
R=sky@chromium.org,ben@chromium.org

Review URL: https://codereview.chromium.org/1062563002

Cr-Commit-Position: refs/heads/master@{#324657}

1 files changed, 1 insertions, 0 deletions

diff --git a/BUILD.gn b/BUILD.gn
index 09913a9..760be04 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -648,6 +648,7 @@ group("gn_mojo_targets") {
 
     if (!is_debug) {
       deps += [
+        "//mojo/services/html_viewer:apptests",
         "//mojo/services/html_viewer:tests",
         "//mojo/services/network:apptests",
       ]