Update the build rule for media router tests (e2e) and the mapping.

Review-Url: https://codereview.chromium.org/2511033002
Cr-Commit-Position: refs/heads/master@{#434860}

chrome/test/media_router/BUILD.gn

@@ -2,6 +2,19 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+group("media_router_tests") {
+  testonly = true
+  data_deps = [
+    "//chrome/test:browser_tests",
+  ]
+  data = [
+    "$root_out_dir/mr_extension/",
+    "internal/",
+    "../../../media/test/data/player.html",
+    "../../../media/test/data/bear-vp9-opus.webm",
+  ]
+}
+
 # Browser test resource files.
 media_router_integration_test_resources = [
   "resources/basic_test.html",

testing/buildbot/gn_isolate_map.pyl

@@ -566,6 +566,17 @@
     "label": "//media/blink:media_blink_unittests",
     "type": "windowed_test_launcher",
   },
+  "media_router_tests": {
+    "label": "//chrome/test/media_router:media_router_tests",
+    "type": "script",
+    "script": "//chrome/test/media_router/internal/media_router_tests.py",
+    "args": [
+      "--extension",
+      "mr_extension/",
+      "--test_binary",
+      "./browser_tests",
+    ],
+  },
   "midi_unittests": {
     "label": "//media/midi:midi_unittests",
     "type": "windowed_test_launcher",

testing/buildbot/manage.py

@@ -167,6 +167,7 @@ SKIP_GN_ISOLATE_MAP_TARGETS = {
   'content_junit_tests',
   'content_junit_tests',
   'junit_unit_tests',
+  'media_router_tests',
   'net_junit_tests',
   'net_junit_tests',
   'ui_junit_tests',