MediaPerceptionPrivate API impl and testing.

extensions/BUILD.gn

 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//extensions/features/features.gni")
 import("//testing/test.gni")
 import("//tools/grit/grit_rule.gni")
 import("//tools/grit/repack.gni")
 
 assert(enable_extensions)
 
@@ skipping 238 matching lines @@
 # and these moved to the extensions_browsertests target. Currently, we solve
 # the problem by making this a source set and linking it into
 # //chrome/test:browser_tests.
 source_set("chrome_extensions_browsertests") {
   testonly = true
   sources = [
     "browser/api/app_window/app_window_apitest.cc",
     "browser/api/bluetooth/bluetooth_apitest.cc",
     "browser/api/bluetooth/bluetooth_private_apitest.cc",
     "browser/api/cast_channel/cast_channel_apitest.cc",
+    "browser/api/media_perception_private/media_perception_private_apitest.cc",

[tbarzic, 2017/05/12 18:59:20]

the api tests should be run under extensions_browsertests not browser_tests
Please add this to browser tests in extensions/browser/BUILD.gn

     "browser/api/runtime/runtime_apitest.cc",
     "browser/api/serial/serial_apitest.cc",
     "browser/api/usb/usb_manual_apitest.cc",
     "browser/app_window/app_window_browsertest.cc",
     "browser/guest_view/extension_options/extension_options_apitest.cc",
     "browser/guest_view/mime_handler_view/mime_handler_view_browsertest.cc",
     "renderer/console_apitest.cc",
     "renderer/script_context_browsertest.cc",
   ]
 
@@ skipping 86 matching lines @@
     "//testing/gtest",
     "//third_party/hunspell",
     "//third_party/icu",
     "//third_party/libpng",
     "//third_party/zlib",
     "//ui/base:test_support",
     "//ui/resources:ui_test_pak",
     "//ui/web_dialogs:test_support",
   ]
 }