MediaPerceptionPrivate API impl and testing.

extensions/browser/BUILD.gn

Index: extensions/browser/BUILD.gn
diff --git a/extensions/browser/BUILD.gn b/extensions/browser/BUILD.gn
index aa65f0d1f5edc3379247e228153dbda1cd07d928..75d9c2f590948e1ff336da1f4b104d632fd6b462 100644
--- a/extensions/browser/BUILD.gn
+++ b/extensions/browser/BUILD.gn
@@ -324,6 +324,7 @@ source_set("browser_tests") {
     "api/display_source/display_source_apitestbase.h",
     "api/dns/dns_apitest.cc",
     "api/hid/hid_apitest.cc",
+    "api/media_perception_private/media_perception_private_apitest.cc",
     "api/printer_provider/printer_provider_apitest.cc",
     "api/socket/socket_apitest.cc",
     "api/sockets_tcp/sockets_tcp_apitest.cc",
@@ -416,6 +417,8 @@ source_set("unit_tests") {
     "api/file_handlers/directory_util_unittest.cc",
     "api/file_handlers/mime_util_unittest.cc",
     "api/idle/idle_api_unittest.cc",
+    "api/media_perception_private/conversion_utils_unittest.cc",
+    "api/media_perception_private/media_perception_api_manager_unittest.cc",
     "api/mime_handler_private/mime_handler_private_unittest.cc",
     "api/networking_config/networking_config_service_chromeos_unittest.cc",
     "api/networking_private/networking_private_chromeos_unittest.cc",