MediaPerceptionPrivate API impl and testing.

extensions/browser/api/media_perception_private/BUILD.gn

Index: extensions/browser/api/media_perception_private/BUILD.gn
diff --git a/extensions/browser/api/media_perception_private/BUILD.gn b/extensions/browser/api/media_perception_private/BUILD.gn
index 0a8a6c6464f217c1ff9b4dd7d38744a6484e21e8..4377ed9f36974881e4697f9ff069ddf505166bb4 100644
--- a/extensions/browser/api/media_perception_private/BUILD.gn
+++ b/extensions/browser/api/media_perception_private/BUILD.gn
@@ -6,12 +6,17 @@ import("//third_party/protobuf/proto_library.gni")
 
 source_set("media_perception_private") {
   sources = [
+    "conversion_utils.cc",
+    "conversion_utils.h",
+    "media_perception_api_manager.cc",
+    "media_perception_api_manager.h",
     "media_perception_private_api.cc",
     "media_perception_private_api.h",
   ]
 
   deps = [
     "//base",
+    "//chromeos:media_perception_proto",
     "//extensions/common/api",
   ]
 }