Implement an asset_bundle Mojo service

This service takes a data pipe representing a zip file and then lets you
stream paths inside the zip file as data pipes.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1176153007.
diff --git a/services/BUILD.gn b/services/BUILD.gn
index 77f6655..9699803 100644
--- a/services/BUILD.gn
+++ b/services/BUILD.gn
@@ -4,6 +4,7 @@
 
 group("services") {
   deps = [
+    "//services/asset_bundle",
     "//services/authenticating_url_loader_interceptor",
     "//services/authentication",
     "//services/clipboard",
@@ -20,10 +21,10 @@
     "//services/native_viewport",
     "//services/prediction",
     "//services/reaper",
-    "//services/url_response_disk_cache",
     "//services/surfaces",
     "//services/test_service:bindings",
     "//services/tracing",
+    "//services/url_response_disk_cache",
     "//services/view_manager",
     "//services/window_manager",
   ]