Let render frames connect to image_annotation service via browser

This CL adds a service manifest for image_annotation service and adds
this service as a packaged service of Chrome browser.

Chrome's content_browser manifest is updated to provide image Annotator
interface. The browser forwards Annotator requests from frames onward
to the image_annotation service.

Bug: 916420
Change-Id: I16ca72c1448c60824198a74cc53bbd3ff752bbbc
Reviewed-on: https://chromium-review.googlesource.com/c/1424623
Reviewed-by: Sam McNally <[email protected]>
Reviewed-by: David Roger <[email protected]>
Reviewed-by: Jochen Eisinger <[email protected]>
Reviewed-by: Ken Rockot <[email protected]>
Reviewed-by: Michael Martis <[email protected]>
Commit-Queue: Andrew Moylan <[email protected]>
Cr-Commit-Position: refs/heads/master@{#627132}
diff --git a/chrome/browser/DEPS b/chrome/browser/DEPS
index 4ad669e4..d1938c14 100644
--- a/chrome/browser/DEPS
+++ b/chrome/browser/DEPS
@@ -71,6 +71,7 @@
   "+services/data_decoder/public",
   "+services/device/public",
   "+services/identity/public",
+  "+services/image_annotation/public",
   "+services/media_session/public",
   "+services/metrics/metrics_mojo_service.h",
   "+services/metrics/public",