[web] Make the fuchsia.web.Context protocol discoverable.

Bug: chromium:1010222
Change-Id: I501287458f4cd0e175f84bec9d669af679c25647
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/513742
Fuchsia-Auto-Submit: Wez . <wez@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
Reviewed-by: David Dorwin <ddorwin@google.com>
Reviewed-by: Adam Barth <abarth@google.com>
API-Review: Adam Barth <abarth@google.com>
diff --git a/sdk/fidl/fuchsia.web/context.fidl b/sdk/fidl/fuchsia.web/context.fidl
index 21c0f836..f253bc0 100644
--- a/sdk/fidl/fuchsia.web/context.fidl
+++ b/sdk/fidl/fuchsia.web/context.fidl
@@ -191,6 +191,7 @@
 };
 
 /// Manages browsing state (e.g. LocalStorage, cookies, etc) associated with a set of [`Frame`].
+[Discoverable]
 protocol Context {
     /// Creates a new [`Frame`] under this [`Context`]. Destruction of a [`Context`] triggers the
     /// destruction of all of its associated [`Frame`]. [`Frame`] can be transferred to another
diff --git a/sdk/fidl/fuchsia.web/fuchsia.web.api b/sdk/fidl/fuchsia.web/fuchsia.web.api
index 1545d2a..6a16f94 100644
--- a/sdk/fidl/fuchsia.web/fuchsia.web.api
+++ b/sdk/fidl/fuchsia.web/fuchsia.web.api
@@ -1,3 +1,3 @@
 {
-  "fidl/fuchsia.web": "ff6341a9fd80e131e58df598408d20b2"
+  "fidl/fuchsia.web": "962e07778a42d5885a21fcdd9eb0c634"
 }
\ No newline at end of file