This change adds the Mojo implementation of authenticator.mojom's MakeCredential.

The remainder of the implementation to call U2F.register() is in a follow-up CL.

BUG=664630
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

Review-Url: https://codereview.chromium.org/2788823002
Cr-Commit-Position: refs/heads/master@{#483675}
diff --git a/content/browser/BUILD.gn b/content/browser/BUILD.gn
index 4a4410c..4fdcfe9 100644
--- a/content/browser/BUILD.gn
+++ b/content/browser/BUILD.gn
@@ -1528,6 +1528,8 @@
     "web_contents/web_drag_source_mac.mm",
     "web_contents/web_drag_utils_win.cc",
     "web_contents/web_drag_utils_win.h",
+    "webauth/authenticator_impl.cc",
+    "webauth/authenticator_impl.h",
     "websockets/websocket_handshake_request_info_impl.cc",
     "websockets/websocket_handshake_request_info_impl.h",
     "websockets/websocket_impl.cc",