Add WebAuthn bindings and client interface.

third_party/WebKit/LayoutTests/webexposed/global-interface-listing-expected.txt

Index: third_party/WebKit/LayoutTests/webexposed/global-interface-listing-expected.txt
diff --git a/third_party/WebKit/LayoutTests/webexposed/global-interface-listing-expected.txt b/third_party/WebKit/LayoutTests/webexposed/global-interface-listing-expected.txt
index 8f8479af4b3258b4118229c02c21290a73c43dba..b0e82b879eae95fdecb92de6d0e62b2c671f5cae 100644
--- a/third_party/WebKit/LayoutTests/webexposed/global-interface-listing-expected.txt
+++ b/third_party/WebKit/LayoutTests/webexposed/global-interface-listing-expected.txt
@@ -257,6 +257,13 @@ interface AudioTrackList : EventTarget
     setter onaddtrack
     setter onchange
     setter onremovetrack
+interface AuthenticationAssertion
+    attribute @@toStringTag
+    getter authenticatorData
+    getter clientData
+    getter credential
+    getter signature
+    method constructor
 interface BarProp
     attribute @@toStringTag
     getter visible
@@ -4181,6 +4188,7 @@ interface Navigator
     getter appCodeName
     getter appName
     getter appVersion
+    getter authentication
     getter bluetooth
     getter budget
     getter connection
@@ -6161,6 +6169,16 @@ interface SVGViewElement : SVGElement
     getter zoomAndPan
     method constructor
     setter zoomAndPan
+interface ScopedCredential
+    attribute @@toStringTag
+    getter id
+    getter type
+    method constructor
+interface ScopedCredentialInfo
+    attribute @@toStringTag
+    getter attestation
+    getter clientData
+    method constructor
 interface Screen
     attribute @@toStringTag
     getter availHeight
@@ -7001,6 +7019,11 @@ interface WaveShaperNode : AudioNode
     method constructor
     setter curve
     setter oversample
+interface WebAuthentication
+    attribute @@toStringTag
+    method constructor
+    method getAssertion
+    method makeCredential
 interface WebGL2RenderingContext
     attribute @@toStringTag
     attribute ACTIVE_ATTRIBUTES