Bug 1791079 - Implement User Activation API r=dom-core,webidl,saschanaz,edgar

Rewrote internal user activation tree (spreading state to other elements)
logic to match HTML spec:
https://html.spec.whatwg.org/multipage/interaction.html#user-activation-processing-model

Added navigator.userActivation API to expose internal user activation.

Also fixed a WPT test to conform to spec (siblings are not activated),
see also spec issue: whatwg/html#9831

Co-authored-by: Tom Schuster <evilpiesgmail.com>

Differential Revision: https://phabricator.services.mozilla.com/D185348

UltraBlame original commit: 7c84c5fc7d0002a8bee64ebc66899437638331c6

Author: marco-c

dom/base/Document.cpp

@@ -104585,186 +104585,292 @@ NotifyUserGestureActivation
 (
 )
 {
-if
-(
+/
+/
+https
+:
+/
+/
+html
+.
+spec
+.
+whatwg
+.
+org
+/
+multipage
+/
+interaction
+.
+html
+#
+activation
+-
+notification
+/
+/
+1
+.
+"
+Assert
+:
+document
+is
+fully
+active
+.
+"
 RefPtr
 <
 BrowsingContext
 >
-bc
+currentBC
 =
 GetBrowsingContext
 (
 )
-)
-{
-bc
--
->
-PreOrderWalk
-(
-[
-&
-]
-(
-BrowsingContext
-*
-aBC
-)
-{
-WindowContext
-*
-windowContext
-=
-aBC
--
->
-GetCurrentWindowContext
-(
-)
 ;
 if
 (
 !
-windowContext
+currentBC
 )
 {
 return
 ;
 }
-nsIDocShell
-*
-docShell
-=
-aBC
--
+RefPtr
+<
+WindowContext
 >
-GetDocShell
-(
-)
-;
-if
-(
-!
-docShell
-)
-{
-return
-;
-}
-Document
-*
-document
+currentWC
 =
-docShell
--
->
-GetDocument
+GetWindowContext
 (
 )
 ;
-if
-(
-!
+/
+/
+2
+.
+"
+Let
+windows
+be
 document
-)
-{
-return
-;
-}
+'
+s
+relevant
+global
+object
+"
 /
 /
-XXXedgar
+Instead
+of
+assembling
+a
+list
 we
-probably
-could
 just
-check
-IsInProcess
-(
-)
-after
-fission
+call
+notify
+for
+wanted
+windows
+as
+we
 /
 /
-enable
-.
-if
-(
-NodePrincipal
-(
-)
+find
+them
+currentWC
 -
 >
-Equals
+NotifyUserGestureActivation
 (
+)
+;
+/
+/
+3
+.
+"
+.
+.
+.
+windows
+with
+the
+active
+window
+of
+each
+of
 document
+'
+s
+ancestor
+/
+/
+navigables
+.
+"
+for
+(
+WindowContext
+*
+wc
+=
+currentWC
+;
+wc
+;
+wc
+=
+wc
 -
 >
-NodePrincipal
+GetParentWindowContext
 (
 )
 )
-)
 {
-windowContext
+wc
 -
 >
 NotifyUserGestureActivation
 (
 )
 ;
 }
-}
-)
-;
-for
+/
+/
+4
+.
+"
+windows
+with
+the
+active
+window
+of
+each
+of
+document
+'
+s
+descendant
+/
+/
+navigables
+filtered
+to
+include
+only
+those
+navigables
+whose
+active
+/
+/
+document
+'
+s
+origin
+is
+same
+origin
+with
+document
+'
+s
+origin
+"
+currentBC
+-
+>
+PreOrderWalk
+(
+[
+&
+]
 (
+BrowsingContext
+*
 bc
+)
+{
+WindowContext
+*
+wc
 =
 bc
 -
 >
-GetParent
+GetCurrentWindowContext
 (
 )
 ;
-bc
+if
+(
+!
+wc
+)
+{
+return
 ;
-bc
+}
+/
+/
+Check
+same
+-
+origin
+as
+current
+document
+WindowGlobalChild
+*
+wgc
 =
-bc
+wc
 -
 >
-GetParent
+GetWindowGlobalChild
 (
 )
-)
-{
+;
 if
 (
-WindowContext
-*
-windowContext
-=
-bc
+!
+wgc
+|
+|
+!
+wgc
 -
 >
-GetCurrentWindowContext
+IsSameOriginWith
 (
+currentWC
 )
 )
 {
-windowContext
+return
+;
+}
+wc
 -
 >
 NotifyUserGestureActivation
 (
 )
 ;
 }
-}
-}
+)
+;
 }
 bool
 Document