Change Event.deepPath to a method

In order to make clear that computation is performed, Event.deepPath has been changed to a method Event.deepPath(), that returns sequence<EventTarget>.
See the discussion here: https://github.com/w3c/webcomponents/issues/361
Described in the spec here : http://w3c.github.io/webcomponents/spec/shadow/#widl-Event-deepPath-sequence-EventTarget
See the spec change here: https://github.com/w3c/webcomponents/commit/ed93413f9a37a6bfbd774cb2e09e14a76c87d56c
BUG=531990

Committed: https://crrev.com/b9279be7d61887c171d5c1cefa114292c84b9957
Cr-Commit-Position: refs/heads/master@{#372596}

Review URL: https://codereview.chromium.org/1637813002

Cr-Commit-Position: refs/heads/master@{#376103}

third_party/WebKit/LayoutTests/fast/dom/shadow/event-deep-path.html

@@ -7,8 +7,8 @@
 
 img.onload = function(e) {
     test(function() {
-        assert_array_equals(e.deepPath, e.path);
-    }, "Event.deepPath should be the same as Event.path.");
+        assert_array_equals(e.deepPath(), e.path);
+    }, "Event.deepPath() should be the same as Event.path.");
 };
 
 </script>

third_party/WebKit/LayoutTests/fast/xmlhttprequest/xmlhttprequest-get-expected.txt

@@ -47,7 +47,7 @@ bubbles : 'false'
 cancelBubble : 'false'
 cancelable : 'false'
 currentTarget : '[object XMLHttpRequest]'
-deepPath : ''
+deepPath : 'function deepPath() { [native code] }'
 defaultPrevented : 'false'
 eventPhase : '2'
 initEvent : 'function initEvent() { [native code] }'

third_party/WebKit/LayoutTests/http/tests/serviceworker/webexposed/global-interface-listing-service-worker-expected.txt

@@ -145,7 +145,6 @@ interface Event
     getter cancelBubble
     getter cancelable
     getter currentTarget
-    getter deepPath
     getter defaultPrevented
     getter eventPhase
     getter path
@@ -156,6 +155,7 @@ interface Event
     getter timeStamp
     getter type
     method constructor
+    method deepPath
     method initEvent
     method preventDefault
     method stopImmediatePropagation

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

@@ -148,7 +148,6 @@ Starting worker: resources/global-interface-listing.js
 [Worker]     getter cancelBubble
 [Worker]     getter cancelable
 [Worker]     getter currentTarget
-[Worker]     getter deepPath
 [Worker]     getter defaultPrevented
 [Worker]     getter eventPhase
 [Worker]     getter path
@@ -159,6 +158,7 @@ Starting worker: resources/global-interface-listing.js
 [Worker]     getter timeStamp
 [Worker]     getter type
 [Worker]     method constructor
+[Worker]     method deepPath
 [Worker]     method initEvent
 [Worker]     method preventDefault
 [Worker]     method stopImmediatePropagation

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

@@ -1396,7 +1396,6 @@ interface Event
     getter cancelBubble
     getter cancelable
     getter currentTarget
-    getter deepPath
     getter defaultPrevented
     getter eventPhase
     getter path
@@ -1407,6 +1406,7 @@ interface Event
     getter timeStamp
     getter type
     method constructor
+    method deepPath
     method initEvent
     method preventDefault
     method stopImmediatePropagation

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

@@ -136,7 +136,6 @@ Starting worker: resources/global-interface-listing.js
 [Worker]     getter cancelBubble
 [Worker]     getter cancelable
 [Worker]     getter currentTarget
-[Worker]     getter deepPath
 [Worker]     getter defaultPrevented
 [Worker]     getter eventPhase
 [Worker]     getter path
@@ -147,6 +146,7 @@ Starting worker: resources/global-interface-listing.js
 [Worker]     getter timeStamp
 [Worker]     getter type
 [Worker]     method constructor
+[Worker]     method deepPath
 [Worker]     method initEvent
 [Worker]     method preventDefault
 [Worker]     method stopImmediatePropagation

third_party/WebKit/Source/core/events/Event.idl

@@ -66,7 +66,8 @@
     // Shadow DOM
     // https://w3c.github.io/webcomponents/spec/shadow/#extensions-to-event-interface
     [MeasureAs=EventPath, CallWith=ScriptState] readonly attribute EventTarget[] path;
-    [RuntimeEnabled=ShadowDOMV1, ImplementedAs=path, MeasureAs=EventDeepPath, CallWith=ScriptState] readonly attribute EventTarget[] deepPath;
+    [RuntimeEnabled=ShadowDOMV1, ImplementedAs=path, MeasureAs=EventDeepPath, CallWith=ScriptState] sequence<EventTarget> deepPath();
+
     // Non-standard APIs
     const unsigned short MOUSEDOWN = 1;
     const unsigned short MOUSEUP   = 2;

third_party/WebKit/Source/devtools/front_end/ui/Tooltip.js

@@ -33,7 +33,7 @@ WebInspector.Tooltip.prototype = {
      */
     _mouseMove: function(event)
     {
-        var path = event.path;
+        var path = event.deepPath() ? event.deepPath() : event.path;
         if (!path || event.buttons !== 0)
             return;