Show origin for Paint/LayoutWorklet in DevTools context selector

Previously, an opaque origin is passed to
MainThreadDebugger::ContextCreated() for Paint/Layout worklets,
and caused the origins in the context selector shown as "IFrame".

This CL passes DocumentSecurityOrigin() instead, which is the
origin of the Document that creates the worklets, and thus
shows the correct origin.

Bug: 866666, 861564
Change-Id: Ic038b3901ed0e301e4d2d9afdf632f7caf6add77
Reviewed-on: https://chromium-review.googlesource.com/1141290Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578754}

third_party/WebKit/LayoutTests/http/tests/devtools/console/paintworklet-console-selector-expected.txt

 Tests console execution context selector for paintworklet.
 
 Console context selector:
-* top 
-  ____PaintWorklet #1 
-  ____PaintWorklet #2 
+* top / 127.0.0.1:8000 
+  ____PaintWorklet #1 / 127.0.0.1:8000 
+  ____PaintWorklet #2 / 127.0.0.1:8000 
 

third_party/WebKit/LayoutTests/http/tests/devtools/console/paintworklet-console-selector.js

@@ -27,7 +27,7 @@
   TestRunner.addResult('Console context selector:');
   for (var executionContext of selector._items) {
     var selected = UI.context.flavor(SDK.ExecutionContext) === executionContext;
-    var text = '____'.repeat(selector._depthFor(executionContext)) + selector.titleFor(executionContext);
+    var text = '____'.repeat(selector._depthFor(executionContext)) + selector.titleFor(executionContext) + " / " + selector._subtitleFor(executionContext);
     var disabled = !selector.isItemSelectable(executionContext);
     TestRunner.addResult(`${selected ? '*' : ' '} ${text} ${disabled ? '[disabled]' : ''}`);
   }

third_party/blink/renderer/core/layout/custom/layout_worklet_global_scope.cc

@@ -34,7 +34,7 @@ LayoutWorkletGlobalScope* LayoutWorkletGlobalScope::Create(
   global_scope->ScriptController()->InitializeContextIfNeeded(context_name);
   MainThreadDebugger::Instance()->ContextCreated(
       global_scope->ScriptController()->GetScriptState(),
-      global_scope->GetFrame(), global_scope->GetSecurityOrigin());
+      global_scope->GetFrame(), global_scope->DocumentSecurityOrigin());
   return global_scope;
 }
 

third_party/blink/renderer/modules/csspaint/paint_worklet_global_scope.cc

@@ -101,7 +101,7 @@ PaintWorkletGlobalScope* PaintWorkletGlobalScope::Create(
   global_scope->ScriptController()->InitializeContextIfNeeded(context_name);
   MainThreadDebugger::Instance()->ContextCreated(
       global_scope->ScriptController()->GetScriptState(),
-      global_scope->GetFrame(), global_scope->GetSecurityOrigin());
+      global_scope->GetFrame(), global_scope->DocumentSecurityOrigin());
   return global_scope;
 }