Bind Window focus ability to the ExecutionContext instead of the process.

Source/web/tests/WebScopedWindowFocusAllowedIndicatorTest.cpp

Index: Source/web/tests/WebScopedWindowFocusAllowedIndicatorTest.cpp
diff --git a/Source/web/tests/WebScopedWindowFocusAllowedIndicatorTest.cpp b/Source/web/tests/WebScopedWindowFocusAllowedIndicatorTest.cpp
index ac7f0f1f87305fb9e112e22bc84577c0136769e2..970a542ab0fde1cd025bb0488307c6f49ce64818 100644
--- a/Source/web/tests/WebScopedWindowFocusAllowedIndicatorTest.cpp
+++ b/Source/web/tests/WebScopedWindowFocusAllowedIndicatorTest.cpp
@@ -31,10 +31,11 @@
 #include "config.h"
 #include "public/web/WebScopedWindowFocusAllowedIndicator.h"
 
+#include "core/dom/Document.h"
 #include "core/page/WindowFocusAllowedIndicator.h"
+#include "public/web/WebDocument.h"
 #include <gtest/gtest.h>
 
-
 using namespace blink;
 
 namespace {
@@ -54,4 +55,22 @@ TEST(WebScopedWindowFocusAllowedIndicatorTest, Basic)
     EXPECT_FALSE(WindowFocusAllowedIndicator::windowFocusAllowed());
 }
 
+TEST(WebScopedWindowFocusAllowedIndicatorTest, WithDocument)
+{
+    RefPtrWillBePersistent<Document> document = Document::create();
+    WebDocument webDocument(document);
+
+    EXPECT_FALSE(document->isWindowFocusAllowed());
+    {
+        WebScopedWindowFocusAllowedIndicator indicator1(&webDocument);
+        EXPECT_TRUE(document->isWindowFocusAllowed());
+        {
+            WebScopedWindowFocusAllowedIndicator indicator2(&webDocument);
+            EXPECT_TRUE(document->isWindowFocusAllowed());
+        }
+        EXPECT_TRUE(document->isWindowFocusAllowed());
+    }
+    EXPECT_FALSE(document->isWindowFocusAllowed());
+}
+
 }