Oilpan: introduce sticky forcedForTesting flag to ensure that a precise

LayoutTests/fast/forms/associatedFormControls-leak-nodes.html

Index: LayoutTests/fast/forms/associatedFormControls-leak-nodes.html
diff --git a/LayoutTests/fast/forms/associatedFormControls-leak-nodes.html b/LayoutTests/fast/forms/associatedFormControls-leak-nodes.html
index 0b7af5004844caace3842b8de4ca48086b9bbeec..1325d06999a507fd24a726c6466987791caca1ea 100644
--- a/LayoutTests/fast/forms/associatedFormControls-leak-nodes.html
+++ b/LayoutTests/fast/forms/associatedFormControls-leak-nodes.html
@@ -8,19 +8,25 @@
 if (!window.internals) {
     debug("This test only runs on \"content_shell --dump-render-tree\", as it requires existence of window.internals.");
 } else {
-    gc();
-    var documentsBefore = window.internals.numberOfLiveDocuments();
+    testRunner.waitUntilDone();

[wibling-chromium, 2014/04/01 13:26:09]

Can't we wait at the end to ensure we don't exit the test until done?

[Mads Ager (chromium), 2014/04/01 13:45:38]

This is setting a flag in the test runner that this test is not done until it
calls notifyDone and it is usually done in the beginning of the test.

The only thing that matters is that it is called synchronously here. Otherwise
the layout test will exit without going back to the event loop. So, it could be
at the end of this straight-line code, but the usual placement is at the top so
I'll leave it there.

+    var documentsBefore;
+    var documentsAfter;
+    collectGarbage(function() {
+        documentsBefore = window.internals.numberOfLiveDocuments();
 
-    var frame = document.getElementById('frame');
-    frame.contentDocument.body.innerHTML = '<form></form>';
-    document.body.removeChild(frame);
-    frame = null;
+        var frame = document.getElementById('frame');
+        frame.contentDocument.body.innerHTML = '<form></form>';
+        document.body.removeChild(frame);
+        frame = null;
 
-    gc();
-    var documentsAfter = window.internals.numberOfLiveDocuments();
+        collectGarbage(function() {
+            documentsAfter = window.internals.numberOfLiveDocuments();
 
-    // -1 is from removing frame itself.
-    shouldBe('documentsBefore - 1', 'documentsAfter');
+            // -1 is from removing frame itself.
+            shouldBe('documentsBefore - 1', 'documentsAfter');
+            testRunner.notifyDone();
+        });
+    });
 }
 </script>
 </body>