Re-enable flaky TranslateIframe test and add extra debug information

This test has been disabled in https://crrev.com/c/2303433 due to it
being flaky. However its stack trace matches the one observed recently
in production code (crbug.com/1107103) so we're re-enabling it now and
adding some extra debugging information in order to help us fix the
issue, as it hasn't been possible to reproduce it locally so far.

Bug: 1107103
Change-Id: Ifeee8483c83e72b52a232b71ef2437ecab6bf305
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2316101Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Hajime Hoshi <hajimehoshi@chromium.org>
Auto-Submit: Mario Sanchez Prada <mario@igalia.com>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791714}

chrome/browser/translate/translate_manager_browsertest.cc

@@ -2019,7 +2019,7 @@ class TranslateManagerWithMainFrameLanguageDetectionBrowserTest
 // TODO(https://crbug.com/1106620): Disabled due to flake and crashes.
 IN_PROC_BROWSER_TEST_F(
     TranslateManagerWithMainFrameLanguageDetectionBrowserTest,
-    DISABLED_TranslateIframe) {
+    TranslateIframe) {
   base::HistogramTester histograms;
   SetTranslateScript(kTestValidScript);
 

ui/accessibility/ax_tree.cc

@@ -1353,8 +1353,10 @@ bool AXTree::ComputePendingChangesToNode(const AXNodeData& new_data,
       if (!update_state->IncrementPendingCreateNodeCount(child_id,
                                                          new_data.id)) {
         error_ = base::StringPrintf(
-            "Node %d is already pending for creation, cannot be a new child",
-            child_id);
+            "Node %d from |new_child_id_set| is already pending for "
+            "creation, cannot be a new child (of parent %d)\n"
+            "Parent Node info:\n%s",
+            child_id, new_data.id, new_data.ToString().c_str());
         return false;
       }
     }
@@ -1406,8 +1408,10 @@ bool AXTree::ComputePendingChangesToNode(const AXNodeData& new_data,
       if (!update_state->IncrementPendingCreateNodeCount(child_id,
                                                          new_data.id)) {
         error_ = base::StringPrintf(
-            "Node %d is already pending for creation, cannot be a new child",
-            child_id);
+            "Node %d from |create_or_destroy_ids| is already pending for "
+            "creation, cannot be a new child (of parent %d)\n"
+            "Parent Node info:\n%s",
+            child_id, new_data.id, new_data.ToString().c_str());
         return false;
       }
     } else {