Add logspam to help diagnose flaky tests

chrome/test/data/extensions/api_test/automation/tests/tabs_automation_boolean/common.js

Index: chrome/test/data/extensions/api_test/automation/tests/tabs_automation_boolean/common.js
diff --git a/chrome/test/data/extensions/api_test/automation/tests/tabs_automation_boolean/common.js b/chrome/test/data/extensions/api_test/automation/tests/tabs_automation_boolean/common.js
index 07f98d0603202fcd6aa72d3db91be72531632def..8d77c3d902efa7b5b0ef191788f13c5d4f0d68fb 100644
--- a/chrome/test/data/extensions/api_test/automation/tests/tabs_automation_boolean/common.js
+++ b/chrome/test/data/extensions/api_test/automation/tests/tabs_automation_boolean/common.js
@@ -17,10 +17,15 @@ function setUpAndRunTests(allTests) {
     function gotTree(returnedRootNode) {
       rootNode = returnedRootNode;
       if (rootNode.attributes.docLoaded) {
+        console.log('In getTree() callback: ' +
+                    'docLoaded attr already true; running tests');
         chrome.test.runTests(allTests);
         return;
       }
+      console.log('In getTree() callback: ' +
+                  'docLoaded false; waiting for loadComplete');
       rootNode.addEventListener('loadComplete', function() {
+        console.log('loadComplete received; running tests.');
         chrome.test.runTests(allTests);
       });
     }