Fix the event stream logging checkbox

1. the <input> for this preference was actually missing.
2. when enabled, we should also dump the output log to the console

Change-Id: I7852dc3dcc6ef8b8164d4e74e1483e1664bd049d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1639326Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Sara Kato <sarakato@chromium.org>
Commit-Queue: Sara Kato <sarakato@chromium.org>
Auto-Submit: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665837}

chrome/browser/resources/chromeos/chromevox/chromevox/background/options.html

@@ -210,6 +210,8 @@
   </div>
   <div class="option" id="developerEventStream">
     <label>
+      <input id="enableEventStreamLogging" type="checkbox"
+             class="checkbox pref logging" name="enableEventStreamLogging">
       <span class="i18n" msgid="options_event_stream_logging">
         Enable event stream logging
       </span>

chrome/browser/resources/chromeos/chromevox/cvox2/background/event_stream_logger.js

@@ -59,7 +59,7 @@ EventStreamLogger.prototype = {
     logStr += ', TargetName = ' + evt.target.name;
     logStr += ', RootName = ' + evt.target.root.name;
     logStr += ', DocumentURL = ' + evt.target.docUrl;
-
+    console.log(logStr);
     LogStore.getInstance().writeTextLog(logStr, TextLog.LogType.EVENT);
   },