ServiceWorker: Reset message in serviceworker-internals with update

Currently, when there are two registration and above one is unregistered, console message by above registration is left in top console box though the bottom one goes to the top. Then, the message in each box is set to the message recorded internally when update() is called.

BUG=418568
TEST=N/A

Review URL: https://codereview.chromium.org/653283004

Cr-Commit-Position: refs/heads/master@{#300027}

content/browser/resources/service_worker/serviceworker_internals.js

@@ -76,7 +76,7 @@ cr.define('serviceworker', function() {
 
   var allLogMessages = {};
   // Set log for a worker version.
-  function fillLogForVersion(partition_id, version) {
+  function fillLogForVersion(container, partition_id, version) {
     if (!version) {
       return;
     }
@@ -89,6 +89,14 @@ cr.define('serviceworker', function() {
     } else {
       version.log = '';
     }
+    var logAreas = container.querySelectorAll('textarea.serviceworker-log');
+    for (var i = 0; i < logAreas.length; ++i) {
+      var logArea = logAreas[i];
+      if (logArea.partition_id == partition_id &&
+          logArea.version_id == version.version_id) {
+        logArea.value = version.log;
+      }
+    }
   }
 
   // Get the unregistered workers.
@@ -157,7 +165,7 @@ cr.define('serviceworker', function() {
       template = jstGetTemplate('serviceworker-list-template');
       container.appendChild(template);
     }
-    var fillLogFunc = fillLogForVersion.bind(this, partition_id);
+    var fillLogFunc = fillLogForVersion.bind(this, container, partition_id);
     stored_registrations.forEach(function(registration) {
       [registration.active, registration.waiting].forEach(fillLogFunc);
     });
@@ -239,7 +247,7 @@ cr.define('serviceworker', function() {
     for (var i = 0; i < logAreas.length; ++i) {
       var logArea = logAreas[i];
       if (logArea.partition_id == partition_id &&
-        logArea.version_id == version_id) {
+          logArea.version_id == version_id) {
         logArea.value += message;
       }
     }