Webview tag creation should be using storage partitions.

chrome/test/data/extensions/platform_apps/web_view_isolation/storage.js

Index: chrome/test/data/extensions/platform_apps/web_view_isolation/storage.js
diff --git a/chrome/test/data/extensions/platform_apps/web_view_isolation/storage.js b/chrome/test/data/extensions/platform_apps/web_view_isolation/storage.js
new file mode 100644
index 0000000000000000000000000000000000000000..a9bc99e55f8851b4e01ffb25e651bd9de3a2dbc5
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+++ b/chrome/test/data/extensions/platform_apps/web_view_isolation/storage.js
@@ -0,0 +1,86 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This method initializes the two types of DOM storage.
+function initDomStorage(value) {
+  window.localStorage.setItem('foo', 'local-' + value);
+  window.sessionStorage.setItem('bar', 'session-' + value);
+}
+
+// The code below is used for testing IndexedDB isolation.
+// The test uses three basic operations -- open, read, write -- to verify proper
+// isolation across webview tags with different storage partitions.
+// Each of the basic functions below sets document.title to a specific text,
+// which the main browser test is waiting for. This is needed because all
+// the functions get their results through callbacks and cannot return the
+// values directly.
+var isolation = {};
+window.indexedDB = window.indexedDB || window.webkitIndexedDB;
+
+isolation.db = null;
+isolation.onerror = function(e) {
+  document.title = "error";
+};
+
+// This method opens the database and creates the objectStore if it doesn't
+// exist. It sets the document.title to a string referring to which
+// operation has been performed - open vs create.
+function initIDB() {
+  var request = indexedDB.open("isolation");
+  request.onsuccess = function(e) {
+    var v = 3;
+    isolation.db = e.target.result;
+    if (v != isolation.db.version) {
+      var setVrequest = isolation.db.setVersion(v);
+      setVrequest.onerror = isolation.onerror;
+      setVrequest.onsuccess = function(e) {
+        var store = isolation.db.createObjectStore(
+            "partitions", {keyPath: "id"});
+        e.target.transaction.oncomplete = function() {
+          document.title = "idb created";
+        }
+      };
+    } else {
+      document.title = "idb open";
+    }
+  };
+  request.onerror = isolation.onerror;
+}
+
+// This method adds a |value| to the database identified by |id|.
+function addItemIDB(id, value) {
+  var trans = isolation.db.transaction(["partitions"], "readwrite");
+  var store = trans.objectStore("partitions");
+  var data = { "partition": value, "id": id };
+
+  var request = store.put(data);
+  request.onsuccess = function(e) {
+    document.title = "addItemIDB complete";
+  };
+  request.onerror = isolation.onerror;
+};
+
+var storedValue = null;
+
+// This method reads an item from the database, identified by |id|. Since
+// the value cannot be returned directly, it is saved into the global
+// "storedValue" variable, which is then read through getValueIDB().
+function readItemIDB(id) {
+  storedValue = null;
+  var trans = isolation.db.transaction(["partitions"], "readwrite");
+  var store = trans.objectStore("partitions");
+
+  var request = store.get(id);
+  request.onsuccess = function(e) {
+    if (!!e.target.result != false) {
+      storedValue = request.result.partition;
+    }
+    document.title = "readItemIDB complete";
+  };
+  request.onerror = isolation.onerror;
+}
+
+function getValueIDB() {
+  return storedValue;
+}