<webview>: Add JavaScript test for IndexedDB isolation.

chrome/test/data/extensions/platform_apps/web_view/isolation_indexeddb/storage.js

Index: chrome/test/data/extensions/platform_apps/web_view/isolation_indexeddb/storage.js
diff --git a/chrome/test/data/extensions/platform_apps/web_view/isolation_indexeddb/storage.js b/chrome/test/data/extensions/platform_apps/web_view/isolation_indexeddb/storage.js
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+// Copyright 2015 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 sends a postMessage to the embedder with
+// the results.
+var isolation = {};
+
+isolation.db = null;
+isolation.onerror = function(e) {
+  sendResponse('error');
+};
+
+// Used to send postMessage to the embedder.
+var channel = null;
+// Id that the embedder uses to identify this guest.
+var id = -1;
+
+// This method opens the database and creates the objectStore if it doesn't
+// exist. It sends a postMessage to the embedder with a string referring to
+// which operation has been performed - open vs create.
+function initIDB() {
+  var v = 3;
+  var ranVersionChangeTransaction = false;
+  var request = indexedDB.open('isolation', v);
+  request.onupgradeneeded = function(e) {
+    isolation.db = e.target.result;
+    var store = isolation.db.createObjectStore(
+        'partitions', {keyPath: "id"});
+    e.target.transaction.oncomplete = function() {
+      ranVersionChangeTransaction = true;
+    };
+  }
+  request.onsuccess = function(e) {
+    isolation.db = e.target.result;
+    if (ranVersionChangeTransaction) {
+      sendResponse('idb created');
+    } else {
+      sendResponse('idb open');
+    }
+  };
+  request.onerror = isolation.onerror;
+  request.onblocked = 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) {
+    sendResponse('addItemIDB complete');
+  };
+  request.onerror = isolation.onerror;
+};
+
+// This method reads an item from the database, and returns the result
+// to the embedder using postMessage.
+function readItemIDB(id) {
+  var 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;
+    }
+    sendResponse('readItemIDB: ' + storedValue);
+  };
+  request.onerror = isolation.onerror;
+}
+
+function openIDB(name) {
+  var request = indexedDB.open('isolation');
+  request.onsuccess = function(e) {
+    e.target.result.version == 1 ? sendResponse('db not found')
+                                 : sendResponse('db found');
+  };
+  request.onerror = isolation.onerror;
+  request.onblocked = isolation.onerror;
+}
+
+function sendResponse(responseStr) {
+  if (channel) {
+    channel.postMessage(JSON.stringify([id, responseStr]), '*');
+  }
+}
+
+window.onmessage = function(e) {
+  if (!channel) {
+    channel = e.source;
+  }
+
+  var data = JSON.parse(e.data);
+  id = data.id;
+  window.console.log('onmessage: ' + data.name);
+  switch (data.name) {
+    case 'init':
+      initIDB();
+      break;
+    case 'add':
+      addItemIDB(data.params[0], data.params[1]);
+      break;
+    case 'read':
+      readItemIDB(data.params[0]);
+      break;
+    case 'open':
+      openIDB(data.params[0]);
+      break;
+    default:
+      sendResponse('bogus-command');  // Error.
+      break;
+  }
+};