Show a notification when an ephemeral app consumes excessive disk space

chrome/test/data/extensions/storage_monitor/write_data/index.js

+// Copyright 2014 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.
+
+var kHundredChars = '';
+var kTestFileName = 'test.txt';
+
+for (var i = 0; i < 10; i++) {
+  kHundredChars += '0123456789';
+}
+
+function FileSystemWriteError() {
+  chrome.test.fail('Filesystem write error');
+}
+
+// Appends 50 bytes of data to the file.
+function AppendDataToFile(fileEntry, numChars) {
+  fileEntry.createWriter(function(fileWriter) {
+
+    fileWriter.onwriteend = function(e) {
+      chrome.test.sendMessage('write_complete', null);
+      chrome.test.succeed();
+      chrome.app.window.current().close();
+    };
+
+    fileWriter.onerror = function(e) {
+      FileSystemWriteError();
+    };
+
+    fileWriter.seek(fileWriter.length);
+    var str = '';
+
+    // Avoid many loops for large data packets.
+    var iterations = Math.floor(numChars / 100);
+    for (var i = 0; i < iterations; ++i) {
+      str += kHundredChars;
+    }
+
+    iterations = numChars % 100;
+    for (var i = 0; i < iterations; ++i) {
+      str += 'a';
+    }
+
+    var blob = new Blob([str], {type: 'text/plain'});
+    fileWriter.write(blob);
+  });
+}
+
+function WriteData(numChars) {
+  window.webkitRequestFileSystem(
+      PERSISTENT,
+      16384,
+      function(fs) {
+        fs.root.getFile(
+            kTestFileName,
+            {create: true},
+            function(fileEntry) {
+              AppendDataToFile(fileEntry, numChars);
+            },
+            FileSystemWriteError);
+      }, FileSystemWriteError);
+}
+
+onload = function() {
+  chrome.test.sendMessage('launched', function(reply) {
+    var numChars = parseInt(reply);
+    if (isNaN(numChars)) {
+      chrome.test.fail('Expected number of chars from browser');
+      return;
+    }
+
+    WriteData(numChars);
+  });
+};