Implement chrome.brailleDisplayPrivate API

chrome/test/data/extensions/api_test/braille_display_private/write_dots/test.js

Index: chrome/test/data/extensions/api_test/braille_display_private/write_dots/test.js
diff --git a/chrome/test/data/extensions/api_test/braille_display_private/write_dots/test.js b/chrome/test/data/extensions/api_test/braille_display_private/write_dots/test.js
new file mode 100644
index 0000000000000000000000000000000000000000..ba4fc6d844d76250048aa57c0e50de9adf1f0cf0
--- /dev/null
+++ b/chrome/test/data/extensions/api_test/braille_display_private/write_dots/test.js
@@ -0,0 +1,41 @@
+// Copyright (c) 2013 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.
+
+// Test for brailleDisplayPrivate.writeDots.
+// browser_tests.exe --gtest_filter="BrailleDisplayPrivateApiTest.*"
+
+var pass = chrome.test.callbackPass;
+
+function createBuffer(size, element) {
+  var buf = new Uint8Array(size);
+  for (var i = 0; i < size; ++i) {
+    buf[i] = element;
+  }
+  return buf.buffer;
+}
+
+chrome.test.runTests([
+  function testWriteEmptyCells() {
+    chrome.brailleDisplayPrivate.getDisplayState(pass(
+        function(state) {
+          chrome.test.assertTrue(state.available, "Display not available");
+          chrome.test.assertEq(11, state.textCellCount);
+          chrome.brailleDisplayPrivate.writeDots(new ArrayBuffer(0));
+          chrome.brailleDisplayPrivate.getDisplayState(pass());
+        }));
+  },
+
+  function testWriteOversizedCells() {
+    chrome.brailleDisplayPrivate.getDisplayState(pass(
+        function(state) {
+          chrome.test.assertTrue(state.available, "Display not available");
+          chrome.test.assertEq(11, state.textCellCount);
+          chrome.brailleDisplayPrivate.writeDots(
+              createBuffer(state.textCellCount + 1, 1));
+          chrome.brailleDisplayPrivate.writeDots(
+              createBuffer(1000000, 2));
+          chrome.brailleDisplayPrivate.getDisplayState(pass());
+        }));
+  }
+]);