Initial skeleton for System Indicator API

chrome/test/data/extensions/api_test/system_indicator/test.js

+// Copyright (c) 2010 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.
+
+// Idle api test for Chrome.

[dcheng, 2012/11/13 00:52:19]

This comment should probably be updated =)

[dewittj, 2012/11/13 06:58:54]

Done

+// browser_tests.exe --gtest_filter=ExtensionApiTest.SystemIndicator
+
+// Due to the fact that browser tests are run in many different environments it
+// is not simple to be able to set the user input value before testing.  For
+// these bvts we have chosen the minimal consistent tests.
+
+chrome.test.runTests([
+  function showAndHideNonexistentIcon() {
+    // Hide before show, just in case
+    chrome.experimental.systemIndicator.hide();
+    chrome.experimental.systemIndicator.show();
+    chrome.experimental.systemIndicator.hide();
+    chrome.test.succeed();
+  },
+  function setUrl() {
+    // Success in showing the icon?
+    chrome.experimental.systemIndicator.setURL('128.png');
+    chrome.test.succeed();
+  },
+  function setImageData() {
+    // create an image, turn it into a canvas, then set the icon.
+    var img = new Image(),
+        path = '128.png';

[dcheng, 2012/11/13 00:52:19]

Nit: I'd probably just say var path = here as well. It's much more common to see
one variable declaration per statement.

[dewittj, 2012/11/13 06:58:54]

I've found that in JS, the "single var statement at the top of each scope" idiom
is prevalent, since block scoping doesn't exist.  I'm removing the dependency on
128.png anyway, so no issue here.

+    img.onerror = function() {
+      console.error('Could not load icon \'' + path + '\'.');
+      chrome.test.fail();
+    };
+    img.onload = function() {
+      var canvas = document.createElement('canvas');
+      canvas.width = img.width;
+      canvas.height = img.height;
+
+      var canvas_context = canvas.getContext('2d');
+      canvas_context.clearRect(0, 0, canvas.width, canvas.height);
+      canvas_context.drawImage(img, 0, 0, canvas.width, canvas.height);
+      var imageData = canvas_context.getImageData(0, 0, canvas.width,
+                                                  canvas.height);
+      chrome.experimental.systemIndicator.setImageData(imageData);
+      chrome.test.succeed();
+    };
+    img.src = path;
+  }
+]);