Revert 127833 - Re-land alexbost's experimental offscreenTabs API.

chrome/test/data/extensions/api_test/offscreen_tabs/display.js

-// 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.
-
-var testTabs = [
-    { url: 'a.html', width: 200, height: 200 },
-    { url: 'b.html', width: 200, height: 200 }
-];
-
-var firstTabId;
-var secondTabId;
-var firstTabDataURL;
-var secondTabDataURL;
-
-var DATA_URL_PREFIX = 'data:image/png;base64,';
-
-chrome.test.runTests([
-  function createFirstTab() {
-    chrome.test.listenOnce(
-        chrome.experimental.offscreenTabs.onUpdated,
-        function(tabId, changeInfo, tab) {
-      assertSimilarTabs(testTabs[0], tab);
-      firstTabId = tab.id;
-    });
-
-    chrome.experimental.offscreenTabs.create(
-        testTabs[0], pass(function(tab) {
-      assertSimilarTabs(testTabs[0], tab);
-    }));
-  },
-
-  function createSecondTab() {
-    chrome.test.listenOnce(
-        chrome.experimental.offscreenTabs.onUpdated,
-        function(tabId, changeInfo, tab) {
-      assertSimilarTabs(testTabs[1], tab);
-      secondTabId = tab.id;
-    });
-
-    chrome.experimental.offscreenTabs.create(
-        testTabs[1], pass(function(tab) {
-      assertSimilarTabs(testTabs[1], tab);
-    }));
-  },
-
-  // Capture an image of the first tab and verify that the data URL looks
-  // reasonably correct.
-  function captureFirstTab() {
-    chrome.experimental.offscreenTabs.toDataUrl(
-        firstTabId, {format: 'png'}, pass(function(dataURL) {
-      assertEq('string', typeof(dataURL));
-      assertEq(DATA_URL_PREFIX, dataURL.substring(0, DATA_URL_PREFIX.length));
-      firstTabDataURL = dataURL;
-    }));
-  },
-
-  // Capture an image of the second tab and verify that the data URL looks
-  // reasonably correct.
-  function captureSecondTab() {
-    chrome.experimental.offscreenTabs.toDataUrl(
-        secondTabId, {format: 'png'}, pass(function(dataURL) {
-      assertEq('string', typeof(dataURL));
-      assertEq(DATA_URL_PREFIX, dataURL.substring(0, DATA_URL_PREFIX.length));
-      secondTabDataURL = dataURL;
-    }));
-  }
-
-  /*
-  This test does not work on Mac because the API always returns black images.
-
-  // Make sure the data URLs for the two tabs are different, since pages are
-  // different (though the height and widths are equal).
-  function compareCaptures() {
-    assertFalse(firstTabDataURL == secondTabDataURL);
-    chrome.test.succeed();
-  }
-  */
-]);