[MD History] Disable slow test on Debug/ASAN.

chrome/test/data/webui/md_history/md_history_browsertest.js

 // 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.
 
 /**
  * @fileoverview Test suite for the Material Design history page.
  */
 
 var ROOT_PATH = '../../../../../';
 
@@ skipping 89 matching lines @@
 function MaterialHistoryListTest() {}
 
 MaterialHistoryListTest.prototype = {
   __proto__: MaterialHistoryBrowserTest.prototype,
 
   extraLibraries: MaterialHistoryBrowserTest.prototype.extraLibraries.concat([
     'history_list_test.js',
   ]),
 };
 
-TEST_F('MaterialHistoryListTest', 'All', function() {
+// Times out on debug builders and may time out on memory bots because
+// the History page can take several seconds to load in a Debug build. See
+// https://crbug.com/669227.
+GEN('#if defined(MEMORY_SANITIZER) || !defined(NDEBUG)');
+GEN('#define MAYBE_All DISABLED_All');
+GEN('#else');
+GEN('#define MAYBE_All All');
+GEN('#endif');
+
+TEST_F('MaterialHistoryListTest', 'MAYBE_All', function() {
   mocha.run();
 });
 
 function MaterialHistoryMetricsTest() {}
 
 MaterialHistoryMetricsTest.prototype = {
   __proto__: MaterialHistoryBrowserTest.prototype,
 
   extraLibraries: MaterialHistoryBrowserTest.prototype.extraLibraries.concat([
     'history_metrics_test.js',
@@ skipping 106 matching lines @@
   __proto__: MaterialHistoryBrowserTest.prototype,
 
   extraLibraries: MaterialHistoryBrowserTest.prototype.extraLibraries.concat([
     'history_toolbar_test.js',
   ]),
 };
 
 TEST_F('MaterialHistoryToolbarTest', 'All', function() {
   mocha.run();
 });