diff --git a/.gitmodules b/.gitmodules
index fca120b..3c46120 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "benchmark/chartjs"]
 	path = benchmark/chartjs
 	url = https://github.com/nnnick/Chart.js.git
+[submodule "tools"]
+	path = tools
+	url = https://github.com/Polymer/tools.git
diff --git a/conf/karma.conf.js b/conf/karma.conf.js
index 7245d1b..fcf85d1 100644
--- a/conf/karma.conf.js
+++ b/conf/karma.conf.js
@@ -1,5 +1,6 @@
 module.exports = function(karma) {
-  karma.set({
+  var common = require('../tools/test/karma-common.conf.js');
+  karma.set(common.mixin_common_opts(karma, {
     // base path, that will be used to resolve files and exclude
     basePath: '../',
 
@@ -17,69 +18,5 @@ module.exports = function(karma) {
       'tests/d8_array_fuzzer.js',
       'tests/d8_planner_test.js'
     ],
-
-    frameworks: ['mocha'],
-
-    // use dots reporter, as travis terminal does not support escaping sequences
-    // possible values: 'dots', 'progress', 'junit', 'teamcity'
-    // CLI --reporters progress
-    reporters: ['progress'],
-
-    // web server port
-    // CLI --port 9876
-    port: 9876,
-
-    // cli runner port
-    // CLI --runner-port 9100
-    runnerPort: 9100,
-
-    // enable / disable colors in the output (reporters and logs)
-    // CLI --colors --no-colors
-    colors: true,
-
-    // level of logging
-    // possible values: LOG_DISABLE || LOG_ERROR || LOG_WARN || LOG_INFO || LOG_DEBUG
-    // CLI --log-level debug
-    logLevel: karma.LOG_INFO,
-
-    // enable / disable watching file and executing tests whenever any file changes
-    // CLI --auto-watch --no-auto-watch
-    autoWatch: true,
-
-    // Start these browsers, currently available:
-    // - Chrome
-    // - ChromeCanary
-    // - Firefox
-    // - Opera
-    // - Safari (only Mac)
-    // - PhantomJS
-    // - IE (only Windows)
-    // CLI --browsers Chrome,Firefox,Safari
-    browsers: ['ChromeCanary'],
-
-    // If browser does not capture in given timeout [ms], kill it
-    // CLI --capture-timeout 5000
-    captureTimeout: 50000,
-
-    // Auto run tests on start (when browsers are captured) and exit
-    // CLI --single-run --no-single-run
-    singleRun: true,
-
-    // report which specs are slower than 500ms
-    // CLI --report-slower-than 500
-    reportSlowerThan: 500,
-
-    // compile coffee scripts
-    preprocessors: {
-    },
-
-    plugins: [
-      'karma-mocha',
-      'karma-chrome-launcher',
-      'karma-firefox-launcher',
-      'karma-ie-launcher',
-      'karma-script-launcher',
-      'karma-crbot-reporter'
-    ]
-  });
+  }));
 };
diff --git a/gruntfile.js b/gruntfile.js
index 1fb3a35..c09bccd 100644
--- a/gruntfile.js
+++ b/gruntfile.js
@@ -13,28 +13,6 @@
 // limitations under the License.
 
 module.exports = function(grunt) {
-
-  // karma setup
-  var browsers;
-  (function() {
-    try {
-      var config = grunt.file.readJSON('local.json');
-      if (config.browsers) {
-        browsers = config.browsers;
-      }
-    } catch (e) {
-      var os = require('os');
-      browsers = ['Chrome', 'Firefox'];
-      //browsers = ['Chrome'];
-      if (os.type() === 'Darwin') {
-        browsers.push('ChromeCanary');
-      }
-      if (os.type() === 'Windows_NT') {
-        browsers.push('IE');
-      }
-    }
-  })();
-
   grunt.initConfig({
     karma: {
       options: {
@@ -42,12 +20,10 @@ module.exports = function(grunt) {
         keepalive: true
       },
       buildbot: {
-        browsers: browsers,
         reporters: ['crbot'],
         logLevel: 'OFF'
       },
       'observe-js': {
-        browsers: browsers
       }
     }
   });
diff --git a/package.json b/package.json
index 6cc639f..07399bc 100644
--- a/package.json
+++ b/package.json
@@ -25,6 +25,7 @@
     "grunt-karma": "*",
     "karma-mocha": "*",
     "karma-ie-launcher": "*",
+    "karma-safari-launcher": "*",
     "karma-script-launcher": "*",
     "karma-crbot-reporter": "*"
   }
diff --git a/tools b/tools
new file mode 160000
index 0000000..93f21ac
--- /dev/null
+++ b/tools
@@ -0,0 +1 @@
+Subproject commit 93f21ac3de9e71e054a8d4875a5d77852f4f769d