Added TodoMVC startup benchmarks.

samples/third_party/todomvc_performance/js_todomvc/app/app.css

+/* base.css overrides */
+
+html,
+body {
+        margin: 0;
+        padding: 0;
+}
+
+body {
+        font: 14px 'Helvetica Neue', Helvetica, Arial, sans-serif;
+        line-height: 1.4em;
+        background: #eaeaea url('../components/todomvc-common/bg.png');
+        color: #4d4d4d;
+        width: 550px;
+        margin: 0 auto;
+        -webkit-font-smoothing: antialiased;
+        -moz-font-smoothing: antialiased;
+        -ms-font-smoothing: antialiased;
+        -o-font-smoothing: antialiased;
+        font-smoothing: antialiased;
+}
+
+body > header {
+  padding-top: 22px;
+  margin-bottom: -5px;
+}
+
+h1 {
+  /*    position: absolute;
+        top: -120px;*/
+        width: 100%;
+        font-size: 70px;
+        font-weight: bold;
+        text-align: center;
+        color: #b3b3b3;
+        color: rgba(255, 255, 255, 0.3);
+        text-shadow: -1px -1px rgba(0, 0, 0, 0.2);
+        -webkit-text-rendering: optimizeLegibility;
+        -moz-text-rendering: optimizeLegibility;
+        -ms-text-rendering: optimizeLegibility;
+        -o-text-rendering: optimizeLegibility;
+        text-rendering: optimizeLegibility;
+}
+
+#info {
+        margin: 65px auto 0;
+        color: #a6a6a6;
+        font-size: 12px;
+        text-shadow: 0 1px 0 rgba(255, 255, 255, 0.7);
+        text-align: center;
+}
+
+#info a {
+        color: inherit;
+}
+
+.hidden{
+        display:none;
+}
+
+hr {
+        margin: 20px 0;
+        border: 0;
+        border-top: 1px dashed #C5C5C5;
+        border-bottom: 1px dashed #F7F7F7;
+}
+
+.learn a {
+        font-weight: normal;
+        text-decoration: none;
+        color: #b83f45;
+}
+
+.learn a:hover {
+        text-decoration: underline;
+        color: #787e7e;
+}
+
+.learn h3,
+.learn h4,
+.learn h5 {
+        margin: 10px 0;
+        font-weight: 500;
+        line-height: 1.2;
+        color: #000;
+}
+
+.learn h3 {
+        font-size: 24px;
+}
+
+.learn h4 {
+        font-size: 18px;
+}
+
+.learn h5 {
+        margin-bottom: 0;
+        font-size: 14px;
+}
+
+.learn ul {
+        padding: 0;
+        margin: 0 0 30px 25px;
+}
+
+.learn li {
+        line-height: 20px;
+}
+
+.learn p {
+        font-size: 15px;
+        font-weight: 300;
+        line-height: 1.3;
+        margin-top: 0;
+        margin-bottom: 0;
+}
+
+.quote {
+        border: none;
+        margin: 20px 0 60px 0;
+}
+
+.quote p {
+        font-style: italic;
+}
+
+.quote p:before {
+        content: '“';
+        font-size: 50px;
+        opacity: .15;
+        position: absolute;
+        top: -20px;
+        left: 3px;
+}
+
+.quote p:after {
+        content: '”';
+        font-size: 50px;
+        opacity: .15;
+        position: absolute;
+        bottom: -42px;
+        right: 3px;
+}
+
+.quote footer {
+        position: absolute;
+        bottom: -40px;
+        right: 0;
+}
+
+.quote footer img {
+        border-radius: 3px;
+}
+
+.quote footer a {
+        margin-left: 5px;
+        vertical-align: middle;
+}
+
+.speech-bubble {
+        position: relative;
+        padding: 10px;
+        background: rgba(0, 0, 0, .04);
+        border-radius: 5px;
+}
+
+.speech-bubble:after {
+        content: '';
+        position: absolute;
+        top: 100%;
+        right: 30px;
+        border: 13px solid transparent;
+        border-top-color: rgba(0, 0, 0, .04);
+}
+
+/**body*/.learn-bar > .learn {
+        position: absolute;
+        width: 272px;
+        top: 8px;
+        left: -300px;
+        padding: 10px;
+        border-radius: 5px;
+        background-color: rgba(255, 255, 255, .6);
+        transition-property: left;
+        transition-duration: 500ms;
+}
+
+
+/* IE doesn't support the hidden attribute */
+[hidden] {
+        display: none;
+}
+
+@media (min-width: 899px) {
+        /**body*/.learn-bar {
+                width: auto;
+                margin: 0 0 0 300px;
+        }
+        /**body*/.learn-bar > .learn {
+                left: 8px;
+        }
+        /**body*/.learn-bar #todoapp {
+                width: 550px;
+                margin: 130px auto 40px auto;
+        }
+}