update perf rnn demo

demos/demo-header.html

@@ -30,7 +30,8 @@
 <template>
 <header class="mdl-layout__header mdl-layout--fixed-header is-casting-shadow">
   <script>
-    if (location.protocol !== "https:") {
+    if (location.protocol !== "https:" &&
+        location.hostname === 'deeplearnjs.org') {
       location.protocol = "https:";
     }
   </script>

demos/homepage/_includes/header.html

@@ -1,7 +1,8 @@
 <!-- Header -->
 <header class="mdl-layout__header mdl-layout--fixed-header">
   <script>
-    if (location.protocol !== "https:") {
+    if (location.protocol !== "https:" &&
+        location.hostname === 'deeplearnjs.org') {
       location.protocol = "https:";
     }
   </script>

demos/homepage/index.ts

@@ -15,47 +15,14 @@
  * =============================================================================
  */
 
-import {NDArrayMathGPU} from '../deeplearn';
 import {ActivationFunction, ColorMode, CPPN} from '../nn-art/cppn';
-
-function isSafari() {
-  const ua = navigator.userAgent.toLowerCase();
-  if (ua.indexOf('safari') !== -1) {
-    if (ua.indexOf('chrome') > -1) {
-      return false;
-    } else {
-      return true;
-    }
-  }
-  return false;
-}
-function isMobile() {
-  // tslint:disable-next-line:no-any
-  const a = navigator.userAgent || navigator.vendor || (window as any).opera;
-  // tslint:disable-next-line:max-line-length
-  return /(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino/i
-             .test(a) ||
-      // tslint:disable-next-line:max-line-length
-      /1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i
-          .test(a.substr(0, 4));
-}
+import * as demo_util from '../util';
 
 const inferenceCanvas =
     document.querySelector('#inference') as HTMLCanvasElement;
 
-let enableCPPN = false;
-
-try {
-  const math = new NDArrayMathGPU();
-  enableCPPN = true;
-  math.dispose();
-} catch (e) {
-  enableCPPN = false;
-}
-
-const isDeviceDisabled = isSafari() && isMobile();
-
-enableCPPN = enableCPPN && !isDeviceDisabled;
+const isDeviceDisabled = demo_util.isSafari() && demo_util.isMobile();
+const enableCPPN = demo_util.isWebGLSupported() && !isDeviceDisabled;
 
 if (enableCPPN) {
   startCPPN();