Revert "Remove some polyfills"

This reverts commit 64644b57e3.

app/capabilities.js

@@ -45,7 +45,13 @@ async function checkCrypto() {
     );
     return true;
   } catch (err) {
-    return false;
+    try {
+      window.asmCrypto = await import('asmcrypto.js');
+      await import('@dannycoates/webcrypto-liner/build/shim');
+      return true;
+    } catch (e) {
+      return false;
+    }
   }
 }
 
@@ -60,12 +66,25 @@ function checkStreams() {
   }
 }
 
+async function polyfillStreams() {
+  try {
+    await import('@mattiasbuelens/web-streams-polyfill');
+    return true;
+  } catch (e) {
+    return false;
+  }
+}
+
 export default async function getCapabilities() {
   const browser = browserName();
   const isMobile = /mobi|android/i.test(navigator.userAgent);
   const serviceWorker = 'serviceWorker' in navigator && browser !== 'edge';
   let crypto = await checkCrypto();
   const nativeStreams = checkStreams();
+  let polyStreams = false;
+  if (!nativeStreams) {
+    polyStreams = await polyfillStreams();
+  }
   let account = typeof AUTH_CONFIG !== 'undefined';
   try {
     account = account && !!localStorage;
@@ -87,10 +106,10 @@ export default async function getCapabilities() {
     account,
     crypto,
     serviceWorker,
-    streamUpload: nativeStreams,
+    streamUpload: nativeStreams || polyStreams,
     streamDownload:
       nativeStreams && serviceWorker && browser !== 'safari' && !mobileFirefox,
-    multifile: nativeStreams,
+    multifile: nativeStreams || polyStreams,
     share,
     standalone
   };