Fail silently if unable to shim GetUserMedia & AddTrackRemoveTrack & PeerConnection on chrome

Author: Mariusz Bełtowski

.gitignore

@@ -8,3 +8,4 @@ validation-report.json
 validation-status.json
 npm-debug.log
 *~
+.idea

src/js/chrome/chrome_shim.js

@@ -403,6 +403,9 @@ export function shimAddTrackRemoveTrackWithNative(window) {
 }
 
 export function shimAddTrackRemoveTrack(window) {
+  if (!window.RTCPeerConnection) {
+    return;
+  }
   const browserDetails = utils.detectBrowser(window);
   // shim addTrack and removeTrack.
   if (window.RTCPeerConnection.prototype.addTrack &&
@@ -625,6 +628,9 @@ export function shimPeerConnection(window) {
     // very basic support for old versions.
     window.RTCPeerConnection = window.webkitRTCPeerConnection;
   }
+  if (!window.RTCPeerConnection) {
+    return;
+  }
 
   const origGetStats = window.RTCPeerConnection.prototype.getStats;
   window.RTCPeerConnection.prototype.getStats = function(selector,

src/js/chrome/getusermedia.js

@@ -11,9 +11,14 @@ import * as utils from '../utils.js';
 const logging = utils.log;
 
 export function shimGetUserMedia(window) {
-  const browserDetails = utils.detectBrowser(window);
   const navigator = window && window.navigator;
 
+  if (!navigator.mediaDevices) {
+    return;
+  }
+
+  const browserDetails = utils.detectBrowser(window);
+
   const constraintsToChrome_ = function(c) {
     if (typeof c !== 'object' || c.mandatory || c.optional) {
       return c;