Added Chrome screensharing extension.

extensions/README.md

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+This folder contains screensharing extensions for various browsers.

extensions/chrome/README.md

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+# Screensharing utility for the Nextcloud video calls app
+
+Based on the getScreenMedia example from
+https://github.com/HenrikJoreteg/getScreenMedia/tree/master/chrome-extension-sample
+
+Make sure to replace `replace-with-your-hostname` with your actual hostname
+in `manifest.json` before installing the extension.

extensions/chrome/background.js

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+/* global chrome */
+
+(function() {
+
+    /* background page, responsible for actually choosing media */
+    chrome.runtime.onMessageExternal.addListener(function (message, sender, callback) {
+        switch(message.type) {
+            case 'getScreen':
+                chrome.desktopCapture.chooseDesktopMedia(message.options || ['screen', 'window'],
+                                                         sender.tab, function (streamid) {
+                    // communicate this string to the app so it can call getUserMedia with it
+                    message.type = 'gotScreen';
+                    message.sourceId = streamid;
+                    callback(message);
+                    return false;
+                });
+                return true; // retain callback for chooseDesktopMedia result
+            case 'cancelGetScreen':
+                chrome.desktopCapture.cancelChooseDesktopMedia(message.request);
+                message.type = 'canceledGetScreen';
+                callback(message);
+                return false; //dispose callback
+        }
+    });
+
+})();

extensions/chrome/content.js

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+/* global chrome */
+
+(function() {
+
+    sessionStorage.getScreenMediaJSExtensionId = chrome.runtime.id;
+
+})();

extensions/chrome/manifest.json

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+{
+  "name": "Nextcloud Screensharing",
+  "description": "Screensharing utility for the Nextcloud video calls app.",
+  "version": "0.0.1",
+  "manifest_version": 2,
+  "minimum_chrome_version": "34",
+  "icons": {
+  },
+  "permissions": [
+    "desktopCapture"
+  ],
+  "background": {
+    "scripts": ["background.js"]
+  },
+  "content_scripts": [ {
+    "js": [ "content.js" ],
+    "matches": [ "https://replace-with-your-hostname/*" ]
+  }],
+  "externally_connectable": {
+      "matches": [
+          "https://replace-with-your-hostname/*"
+      ]
+  }
+}