Add group to sidebar whitelist

src/sidebar/host-config.js

@@ -17,6 +17,9 @@ function hostPageConfig(window) {
     // Direct-linked annotation ID
     'annotations',
 
+    // Direct-linked group ID
+    'group',
+
     // Default query passed by url
     'query',
 

src/sidebar/test/host-config-test.js

@@ -14,6 +14,7 @@ describe('hostPageConfig', function() {
   it('parses config from location string and returns whitelisted params', function() {
     const window_ = fakeWindow({
       annotations: '1234',
+      group: 'abc12',
       appType: 'bookmarklet',
       openSidebar: true,
       requestConfigFromFrame: 'https://embedder.com',
@@ -27,6 +28,7 @@ describe('hostPageConfig', function() {
 
     assert.deepEqual(hostPageConfig(window_), {
       annotations: '1234',
+      group: 'abc12',
       appType: 'bookmarklet',
       openSidebar: true,
       requestConfigFromFrame: 'https://embedder.com',