[Media Router] Adds a pre-invocation hook to Media Router bindings.

extensions/renderer/resources/media_router_bindings.js

Index: extensions/renderer/resources/media_router_bindings.js
diff --git a/extensions/renderer/resources/media_router_bindings.js b/extensions/renderer/resources/media_router_bindings.js
index dd1ffdec7f53143fc6642ab31dd8f13f582eadd9..5f0d9a0a824f59254b49332b6eb0c2b39469bccf 100644
--- a/extensions/renderer/resources/media_router_bindings.js
+++ b/extensions/renderer/resources/media_router_bindings.js
@@ -545,6 +545,10 @@ define('media_router_bindings', [
    * @param {!MediaRouterHandlers} handlers
    */
   MediaRouteProvider.prototype.setHandlers = function(handlers) {
+    // TODO(mfoltz): Remove when component that supports this method is
+    // rolled out to all Chrome channels in M56.
+    if (!handlers['onBeforeInvokeHandler'])
+      handlers['onBeforeInvokeHandler'] = () => {};
     this.handlers_ = handlers;
     var requiredHandlers = [
       'stopObservingMediaRoutes',
@@ -563,6 +567,7 @@ define('media_router_bindings', [
       'enableMdnsDiscovery',
       'updateMediaSinks',
       'searchSinks',
+      'onBeforeInvokeHandler'
     ];
     requiredHandlers.forEach(function(nextHandler) {
       if (handlers[nextHandler] === undefined) {
@@ -579,6 +584,7 @@ define('media_router_bindings', [
    */
   MediaRouteProvider.prototype.startObservingMediaSinks =
       function(sourceUrn) {
+    this.handlers_.onBeforeInvokeHandler();
     this.handlers_.startObservingMediaSinks(sourceUrn);
   };
 
@@ -588,6 +594,7 @@ define('media_router_bindings', [
    */
   MediaRouteProvider.prototype.stopObservingMediaSinks =
       function(sourceUrn) {
+    this.handlers_.onBeforeInvokeHandler();
     this.handlers_.stopObservingMediaSinks(sourceUrn);
   };
 
@@ -611,7 +618,8 @@ define('media_router_bindings', [
    */
   MediaRouteProvider.prototype.createRoute =
       function(sourceUrn, sinkId, presentationId, origin, tabId,
-          timeout, incognito) {
+               timeout, incognito) {
+    this.handlers_.onBeforeInvokeHandler();
     return this.handlers_.createRoute(
         sourceUrn, sinkId, presentationId, origin, tabId,
         Math.floor(timeout.microseconds / 1000), incognito)
@@ -642,6 +650,7 @@ define('media_router_bindings', [
   MediaRouteProvider.prototype.joinRoute =
       function(sourceUrn, presentationId, origin, tabId, timeout,
                incognito) {
+    this.handlers_.onBeforeInvokeHandler();
     return this.handlers_.joinRoute(
         sourceUrn, presentationId, origin, tabId,
         Math.floor(timeout.microseconds / 1000), incognito)
@@ -673,6 +682,7 @@ define('media_router_bindings', [
   MediaRouteProvider.prototype.connectRouteByRouteId =
       function(sourceUrn, routeId, presentationId, origin, tabId,
                timeout, incognito) {
+    this.handlers_.onBeforeInvokeHandler();
     return this.handlers_.connectRouteByRouteId(
         sourceUrn, routeId, presentationId, origin, tabId,
         Math.floor(timeout.microseconds / 1000), incognito)
@@ -692,6 +702,7 @@ define('media_router_bindings', [
    *    message and code if the operation failed.
    */
   MediaRouteProvider.prototype.terminateRoute = function(routeId) {
+    this.handlers_.onBeforeInvokeHandler();
     // TODO(crbug.com/627967): Remove code path that doesn't expect a Promise
     // in M56.
     var maybePromise = this.handlers_.terminateRoute(routeId);
@@ -716,7 +727,8 @@ define('media_router_bindings', [
    *    or false on failure.
    */
   MediaRouteProvider.prototype.sendRouteMessage = function(
-      routeId, message) {
+    routeId, message) {
+    this.handlers_.onBeforeInvokeHandler();
     return this.handlers_.sendRouteMessage(routeId, message)
         .then(function() {
           return {'sent': true};
@@ -733,7 +745,8 @@ define('media_router_bindings', [
    *    or false on failure.
    */
   MediaRouteProvider.prototype.sendRouteBinaryMessage = function(
-      routeId, data) {
+    routeId, data) {
+    this.handlers_.onBeforeInvokeHandler();
     return this.handlers_.sendRouteBinaryMessage(routeId, data)
         .then(function() {
           return {'sent': true};
@@ -748,6 +761,7 @@ define('media_router_bindings', [
    */
   MediaRouteProvider.prototype.startListeningForRouteMessages = function(
       routeId) {
+    this.handlers_.onBeforeInvokeHandler();
     if (this.handlers_.startListeningForRouteMessages) {
       this.handlers_.startListeningForRouteMessages(routeId);
     } else {
@@ -763,6 +777,7 @@ define('media_router_bindings', [
    * @param {!string} routeId
    */
   MediaRouteProvider.prototype.listenForRouteMessagesOld = function(routeId) {
+    this.handlers_.onBeforeInvokeHandler();
     this.handlers_.listenForRouteMessages(routeId)
         .then(function(messages) {
           // If messages is empty, then stopListeningForRouteMessages has been
@@ -783,6 +798,7 @@ define('media_router_bindings', [
    */
   MediaRouteProvider.prototype.stopListeningForRouteMessages = function(
       routeId) {
+    this.handlers_.onBeforeInvokeHandler();
     this.handlers_.stopListeningForRouteMessages(routeId);
   };
 
@@ -802,6 +818,7 @@ define('media_router_bindings', [
    * @param {!string} sourceUrn
    */
   MediaRouteProvider.prototype.startObservingMediaRoutes = function(sourceUrn) {
+    this.handlers_.onBeforeInvokeHandler();
     this.handlers_.startObservingMediaRoutes(sourceUrn);
   };
 
@@ -811,6 +828,7 @@ define('media_router_bindings', [
    * @param {!string} sourceUrn
    */
   MediaRouteProvider.prototype.stopObservingMediaRoutes = function(sourceUrn) {
+    this.handlers_.onBeforeInvokeHandler();
     this.handlers_.stopObservingMediaRoutes(sourceUrn);
   };
 
@@ -818,6 +836,7 @@ define('media_router_bindings', [
    * Enables mDNS device discovery.
    */
   MediaRouteProvider.prototype.enableMdnsDiscovery = function() {
+    this.handlers_.onBeforeInvokeHandler();
     this.handlers_.enableMdnsDiscovery();
   };
 
@@ -826,6 +845,7 @@ define('media_router_bindings', [
    * @param {!string} sourceUrn
    */
   MediaRouteProvider.prototype.updateMediaSinks = function(sourceUrn) {
+    this.handlers_.onBeforeInvokeHandler();
     this.handlers_.updateMediaSinks(sourceUrn);
   };
 
@@ -850,6 +870,7 @@ define('media_router_bindings', [
     if (!this.handlers_.searchSinks) {
       return Promise.resolve({'sink_id': ''});
     }
+    this.handlers_.onBeforeInvokeHandler();
     return Promise.resolve({
       'sink_id': this.handlers_.searchSinks(sinkId, sourceUrn, searchCriteria)
     });
@@ -861,4 +882,3 @@ define('media_router_bindings', [
 
   return mediaRouter;
 });
-