Touch Events capability negotiation

remoting/webapp/crd/js/client_session.js

Index: remoting/webapp/crd/js/client_session.js
diff --git a/remoting/webapp/crd/js/client_session.js b/remoting/webapp/crd/js/client_session.js
index 0bb20cb674c12accc9598674044652370a83e10d..943b7a18997164fea62f1f54b87b6f0152351ce4 100644
--- a/remoting/webapp/crd/js/client_session.js
+++ b/remoting/webapp/crd/js/client_session.js
@@ -207,6 +207,11 @@ remoting.ClientSession.Capability = {
   // <1000 users on M-29 or below. Remove this and the capability on the host.
   RATE_LIMIT_RESIZE_REQUESTS: 'rateLimitResizeRequests',
 
+  // Indicates native touch input support. If the host does not support
+  // touch then the client will let Chrome synthesize mouse events from touch
+  // input, for compatibility with non-touch-aware systems.
+  TOUCH_EVENTS: 'touchEvents',
+
   // Indicates that host/client supports Google Drive integration, and that the
   // client should send to the host the OAuth tokens to be used by Google Drive
   // on the host.
@@ -465,6 +470,9 @@ remoting.ClientSession.prototype.onSetCapabilities = function(capabilities) {
   if (this.hasCapability(remoting.ClientSession.Capability.GOOGLE_DRIVE)) {
     this.sendGoogleDriveAccessToken_();
   }
+  if (this.hasCapability(remoting.ClientSession.Capability.TOUCH_EVENTS)) {
+    this.plugin_.enableTouchEvents(true);
+  }
 };
 
 /**
@@ -602,4 +610,3 @@ remoting.ClientSession.prototype.sendGoogleDriveAccessToken_ = function() {
   window.setTimeout(this.sendGoogleDriveAccessToken_.bind(this),
                     remoting.ACCESS_TOKEN_RESEND_INTERVAL_MS);
 };
-