chromeos: Add DBus binding for privetd Ping command

Extend PrivetDaemonClient to invoke the "Ping" D-Bus method
on org.chromium.privetd.Manager.

This is connected to the chrome.shell.gcd API for manual
testing, but that will be deleted soon in favor of talking to
privetd as part of Chrome OS OOBE. Manual tests require
adding user chronos to group privetd in /etc/groups until
https://code.google.com/p/brillo/issues/detail?id=3 lands.

BUG=428848
TEST=added chromeos_unittests PrivetDaemonClient.*

Review URL: https://codereview.chromium.org/869153005

Cr-Commit-Position: refs/heads/master@{#313298}

1 files changed, 4 insertions, 31 deletions

diff --git a/extensions/shell/common/api/shell_gcd.idl b/extensions/shell/common/api/shell_gcd.idl
index c55aad6..7f2175a 100644
--- a/extensions/shell/common/api/shell_gcd.idl
+++ b/extensions/shell/common/api/shell_gcd.idl
@@ -6,38 +6,11 @@
 // running on Chrome OS Core. The actual bootstrapping and GCD registration is
 // handled by the privetd and buffet system daemons.
 namespace shell.gcd {
-  
-  enum SetupStatus {
-    // Not yet configured. Waiting for a connection from the phone or laptop
-    // setup app.
-    unconfigured,
-
-    // Displaying code for user to verify they wish to set up this device.
-    confirmingSetup,
-    
-    // Establishing a secure connection to the setup device and exchanging the
-    // Wi-Fi credentials. 
-    exchangingCredentials,
-    
-    // Connecting to the local network.
-    connectingToNetwork,
-    
-    // Registering with the GCD backend.
-    registering,
-    
-    // Setup completed.
-    completed
-  };
-  
-  callback SetupStatusCallback = void(SetupStatus status);
+ 
+  callback PingCallback = void(boolean success);
 
   interface Functions {
-    // Returns the current setup status via |callback|.
-    static void getSetupStatus(SetupStatusCallback callback);
-  };
-  
-  interface Events {
-    // Notifies that setup has transitioned to a new |status|.
-    static void onSetupStatusChanged(SetupStatus status);
+    // Attempts to ping the daemon via D-Bus.
+    static void ping(PingCallback callback);
   };
 };