cros: Read privetd Wi-Fi bootstrap status over D-Bus

Use the D-Bus library to automatically reads the property
state at startup and monitor it for changes.

Wrap it in a chrome.shell API for manual testing. This will
be removed once bootstrap is wired into OOBE.

BUG=428848
TEST=app_shell_unittests, manual tests with app in the bug

Review URL: https://codereview.chromium.org/719713004

Cr-Commit-Position: refs/heads/master@{#314462}

1 files changed, 8 insertions, 0 deletions

diff --git a/extensions/shell/common/api/shell_gcd.idl b/extensions/shell/common/api/shell_gcd.idl
index 7f2175a..65c80300 100644
--- a/extensions/shell/common/api/shell_gcd.idl
+++ b/extensions/shell/common/api/shell_gcd.idl
@@ -5,12 +5,20 @@
 // Setup related functions for a Google Cloud Devices (GCD) target device
 // running on Chrome OS Core. The actual bootstrapping and GCD registration is
 // handled by the privetd and buffet system daemons.
+//
+// TODO(jamescook): This API exists only for manual testing of GCD in app_shell.
+// Delete it when GCD setup is integrated into OOBE.
 namespace shell.gcd {
  
   callback PingCallback = void(boolean success);
+  callback StateCallback = void(DOMString state);
 
   interface Functions {
     // Attempts to ping the daemon via D-Bus.
     static void ping(PingCallback callback);
+
+    // Returns the Wi-Fi bootstrap state. Return values are found in
+    // platform2/privetd/dbus_bindings/org.chromium.privetd.Manager.xml.
+    static void getWiFiBootstrapState(StateCallback callback);
   };
 };