Add Device Policy Handler for Bluetooth, and allow disabling the Bluetooth adapter on Chrome OS

device/bluetooth/bluetooth_adapter_bluez.cc

Index: device/bluetooth/bluetooth_adapter_bluez.cc
diff --git a/device/bluetooth/bluetooth_adapter_bluez.cc b/device/bluetooth/bluetooth_adapter_bluez.cc
index 4424b0229d667befdb432cfc2b17dc4dd88d3040..2a8232cdd4d1e7881d4196312177d42199306f3c 100644
--- a/device/bluetooth/bluetooth_adapter_bluez.cc
+++ b/device/bluetooth/bluetooth_adapter_bluez.cc
@@ -153,6 +153,7 @@ BluetoothAdapterBlueZ::BluetoothAdapterBlueZ(const InitCallback& init_callback)
     : init_callback_(init_callback),
       initialized_(false),
       dbus_is_shutdown_(false),
+      is_disabled_(false),
       num_discovery_sessions_(0),
       discovery_request_pending_(false),
       weak_ptr_factory_(this) {
@@ -254,7 +255,15 @@ bool BluetoothAdapterBlueZ::IsInitialized() const {
 }
 
 bool BluetoothAdapterBlueZ::IsPresent() const {
-  return !dbus_is_shutdown_ && !object_path_.value().empty();
+  return !is_disabled_ && !dbus_is_shutdown_ && !object_path_.value().empty();
+}
+
+void BluetoothAdapterBlueZ::SetDisabled(bool disabled) {
+  if (disabled) {
+    SetPowered(false, base::Bind(&base::DoNothing),
+                      base::Bind(&base::DoNothing));
+  }
+  is_disabled_ = disabled;
 }
 
 bool BluetoothAdapterBlueZ::IsPowered() const {