[CrOS MultiDevice] Add an ID to FakeErrorTolerantBleAdvertisement.

Bug: 824568, 752273
Change-Id: I7a58651e9a137ae0c35c7a8085d931ad3cf28647
Reviewed-on: https://chromium-review.googlesource.com/1092161Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565517}

chromeos/services/secure_channel/fake_error_tolerant_ble_advertisement.cc

@@ -14,6 +14,7 @@ FakeErrorTolerantBleAdvertisement::FakeErrorTolerantBleAdvertisement(
     const DeviceIdPair& device_id_pair,
     base::OnceCallback<void(const DeviceIdPair&)> destructor_callback)
     : ErrorTolerantBleAdvertisement(device_id_pair),
+      id_(base::UnguessableToken::Create()),
       destructor_callback_(std::move(destructor_callback)) {}
 
 FakeErrorTolerantBleAdvertisement::~FakeErrorTolerantBleAdvertisement() {

chromeos/services/secure_channel/fake_error_tolerant_ble_advertisement.h

@@ -7,6 +7,7 @@
 
 #include "base/callback.h"
 #include "base/macros.h"
+#include "base/unguessable_token.h"
 #include "chromeos/services/secure_channel/device_id_pair.h"
 #include "chromeos/services/secure_channel/error_tolerant_ble_advertisement.h"
 
@@ -22,6 +23,8 @@ class FakeErrorTolerantBleAdvertisement : public ErrorTolerantBleAdvertisement {
       base::OnceCallback<void(const DeviceIdPair&)> destructor_callback);
   ~FakeErrorTolerantBleAdvertisement() override;
 
+  const base::UnguessableToken& id() const { return id_; }
+
   void InvokeStopCallback();
 
   // ErrorTolerantBleAdvertisement:
@@ -29,6 +32,7 @@ class FakeErrorTolerantBleAdvertisement : public ErrorTolerantBleAdvertisement {
   bool HasBeenStopped() override;
 
  private:
+  base::UnguessableToken id_;
   base::OnceCallback<void(const DeviceIdPair&)> destructor_callback_;
   base::Closure stop_callback_;