[Nearby] Invalidate surfaces when Bluetooth adapter is acquired.

This addresses a bug in which advertising was not starting on sign-in.
This was because Bluetooth adapter was not acquired in time for the
initial round of checks.

Bug: 1132063
Change-Id: I6ce9ad8ad9ca5c02a0cb00eb60b8d80f852a355e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2431586Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Michael Hansen <hansenmichael@google.com>
Cr-Commit-Position: refs/heads/master@{#810910}

chrome/browser/nearby_sharing/nearby_sharing_service_impl.cc

@@ -1032,6 +1032,10 @@ void NearbySharingServiceImpl::OnGetBluetoothAdapter(
     scoped_refptr<device::BluetoothAdapter> adapter) {
   bluetooth_adapter_ = adapter;
   bluetooth_adapter_->AddObserver(this);
+
+  // TODO(crbug.com/1132469): This was added to fix an issue where advertising
+  // was not starting on sign-in. Add a unit test to cover this case.
+  InvalidateSurfaceState();
 }
 
 void NearbySharingServiceImpl::StartFastInitiationAdvertising() {