bluetooth: Return int8_t and use -128 for unknown tx power.

components/proximity_auth/proximity_monitor_impl.cc

Index: components/proximity_auth/proximity_monitor_impl.cc
diff --git a/components/proximity_auth/proximity_monitor_impl.cc b/components/proximity_auth/proximity_monitor_impl.cc
index e6d8d7b2c01413eaae8acf6cdcec6508303b93ed..224e43252c19a64509983dd448097e109e584fcf 100644
--- a/components/proximity_auth/proximity_monitor_impl.cc
+++ b/components/proximity_auth/proximity_monitor_impl.cc
@@ -204,15 +204,11 @@ void ProximityMonitorImpl::OnConnectionInfo(
     return;
   }
 
-  if (connection_info.rssi != BluetoothDevice::kUnknownPower &&
-      connection_info.transmit_power != BluetoothDevice::kUnknownPower &&
-      connection_info.max_transmit_power != BluetoothDevice::kUnknownPower) {
+  if (connection_info.rssi && connection_info.transmit_power &&
+      connection_info.max_transmit_power) {
     AddSample(connection_info);
   } else {
-    PA_LOG(WARNING) << "[Proximity] Unkown values received from API: "
-                    << connection_info.rssi << " "
-                    << connection_info.transmit_power << " "
-                    << connection_info.max_transmit_power;
+    PA_LOG(WARNING) << "[Proximity] Unkown values received from API.";
     rssi_rolling_average_.reset();
     last_transmit_power_reading_.reset();
     CheckForProximityStateChange();
@@ -235,16 +231,17 @@ void ProximityMonitorImpl::AddSample(
     const BluetoothDevice::ConnectionInfo& connection_info) {
   double weight = kRssiSampleWeight;
   if (!rssi_rolling_average_) {
-    rssi_rolling_average_.reset(new double(connection_info.rssi));
+    rssi_rolling_average_.reset(new double(connection_info.rssi.value()));
   } else {
-    *rssi_rolling_average_ =
-        weight * connection_info.rssi + (1 - weight) * (*rssi_rolling_average_);
+    *rssi_rolling_average_ = weight * connection_info.rssi.value() +
+                             (1 - weight) * (*rssi_rolling_average_);
   }
-  last_transmit_power_reading_.reset(new TransmitPowerReading(
-      connection_info.transmit_power, connection_info.max_transmit_power));
+  last_transmit_power_reading_.reset(
+      new TransmitPowerReading(connection_info.transmit_power.value(),
+                               connection_info.max_transmit_power.value()));
 
   // It's rare but possible for the RSSI to be positive briefly.
-  if (connection_info.rssi >= 0)
+  if (connection_info.rssi.value() >= 0)
     last_zero_rssi_timestamp_.reset(new base::TimeTicks(clock_->NowTicks()));
 
   CheckForProximityStateChange();