Remove outdated devices from Android device chooser

device/bluetooth/bluetooth_adapter_unittest.cc

Index: device/bluetooth/bluetooth_adapter_unittest.cc
diff --git a/device/bluetooth/bluetooth_adapter_unittest.cc b/device/bluetooth/bluetooth_adapter_unittest.cc
index feba4304c6ae1d212e2474383fe099550d06f437..d485802318f6f5c2ea04650e9a6a85e8e47cfbcc 100644
--- a/device/bluetooth/bluetooth_adapter_unittest.cc
+++ b/device/bluetooth/bluetooth_adapter_unittest.cc
@@ -718,4 +718,66 @@ TEST_F(BluetoothTest, TogglePowerBeforeScan) {
 }
 #endif  // defined(OS_ANDROID)
 
+// This test should only be enabled for platforms that uses the
+// BluetoothAdapter#RemoveOutdatedDevices function to purge outdated
+// devices.
+#if defined(OS_ANDROID) || defined(OS_MACOSX)
+TEST_F(BluetoothTest, EnsureUpdatedTimestamps) {
+  if (!PlatformSupportsLowEnergy()) {
+    LOG(WARNING) << "Low Energy Bluetooth unavailable, skipping unit test.";
+    return;
+  }
+  InitWithFakeAdapter();
+  TestBluetoothAdapterObserver observer(adapter_);
+
+  // Test that the timestamp of a device is updated during multiple
+  // discovery sessions.
+  StartLowEnergyDiscoverySession();
+  BluetoothDevice* device = DiscoverLowEnergyDevice(1);
+  EXPECT_EQ(1, observer.device_added_count());
+  EXPECT_EQ(1u, adapter_->GetDevices().size());
+  base::Time first_timestamp = device->GetLastUpdateTime();
+
+  // Do a new discovery and check that the timestamp is updated.
+  StartLowEnergyDiscoverySession();
+  observer.Reset();
+  DiscoverLowEnergyDevice(1);
+  EXPECT_EQ(0, observer.device_added_count());
+  EXPECT_EQ(1u, adapter_->GetDevices().size());
+  base::Time second_timestamp = device->GetLastUpdateTime();
+  EXPECT_TRUE(second_timestamp > first_timestamp);
+
+  // Check that timestamp doesn't change when there is no discovery.
+  base::Time third_timestamp = device->GetLastUpdateTime();
+  EXPECT_TRUE(second_timestamp == third_timestamp);
+}
+#endif  // defined(OS_ANDROID) || defined(OS_MACOSX)
+
+// This test should only be enabled for platforms that uses the
+// BluetoothAdapter#RemoveOutdatedDevices function to purge outdated
+// devices.
+#if defined(OS_ANDROID) || defined(OS_MACOSX)
+TEST_F(BluetoothTest, RemoveOutdatedDevices) {
+  if (!PlatformSupportsLowEnergy()) {
+    LOG(WARNING) << "Low Energy Bluetooth unavailable, skipping unit test.";
+    return;
+  }
+  InitWithFakeAdapter();
+  StartLowEnergyDiscoverySession();
+  BluetoothDevice* device1 = DiscoverLowEnergyDevice(1);
+  BluetoothDevice* device2 = DiscoverLowEnergyDevice(4);
+  EXPECT_EQ(2u, adapter_->GetDevices().size());
+
+  // Set timestamp of device1 so that it appears as expired.
+  device1->last_update_time_ =
+      base::Time::NowFromSystemTime() -
+      (BluetoothAdapter::timeoutSec + base::TimeDelta::FromSeconds(1));
+
+  // Check that outdated devices are removed.
+  adapter_->RemoveTimedOutDevices();
+  EXPECT_EQ(1u, adapter_->GetDevices().size());
+  EXPECT_EQ(adapter_->GetDevices()[0]->GetAddress(), device2->GetAddress());
+}
+#endif  // defined(OS_ANDROID) || defined(OS_MACOSX)
+
 }  // namespace device