bluetooth: android: register for adapter on/off events.

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 a40af0e5d5d66cfdbbe90390a01166d41dd9c36a..55bffb7628f267fbae8be6b839a127281473095a 100644
--- a/device/bluetooth/bluetooth_adapter_unittest.cc
+++ b/device/bluetooth/bluetooth_adapter_unittest.cc
@@ -660,31 +660,40 @@ TEST_F(BluetoothTest, DiscoverMultipleLowEnergyDevices) {
 #if defined(OS_ANDROID)
 TEST_F(BluetoothTest, TogglePowerFakeAdapter) {
   InitWithFakeAdapter();
+  TestBluetoothAdapterObserver observer(adapter_);
+
   ASSERT_TRUE(adapter_->IsPresent());
   ASSERT_TRUE(adapter_->IsPowered());
+  EXPECT_EQ(0, observer.powered_changed_count());
 
   // Check if power can be turned off.
   adapter_->SetPowered(false, GetCallback(Call::EXPECTED),
                        GetErrorCallback(Call::NOT_EXPECTED));
   EXPECT_FALSE(adapter_->IsPowered());
+  EXPECT_EQ(1, observer.powered_changed_count());
 
   // Check if power can be turned on again.
   adapter_->SetPowered(true, GetCallback(Call::EXPECTED),
                        GetErrorCallback(Call::NOT_EXPECTED));
   EXPECT_TRUE(adapter_->IsPowered());
+  EXPECT_EQ(2, observer.powered_changed_count());
 }
 #endif  // defined(OS_ANDROID)
 
 #if defined(OS_ANDROID)
 TEST_F(BluetoothTest, TogglePowerBeforeScan) {
   InitWithFakeAdapter();
+  TestBluetoothAdapterObserver observer(adapter_);
+
   ASSERT_TRUE(adapter_->IsPresent());
   ASSERT_TRUE(adapter_->IsPowered());
+  EXPECT_EQ(0, observer.powered_changed_count());
 
   // Turn off adapter.
   adapter_->SetPowered(false, GetCallback(Call::EXPECTED),
                        GetErrorCallback(Call::NOT_EXPECTED));
   ASSERT_FALSE(adapter_->IsPowered());
+  EXPECT_EQ(1, observer.powered_changed_count());
 
   // Try to perform a scan.
   StartLowEnergyDiscoverySessionExpectedToFail();
@@ -693,6 +702,7 @@ TEST_F(BluetoothTest, TogglePowerBeforeScan) {
   adapter_->SetPowered(true, GetCallback(Call::EXPECTED),
                        GetErrorCallback(Call::NOT_EXPECTED));
   ASSERT_TRUE(adapter_->IsPowered());
+  EXPECT_EQ(2, observer.powered_changed_count());
 
   // Try to perform a scan again.
   ResetEventCounts();