bluetooth: Add characteristicvaluechanged event

device/bluetooth/test/mock_bluetooth_gatt_notify_session.h

Index: device/bluetooth/test/mock_bluetooth_gatt_notify_session.h
diff --git a/device/bluetooth/test/mock_bluetooth_gatt_notify_session.h b/device/bluetooth/test/mock_bluetooth_gatt_notify_session.h
index 97c28e7bb6ef5f0bd33148b46c7c2a3e568cd3f8..c60a8421eba398002e5c9edf2d2d06f9e7d1c251 100644
--- a/device/bluetooth/test/mock_bluetooth_gatt_notify_session.h
+++ b/device/bluetooth/test/mock_bluetooth_gatt_notify_session.h
@@ -8,11 +8,15 @@
 #include <string>
 
 #include "base/callback.h"
+#include "base/timer/timer.h"
 #include "device/bluetooth/bluetooth_gatt_notify_session.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace device {
 
+class MockBluetoothAdapter;
+class MockBluetoothGattCharacteristic;
+
 class MockBluetoothGattNotifySession : public BluetoothGattNotifySession {
  public:
   explicit MockBluetoothGattNotifySession(
@@ -23,7 +27,20 @@ class MockBluetoothGattNotifySession : public BluetoothGattNotifySession {
   MOCK_METHOD0(IsActive, bool());
   MOCK_METHOD1(Stop, void(const base::Closure&));
 
+  // Starts notifying the adapter's observers that the characteristic's value
+  // changed.
+  void StartTestNotifications(MockBluetoothAdapter* adapter,
+                              MockBluetoothGattCharacteristic* characteristic,
+                              const std::vector<uint8_t>& value);
+  void StopTestNotifications();
+
  private:
+  void TestNotify(MockBluetoothAdapter* adapter,
+                  MockBluetoothGattCharacteristic* characteristic,
+                  const std::vector<uint8_t>& value);
+
+  base::RepeatingTimer test_notifications_timer_;
+
   DISALLOW_COPY_AND_ASSIGN(MockBluetoothGattNotifySession);
 };