Don't send a value changed notification when a characteristic is written

device/bluetooth/bluetooth_remote_gatt_characteristic_unittest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdint.h>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
@@ skipping 541 matching lines @@
 #if defined(OS_ANDROID) || defined(OS_MACOSX) || defined(OS_WIN)
 // Tests WriteRemoteCharacteristic with non-empty value buffer.
 TEST_F(BluetoothRemoteGattCharacteristicTest, WriteRemoteCharacteristic) {
   if (!PlatformSupportsLowEnergy()) {
     LOG(WARNING) << "Low Energy Bluetooth unavailable, skipping unit test.";
     return;
   }
   ASSERT_NO_FATAL_FAILURE(FakeCharacteristicBoilerplate(
       BluetoothRemoteGattCharacteristic::PROPERTY_WRITE));
 
+  TestBluetoothAdapterObserver observer(adapter_);
+
   uint8_t values[] = {0, 1, 2, 3, 4, 0xf, 0xf0, 0xff};
   std::vector<uint8_t> test_vector(values, values + arraysize(values));
   characteristic1_->WriteRemoteCharacteristic(
       test_vector, GetCallback(Call::EXPECTED),
       GetGattErrorCallback(Call::NOT_EXPECTED));
 
   SimulateGattCharacteristicWrite(characteristic1_);
 
   EXPECT_EQ(1, gatt_write_characteristic_attempts_);
+#if !defined(OS_WIN)
+  // TODO(crbug.com/653291): remove this #if once the bug on windows is fixed.
+  EXPECT_EQ(0, observer.gatt_characteristic_value_changed_count());
+#endif
   EXPECT_EQ(test_vector, last_write_value_);
 }
 #endif  // defined(OS_ANDROID) || defined(OS_MACOSX) || defined(OS_WIN)
 
 #if defined(OS_ANDROID) || defined(OS_MACOSX) || defined(OS_WIN)
 // Tests ReadRemoteCharacteristic and GetValue multiple times.
 TEST_F(BluetoothRemoteGattCharacteristicTest, ReadRemoteCharacteristic_Twice) {
   if (!PlatformSupportsLowEnergy()) {
     LOG(WARNING) << "Low Energy Bluetooth unavailable, skipping unit test.";
     return;
@@ skipping 1550 matching lines @@
   EXPECT_EQ(1u, characteristic1_->GetDescriptorsByUUID(id2).size());
   EXPECT_EQ(2u, characteristic2_->GetDescriptorsByUUID(id3).size());
 
   EXPECT_EQ(0u, characteristic2_->GetDescriptorsByUUID(id1).size());
   EXPECT_EQ(0u, characteristic2_->GetDescriptorsByUUID(id2).size());
   EXPECT_EQ(0u, characteristic1_->GetDescriptorsByUUID(id3).size());
 }
 #endif  // defined(OS_ANDROID) || defined(OS_WIN)
 
 }  // namespace device