[bluetooth][win] Force uncached descriptor value reads

This is a follow-up to r614437 which updates ReadRemoteDescriptor() to also use
the uncached variant of the ReadValueAsync() function so as not to return a
stale value.

Bug: 904114
Change-Id: Ifb7e0be25f799eadc4f1e65aea6c6c5850649019
Reviewed-on: https://chromium-review.googlesource.com/c/1366321
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614529}

diff --git a/device/bluetooth/bluetooth_remote_gatt_descriptor_winrt.cc b/device/bluetooth/bluetooth_remote_gatt_descriptor_winrt.cc
index 3c7b806f..e70433a 100644
--- a/device/bluetooth/bluetooth_remote_gatt_descriptor_winrt.cc
+++ b/device/bluetooth/bluetooth_remote_gatt_descriptor_winrt.cc

@@ -18,6 +18,7 @@
 
 namespace {
 
+using ABI::Windows::Devices::Bluetooth::BluetoothCacheMode_Uncached;
 using ABI::Windows::Devices::Bluetooth::GenericAttributeProfile::
     GattCommunicationStatus;
 using ABI::Windows::Devices::Bluetooth::GenericAttributeProfile::
@@ -26,14 +27,14 @@
 using ABI::Windows::Devices::Bluetooth::GenericAttributeProfile::
     GattWriteResult;
 using ABI::Windows::Devices::Bluetooth::GenericAttributeProfile::
-    IGattDescriptor2;
-using ABI::Windows::Devices::Bluetooth::GenericAttributeProfile::
     IGattDescriptor;
 using ABI::Windows::Devices::Bluetooth::GenericAttributeProfile::
-    IGattReadResult2;
+    IGattDescriptor2;
 using ABI::Windows::Devices::Bluetooth::GenericAttributeProfile::
     IGattReadResult;
 using ABI::Windows::Devices::Bluetooth::GenericAttributeProfile::
+    IGattReadResult2;
+using ABI::Windows::Devices::Bluetooth::GenericAttributeProfile::
     IGattWriteResult;
 using ABI::Windows::Foundation::IAsyncOperation;
 using ABI::Windows::Storage::Streams::IBuffer;
@@ -106,9 +107,10 @@
   }
 
   ComPtr<IAsyncOperation<GattReadResult*>> read_value_op;
-  HRESULT hr = descriptor_->ReadValueAsync(&read_value_op);
+  HRESULT hr = descriptor_->ReadValueWithCacheModeAsync(
+      BluetoothCacheMode_Uncached, &read_value_op);
   if (FAILED(hr)) {
-    VLOG(2) << "GattDescriptor::ReadValueAsync failed: "
+    VLOG(2) << "GattDescriptor::ReadValueWithCacheModeAsync failed: "
             << logging::SystemErrorCodeToString(hr);
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE,