arc: bluetooth: Implement Gatt server request to read/write

components/arc/bluetooth/arc_bluetooth_bridge.h

Index: components/arc/bluetooth/arc_bluetooth_bridge.h
diff --git a/components/arc/bluetooth/arc_bluetooth_bridge.h b/components/arc/bluetooth/arc_bluetooth_bridge.h
index c545b21a47fbca5cbcbc9ac95012edf227da30d8..cf0926b23e92a6ccf763754b4d4ed3ea0185e958 100644
--- a/components/arc/bluetooth/arc_bluetooth_bridge.h
+++ b/components/arc/bluetooth/arc_bluetooth_bridge.h
@@ -43,8 +43,7 @@ class ArcBluetoothBridge
   explicit ArcBluetoothBridge(ArcBridgeService* bridge_service);
   ~ArcBluetoothBridge() override;
 
-  // Overridden from
-  // InstanceHolder<mojom::BluetoothInstance>::Observer:
+  // Overridden from InstanceHolder<mojom::BluetoothInstance>::Observer:
   void OnInstanceReady() override;
 
   void OnAdapterInitialized(scoped_refptr<device::BluetoothAdapter> adapter);
@@ -341,6 +340,23 @@ class ArcBluetoothBridge
   template <class LocalGattAttribute>
   int32_t CreateGattAttributeHandle(LocalGattAttribute* gatt_attr);
 
+  // Common code for OnCharacteristicReadRequest and OnDescriptorReadRequest
+  template <class LocalGattAttribute>
+  void OnGattAttributeReadRequest(const device::BluetoothDevice* device,
+                                  const LocalGattAttribute* gatt_attr,
+                                  int offset,
+                                  const ValueCallback& success_callback,
+                                  const ErrorCallback& error_callback);
+
+  // Common code for OnCharacteristicWriteRequest and OnDescriptorWriteRequest
+  template <class LocalGattAttribute>
+  void OnGattAttributeWriteRequest(const device::BluetoothDevice* device,
+                                   const LocalGattAttribute* gatt_attr,
+                                   const std::vector<uint8_t>& value,
+                                   int offset,
+                                   const base::Closure& success_callback,
+                                   const ErrorCallback& error_callback);
+
   bool CalledOnValidThread();
 
   int32_t next_gatt_server_attribute_handle() {
@@ -357,6 +373,8 @@ class ArcBluetoothBridge
       notification_session_;
   // Map from android int handle to Chrome (BlueZ) string identifier.
   std::unordered_map<int32_t, std::string> gatt_identifier_;
+  // Map from Chrome (BlueZ) string identifier to android int handle.
+  std::unordered_map<std::string, int32_t> gatt_handle_;
   // Store last GattCharacteristic added to each GattService for GattServer.
   std::unordered_map<int32_t, int32_t> last_characteristic_;
   // Monotonically increasing value to use as handle to give to Android side.