bluetooth: Refactor code that checks if device/service/characteristic is in cache

content/browser/bluetooth/bluetooth_dispatcher_host.h

Index: content/browser/bluetooth/bluetooth_dispatcher_host.h
diff --git a/content/browser/bluetooth/bluetooth_dispatcher_host.h b/content/browser/bluetooth/bluetooth_dispatcher_host.h
index 7e3e7af45cb7d59206db6e04237ee11c962828d7..70517898a292cc24d231afefb0a86f750a547951 100644
--- a/content/browser/bluetooth/bluetooth_dispatcher_host.h
+++ b/content/browser/bluetooth/bluetooth_dispatcher_host.h
@@ -18,6 +18,10 @@ namespace device {
 class BluetoothUUID;
 }
 
+namespace blink {
+enum class WebBluetoothError;
+}
+
 namespace content {
 
 struct BluetoothScanFilter;
@@ -55,6 +59,23 @@ class CONTENT_EXPORT BluetoothDispatcherHost final
 
   struct RequestDeviceSession;
 
+  enum class CacheQueryOutcome {
+    SUCCESS = 0,
+    BAD_RENDERER = 1,
+    NO_DEVICE = 2,
+    NO_SERVICE = 3,
+    NO_CHARACTERISTIC = 4
+  };
+
+  blink::WebBluetoothError CacheQueryOutcomeToWebBluetoothError(
+      CacheQueryOutcome outcome);
+  std::pair<CacheQueryOutcome, device::BluetoothDevice*> QueryForDevice(
+      const std::string& device_instance_id);
+  std::pair<CacheQueryOutcome, device::BluetoothGattService*> QueryForService(
+      const std::string& service_instance_id);
+  std::pair<CacheQueryOutcome, device::BluetoothGattCharacteristic*>
+  QueryForCharacteristic(const std::string& characteristic_instance_id);
+
   // Set |adapter_| to a BluetoothAdapter instance and register observers,
   // releasing references to previous |adapter_|.
   void set_adapter(scoped_refptr<device::BluetoothAdapter> adapter);