chrome.bluetoothLowEnergy: Implement writeCharacteristicValue.

chrome/browser/extensions/api/bluetooth_low_energy/bluetooth_low_energy_event_router.h

Index: chrome/browser/extensions/api/bluetooth_low_energy/bluetooth_low_energy_event_router.h
diff --git a/chrome/browser/extensions/api/bluetooth_low_energy/bluetooth_low_energy_event_router.h b/chrome/browser/extensions/api/bluetooth_low_energy/bluetooth_low_energy_event_router.h
index 6579b4b387eacc0152e1b42e31aa61e17d1c22b5..fea7f5bc014a74952270643664e1f902a5dfb318 100644
--- a/chrome/browser/extensions/api/bluetooth_low_energy/bluetooth_low_energy_event_router.h
+++ b/chrome/browser/extensions/api/bluetooth_low_energy/bluetooth_low_energy_event_router.h
@@ -103,6 +103,15 @@ class BluetoothLowEnergyEventRouter
       const std::string& instance_id,
       api::bluetooth_low_energy::Characteristic* out_characteristic) const;
 
+  // Sends a request to write the value of the characteristic with instance ID
+  // |instance_id|, with value |value|. Returns false, if no such characteristic
+  // is known. Otherwise, returns true and invokes |callback| on success and
+  // |error_callback| on failure.
+  bool WriteCharacteristicValue(const std::string& instance_id,
+                                const std::vector<uint8>& value,
+                                const base::Closure& callback,
+                                const base::Closure& error_callback);
+
   // Initializes the adapter for testing. Used by unit tests only.
   void SetAdapterForTesting(device::BluetoothAdapter* adapter);