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 8ea114b860bce2742aeded97b9ed060650aa7673..4c4cfc5de95a92cb744b39a5dda6ce494998feed 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
@@ -111,6 +111,15 @@ class BluetoothLowEnergyEventRouter
                                const base::Closure& callback,
                                const base::Closure& error_callback);
 
+  // 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);