Add the chrome.bluetoothLowEnergy.setAdvertisingInterval API.

chrome/common/extensions/api/bluetooth_low_energy.idl

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // The <code>chrome.bluetoothLowEnergy</code> API is used to communicate with
 // Bluetooth Smart (Low Energy) devices using the
 // <a href="https://developer.bluetooth.org/TechnologyOverview/Pages/GATT.aspx">
 // Generic Attribute Profile (GATT)</a>.
 namespace bluetoothLowEnergy {
   // Values representing the possible properties of a characteristic.
@@ skipping 446 matching lines @@
 
     // Unregisters an advertisement and stops its advertising. If the
     // advertisement fails to unregister the only way to stop advertising
     // might be to restart the device.
     // |advertisementId|: Id of the advertisement to unregister.
     // |callback|: Called once the advertisement is unregistered and is no
     // longer being advertised.
     static void unregisterAdvertisement(long advertisementId,
         ResultCallback callback);
 
+    // Set's the interval betweeen two consecutive advertisements. Note:
+    // This is a best effort. The actual interval may vary non-trivially
+    // from the specified intervals. On some hardware, we will not even

[Devlin, 2016/09/21 17:07:03]

s/we will not even attempt to have a minimum interval under 100ms/there is a
minimum interval of 100ms.

[Rahul Chaturvedi, 2016/09/21 18:54:12]

Done.

+    // attempt to have a minimum interval under 100ms.
+    // |minInterval|: Minimum interval between advertisments (in
+    // milliseconds). This cannot be lower than 20ms.
+    // |maxInterval|: Maximum interval between advertisments (in
+    // milliseconds). This cannot be more than 10240ms.

[Devlin, 2016/09/21 17:07:03]

Out of curiosity, why 10240?

[Rahul Chaturvedi, 2016/09/21 18:54:12]

These are limits required by the spec. Added a line to the header comment to
clarify.

+    // |callback|: Called once the interval has been set.
+    static void setAdvertisingInterval(long minInterval, long maxInterval,
+        ResultCallback callback);
+
     // Sends a response for a characteristic or descriptor read/write
     // request.
     // This function is only available if the app has both the
     // bluetooth:low_energy and the bluetooth:peripheral permissions set to
     // true. The peripheral permission may not be available to all apps.
     // |response|: The response to the request.
     static void sendRequestResponse(Response response);
   };
 
   interface Events {
@@ skipping 66 matching lines @@
     // this request for a long time may lead to a disconnection.
     // This event is only available if the app has both the
     // bluetooth:low_energy and the bluetooth:peripheral permissions set to
     // true. The peripheral permission may not be available to all apps.
     // |request|: Request data for this request.
     // |descriptor|: The GATT descriptor whose value is being written.
     static void onDescriptorWriteRequest(
         Request request, DOMString descriptorId);
   };
 };