Add the chrome.bluetoothLowEnergy.setAdvertisingInterval API.

chrome/common/extensions/api/bluetooth_low_energy.idl

Index: chrome/common/extensions/api/bluetooth_low_energy.idl
diff --git a/chrome/common/extensions/api/bluetooth_low_energy.idl b/chrome/common/extensions/api/bluetooth_low_energy.idl
index 0433fb3eec28fb9e9ee79ce82e214d941627e79b..bdf4f7062f45bc97453076a6ffa25b2c15ec6f5f 100644
--- a/chrome/common/extensions/api/bluetooth_low_energy.idl
+++ b/chrome/common/extensions/api/bluetooth_low_energy.idl
@@ -464,6 +464,18 @@ namespace bluetoothLowEnergy {
     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