bluetooth: Implement TxPower and RSSI of BluetoothAdvertisementData

third_party/WebKit/public/platform/modules/bluetooth/WebBluetoothDevice.h

 // 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.
 
 #ifndef WebBluetoothDevice_h
 #define WebBluetoothDevice_h
 
 #include "public/platform/WebString.h"
 #include "public/platform/WebVector.h"
 
 namespace blink {
 
 // Information describing a Bluetooth device provided by the platform.
 struct WebBluetoothDevice {
     enum class VendorIDSource {
         Unknown,
         Bluetooth,
         USB
     };
 
     WebBluetoothDevice(const WebString& id,
         const WebString& name,
+        int txPower,
+        int rssi,
         int32_t deviceClass,
         VendorIDSource vendorIDSource,
         uint16_t vendorID,
         uint16_t productID,
         uint16_t productVersion,
         bool paired,
         const WebVector<WebString>& uuids)
         : id(id)
         , name(name)
+        , txPower(txPower)
+        , rssi(rssi)
         , deviceClass(deviceClass)
         , vendorIDSource(vendorIDSource)
         , vendorID(vendorID)
         , productID(productID)
         , productVersion(productVersion)
         , paired(paired)
         , uuids(uuids)
     {
     }
 
     // Members corresponding to BluetoothDevice attributes as specified in IDL.
     const WebString id;
     const WebString name;
+    // Powers:
+    // In practice these values should be between [-127, 20], but since the
+    // since the underlying platform uses int16 rather than int8 blink turns

[scheib, 2015/10/29 20:59:13]

I don't think the int16 reference makes much sense here. Just document what
valid input values are and what the special number is that represents an invalid
value. Possibly use an int8_t to reduce the comment size (as then there is only
1 special value range, not 3).

+    // values smaller than INT8_MIN or larger than INT8_MAX into INT8_MAX. A
+    // value of INT8_MAX denotes an invalid power.
+    const int txPower;
+    const int rssi;
     const int32_t deviceClass;
     const VendorIDSource vendorIDSource;
     const uint16_t vendorID;
     const uint16_t productID;
     const uint16_t productVersion;
     const bool paired;
     const WebVector<WebString> uuids;
 };
 
 } // namespace blink
 
 #endif // WebBluetoothDevice_h