[web-bluetooth] Convert unsigned long to string

[Giovanni Ortuño]

Hello blink-dev,

I'm trying to implement a function that takes an 'unsigned long' and returns a string with the hex representation of the unsigned long appended to it:

https://webbluetoothcg.github.io/web-bluetooth/#dom-bluetoothuuid-canonicaluuid

I thought about using strigstreamer and std::hex but I haven't seen std::hex being used in Blink. Also since this function gets it's input directly from the user I figured I should ask in case there are any security issues I should be aware of.

Thanks

Gio

[Vincent Scheib]

HexNumber.h looks promising. 

[Giovanni Ortuño]

Thanks!