Show browser notifications when transactions complete.

[danfinlay]

We should use the browser notification API to let the user know when a transaction enters a [final state]:

• confirmed
• failed
• dropped

Those three confirmations would have their own texts:

Confirmed tx

Transaction ${tx.nonce} confirmed! View on Etherscan

Failed tx

Transaction ${tx.nonce} failed. (Maybe append tx.error.message)

Dropped tx

A Transaction ${tx.nonce} was dropped, because another transaction with that number was successfully processed.

(We may not want to show this one, especially since it is usually accompanied by a confirmed tx)

Implementation

Should use extensionizer to access the notifications API:

https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/notifications

MetaMask does not include platform-specific APIs within the metamask-controller or its dependencies. Instead, functions to showConfirmedTransaction, showFailedTransaction, and showDroppedTransaction should be defined on the extension platform object, which is passed in to the MetaMask controller on initialization:
https://github.com/MetaMask/metamask-extension/blob/develop/app/scripts/background.js#L261

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