PBJS support for stored responses

[idettman]

Type of change

• Feature

Description of change

Towards utilizing the Stored Response feature described in prebid/prebid-server#861, some changes are needed in PBJS.
The basic idea is to extend the awesome debugging feature already present in PBJS. http://prebid.org/dev-docs/troubleshooting-tips.html#modify-bid-responses-for-testing

Our SE team can add another attribute to the existing debugging object, which will be saved in local storage. The Rubicon and PBS adapters look for debugging storedAuctionResponse property before it sends a video request, passing imp[].ext.prebid.storedauctionresponse.id in the openrtb.

javascript console> pbjs.setConfig({
  debugging: {
    enabled: true,
    bidRequests: [
         {bidder: "rubicon", adUnitCode: "/123", storedAuctionResponse=11111},
         {bidder: "rubicon", adUnitCode: "/456", storedAuctionResponse=22222}
    ]
  }
});

Other information

[harpere]

@idettman conflicts need to be fixed.

[harpere]

I think it looks good other than the one minor comment and the conflict.

[snapwich]

I don't have time to thoroughly test the changes you made in the auction requests, hopefully our tests are good! LGTM