RESTRICT AUTOMERGE Implement sendBroadcastAsUserMultiplePermissions in BridgeContext.

sendBroadcastAsUserMultiplePermissions was added to Context.java.
Implementing in BridgeContext.

Fix oc-dev since BridgeContext is in frameworks/base/tools/layoutlib,
whereas in later branches the file is in frameworks/layoutlib

Test: Compile / build (actual usage is documented in other bugs)
Bug: 159373687
Change-Id: I8715b6fce7039268eb29914cb15f68ab922f4d3f
Merged-In: I857ea00cc58a0abbb77960643f361dd6dd9c8b56