tree e22bd89187f5e8668767e5fba070ac0143730be3
parent 94d05a9c26460f87045bf1f2165253d95ae0b687
author Roberto Lublinerman <rluble@google.com> 1465956016 -0700
committer Roberto Lublinerman <rluble@google.com> 1466710741 -0700

Change restrictions for JsFunction implementations.

This patch *adds* the following restrictions:
- JsFunction implementations cannot define any method that has
  dynamic dispatch. In particular it can not override j.l.Object
  methods.
- JsFunction interfaces fields and methods other than the SAM
  need explicit @JsOverlay markers

This patch *relaxes* the following restrictions:
- Default methods can be declared in JsFunction interfaces as long
  as they are JsOverlay.

The intention is to make sure JsFunction implementations do not
need to be backed up by class at runtime and can eventually be
implemented as just lightweight JS functions.

Bug: #9348
Bug-Link: http://github.com/gwtproject/gwt/issues/9348
Change-Id: I7746100e9122c47c0100e396d085884582b0f916