Test for Debugger.evaluateOnCallFrame with scopeNumber

Running test: testEvaluateOnScopes
Paused with 4 scopes in scopeChain.
Scope 0: local
Scope 1: closure
Scope 2: script
Scope 3: global
Eval "a" at scopeNumber=undefined:
  Result: inner_stack
Eval "a" at scopeNumber=0:
  Result: inner_stack
Eval "a" at scopeNumber=1:
  Result: closure_outer
Eval "closure_y" at scopeNumber=0:
  Result: 20
Eval "closure_y" at scopeNumber=1:
  Result: 20
Eval "x" at scopeNumber=0:
  Result: 10
Eval "x" at scopeNumber=1:
  Exception: ReferenceError: x is not defined
    at eval (eval at inner (test.js:10:11), <anonymous>:1:1)
    at inner (test.js:22:11)
    at outer (test.js:25:16)
    at <anonymous>:1:1
Eval "z" at scopeNumber=0:
  Result: global_z
Eval "z" at scopeNumber=1:
  Result: global_z
Eval "a" at scopeNumber=999:
  Error: Could not find scope with given number
Eval "a" at scopeNumber=-1:
  Error: Could not find scope with given number