Fixing layout in js output (use full paths rather than just the library name)

test/codegen/expect/methods/methods.js

-var methods;
-(function(exports) {
-  'use strict';
-  class A extends dart.Object {
-    A() {
-      this._c = 3;
-    }
-    x() {
-      return 42;
-    }
-    y(a) {
-      return a;
-    }
-    z(b) {
-      if (b === void 0)
-        b = null;
-      return dart.notNull(b);
-    }
-    zz(b) {
-      if (b === void 0)
-        b = 0;
-      return b;
-    }
-    w(a, opt$) {
-      let b = opt$.b === void 0 ? null : opt$.b;
-      return dart.notNull(a + dart.notNull(b));
-    }
-    ww(a, opt$) {
-      let b = opt$.b === void 0 ? 0 : opt$.b;
-      return a + b;
-    }
-    get a() {
-      return this.x();
-    }
-    set b(b) {}
-    get c() {
-      return this._c;
-    }
-    set c(c) {
-      this._c = c;
-    }
-  }
-  class Bar extends dart.Object {
-    call(x) {
-      return core.print(`hello from ${x}`);
-    }
-  }
-  class Foo extends dart.Object {
-    Foo() {
-      this.bar = new Bar();
-    }
-  }
-  // Function test: () → dynamic
-  function test() {
-    let f = new Foo();
-    dart.dinvoke(f, 'bar', "Bar's call method!");
-  }
-  // Exports:
-  exports.A = A;
-  exports.Bar = Bar;
-  exports.Foo = Foo;
-  exports.test = test;
-})(methods || (methods = {}));