Implement 'setVariableValue' for debugger block scopes.

test/mjsunit/harmony/debug-evaluate-blockscopes.js

Index: test/mjsunit/harmony/debug-evaluate-blockscopes.js
diff --git a/test/mjsunit/harmony/debug-evaluate-blockscopes.js b/test/mjsunit/harmony/debug-evaluate-blockscopes.js
index 16885d009e8ef0f0c8ffaf84b01345fef5b324af..7fedf74308a4b9026b9540892ee172700b17dba3 100644
--- a/test/mjsunit/harmony/debug-evaluate-blockscopes.js
+++ b/test/mjsunit/harmony/debug-evaluate-blockscopes.js
@@ -67,3 +67,31 @@ assertEquals(1, result);
 Debug.clearBreakPoint(bp);
 // Get rid of the debug event listener.
 Debug.setListener(null);
+
+
+function f1() {
+  {
+    let i = 1;

[rossberg, 2014/11/14 12:35:24]

Considering stack allocated block variables being up next, maybe already have 2
versions of this test: one where i will (hopefully) be stack-allocated soon, and
one where it will still be context-allocated.

[Dmitry Lomov (no reviews), 2014/11/14 13:38:26]

Done.

+    debugger;
+    assertEquals(2, i);
+  }
+}
+
+var exception;
+Debug.setListener(function (event, exec_state, event_data, data) {
+  try {
+    if (event == Debug.DebugEvent.Break) {
+      var frame = exec_state.frame();
+      assertEquals(1, frame.evaluate("i").value());
+      var allScopes = frame.allScopes();
+      assertEquals(1, allScopes[0].scopeObject().value().i);
+      allScopes[0].setVariableValue('i', 2);

[aandrey, 2014/11/14 12:39:58]

nit: ' or " (see 3 lines above)

[Dmitry Lomov (no reviews), 2014/11/14 13:38:27]

Done.

+    }
+  } catch (e) {
+    exception = e;
+  }
+});
+
+exception = null;
+f1();
+assertEquals(null, exception, exception);