[debugger] Add JSProxy support in Runtime::GetInternalProperties

For proxy object this methods returns target value, handler object and is revoked flag.

R=yangguo@chromium.org,cbruni@chromium.org
BUG=chromium:588705
LOG=Y

Review-Url: https://codereview.chromium.org/1938663002
Cr-Commit-Position: refs/heads/master@{#35948}

src/runtime/runtime-debug.cc

@@ -273,6 +273,25 @@ MaybeHandle<JSArray> Runtime::GetInternalProperties(Isolate* isolate,
     result->set(2, *promise_value);
     result->set(3, *value_obj);
     return factory->NewJSArrayWithElements(result);
+  } else if (object->IsJSProxy()) {
+    Handle<JSProxy> js_proxy = Handle<JSProxy>::cast(object);
+    Handle<FixedArray> result = factory->NewFixedArray(3 * 2);
+
+    Handle<String> handler_str =
+        factory->NewStringFromAsciiChecked("[[Handler]]");
+    result->set(0, *handler_str);
+    result->set(1, js_proxy->handler());
+
+    Handle<String> target_str =
+        factory->NewStringFromAsciiChecked("[[Target]]");
+    result->set(2, *target_str);
+    result->set(3, js_proxy->target());
+
+    Handle<String> is_revoked_str =
+        factory->NewStringFromAsciiChecked("[[IsRevoked]]");
+    result->set(4, *is_revoked_str);
+    result->set(5, isolate->heap()->ToBoolean(js_proxy->IsRevoked()));
+    return factory->NewJSArrayWithElements(result);
   } else if (object->IsJSValue()) {
     Handle<JSValue> js_value = Handle<JSValue>::cast(object);
 

test/mjsunit/mirror-object.js

@@ -265,3 +265,27 @@ assertEquals(Number, property_map["[[TargetFunction]]"].value().value());
 assertTrue("[[BoundArgs]]" in property_map);
 assertEquals("object", property_map["[[BoundArgs]]"].value().type());
 assertEquals(1, property_map["[[BoundArgs]]"].value().value().length);
+
+// Test JSProxy internal properties.
+var target = {};
+var handler = {
+  get: function (target, name, receiver) {
+    return target[name];
+  },
+  set: function(target, name, value, receiver) {
+    target[name] = value;
+    return value;
+  }
+}
+ip = debug.ObjectMirror.GetInternalProperties(new Proxy(target, handler));
+assertEquals(3, ip.length);
+var property_map = {};
+for (var i = 0; i < ip.length; i++) {
+  property_map[ip[i].name()] = ip[i];
+}
+assertTrue("[[Target]]" in property_map);
+assertEquals(target, property_map["[[Target]]"].value().value());
+assertTrue("[[Handler]]" in property_map);
+assertEquals(handler, property_map["[[Handler]]"].value().value());
+assertTrue("[[IsRevoked]]" in property_map);
+assertEquals(false, property_map["[[IsRevoked]]"].value().value());