Add PPB_VarArray_Dev support - part 1.

ppapi/shared_impl/dictionary_var.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ppapi/shared_impl/dictionary_var.h"
 
 #include "base/memory/ref_counted.h"
 #include "base/string_util.h"
+#include "ppapi/shared_impl/array_var.h"
 #include "ppapi/shared_impl/ppapi_globals.h"
 #include "ppapi/shared_impl/var_tracker.h"
 
 namespace ppapi {
 
 DictionaryVar::DictionaryVar() {
 }
 
 DictionaryVar::~DictionaryVar() {
 }
@@ skipping 53 matching lines @@
   StringVar* string_var = StringVar::FromPPVar(key);
   if (!string_var)
     return PP_FALSE;
 
   bool result =
       key_value_map_.find(string_var->value()) != key_value_map_.end();
   return PP_FromBool(result);
 }
 
 PP_Var DictionaryVar::GetKeys() const {
-  // TODO(yzshen): Implement once array PP_Var is supported.
-  return PP_MakeNull();
+  scoped_refptr<ArrayVar> array_var(new ArrayVar());
+  array_var->elements().reserve(key_value_map_.size());
+
+  for (KeyValueMap::const_iterator iter = key_value_map_.begin();
+       iter != key_value_map_.end(); ++iter) {
+    array_var->elements().push_back(
+        ScopedPPVar(ScopedPPVar::PassRef(),
+                    StringVar::StringToPPVar(iter->first)));
+  }
+  return array_var->GetPPVar();
 }
 
 bool DictionaryVar::SetWithStringKey(const std::string& utf8_key,
                                      const PP_Var& value) {
   if (!IsStringUTF8(utf8_key))
     return false;
 
   key_value_map_[utf8_key] = value;
   return true;
 }
 
 void DictionaryVar::DeleteWithStringKey(const std::string& utf8_key) {
   key_value_map_.erase(utf8_key);
 }
 
 }  // namespace ppapi