Add a default constructor for VarArrayBuffer, so that it can be used by ext::DictField.

ppapi/cpp/var_array_buffer.cc

 // Copyright (c) 2012 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/cpp/var_array_buffer.h"
 
 #include <limits>
 
 #include "ppapi/c/ppb_var_array_buffer.h"
 #include "ppapi/cpp/logging.h"
 #include "ppapi/cpp/module_impl.h"
 
 namespace pp {
 
 namespace {
 
 template <> const char* interface_name<PPB_VarArrayBuffer_1_0>() {
   return PPB_VAR_ARRAY_BUFFER_INTERFACE_1_0;
 }
 
 }  // namespace
 
+VarArrayBuffer::VarArrayBuffer() {
+  ConstructWithSize(0);
+}
+
 VarArrayBuffer::VarArrayBuffer(const Var& var) : Var(var) {
   if (!var.is_array_buffer()) {
     PP_NOTREACHED();
     var_ = PP_MakeNull();
   }
 }
 
 VarArrayBuffer::VarArrayBuffer(uint32_t size_in_bytes) {
-  if (has_interface<PPB_VarArrayBuffer_1_0>()) {
-    var_ = get_interface<PPB_VarArrayBuffer_1_0>()->Create(size_in_bytes);
-  } else {
-    PP_NOTREACHED();
-    var_ = PP_MakeNull();
-  }
-  is_managed_ = true;
+  ConstructWithSize(size_in_bytes);
 }
 
 pp::VarArrayBuffer& VarArrayBuffer::operator=(const VarArrayBuffer& other) {
   Var::operator=(other);
   return *this;
 }
 
 pp::Var& VarArrayBuffer::operator=(const Var& other) {
   if (other.is_array_buffer()) {
     return Var::operator=(other);
@@ skipping 19 matching lines @@
   return NULL;
 }
 
 void VarArrayBuffer::Unmap() {
   if (is_array_buffer() && has_interface<PPB_VarArrayBuffer_1_0>())
     get_interface<PPB_VarArrayBuffer_1_0>()->Unmap(var_);
   else
     PP_NOTREACHED();
 }
 
+
+void VarArrayBuffer::ConstructWithSize(uint32_t size_in_bytes) {
+  PP_DCHECK(is_undefined());
+
+  if (has_interface<PPB_VarArrayBuffer_1_0>()) {
+    var_ = get_interface<PPB_VarArrayBuffer_1_0>()->Create(size_in_bytes);
+  } else {
+    PP_NOTREACHED();
+    var_ = PP_MakeNull();
+  }
+  is_managed_ = true;
+}
+
 }  // namespace pp