Add WebContentsPrefrences class

atom/browser/web_contents_preferences.cc

@@ -0,0 +1,25 @@
+// Copyright (c) 2015 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/web_contents_preferences.h"
+
+namespace atom {
+
+namespace {
+
+const char* kWebPreferencesKey = "WebContentsPreferences";
+
+}  // namespace
+
+WebContentsPreferences::WebContentsPreferences(
+    content::WebContents* web_contents,
+    base::DictionaryValue&& web_preferences) {
+  web_preferences_.Swap(&web_preferences);
+  web_contents->SetUserData(kWebPreferencesKey, this);
+}
+
+WebContentsPreferences::~WebContentsPreferences() {
+}
+
+}  // namespace atom