Implement API features for the Extension API feature system

chrome/common/extensions/features/api_feature.cc

Index: chrome/common/extensions/features/api_feature.cc
diff --git a/chrome/common/extensions/features/api_feature.cc b/chrome/common/extensions/features/api_feature.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3cdbcfdd1343c9279fa9140edb3334393d2e0520
--- /dev/null
+++ b/chrome/common/extensions/features/api_feature.cc
@@ -0,0 +1,26 @@
+// 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 "chrome/common/extensions/features/api_feature.h"
+
+namespace extensions {
+
+APIFeature::APIFeature() {
+}
+
+APIFeature::~APIFeature() {
+}
+
+bool APIFeature::Parse(const DictionaryValue* value) {
+  if (!SimpleFeature::Parse(value))
+    return false;
+
+  if (GetContexts()->empty()) {
+    LOG(ERROR) << name() << ": API features must specify at least one context.";
+    return false;
+  }
+  return true;
+}
+
+}  // namespace