[Extensions Bindings] Add native declarativeContent verification

extensions/renderer/declarative_content_hooks_delegate.h

Index: extensions/renderer/declarative_content_hooks_delegate.h
diff --git a/extensions/renderer/declarative_content_hooks_delegate.h b/extensions/renderer/declarative_content_hooks_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..8fd200c69e003cbbc09fc471f1a87d1da584bc85
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+++ b/extensions/renderer/declarative_content_hooks_delegate.h
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+// Copyright 2017 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.
+
+#ifndef EXTENSIONS_RENDERER_DECLARATIVE_CONTENT_HOOKS_DELEGATE_H_
+#define EXTENSIONS_RENDERER_DECLARATIVE_CONTENT_HOOKS_DELEGATE_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "extensions/renderer/api_binding_hooks_delegate.h"
+#include "v8/include/v8.h"
+
+namespace extensions {
+class APITypeReferenceMap;
+class ArgumentSpec;
+
+// Custom hooks for the declarativeContent API.
+class DeclarativeContentHooksDelegate : public APIBindingHooksDelegate {
+ public:
+  // The callback type for handling an API call.
+  using HandlerCallback =
+      base::Callback<void(const v8::FunctionCallbackInfo<v8::Value>&)>;
+
+  DeclarativeContentHooksDelegate();
+  ~DeclarativeContentHooksDelegate() override;
+
+  void InitializeTemplate(v8::Isolate* isolate,
+                          v8::Local<v8::ObjectTemplate> object_template,
+                          const APITypeReferenceMap& type_refs) override;
+
+ private:
+  void HandleCall(const ArgumentSpec* spec,
+                  const APITypeReferenceMap* type_refs,
+                  const std::string& type_name,
+                  const v8::FunctionCallbackInfo<v8::Value>& info);
+
+  // The owned callbacks for the constructor functions. Since these pointers
+  // are passed to v8::External, we need to use unique_ptrs rather than just
+  // storing the callback directly in a vector.
+  std::vector<std::unique_ptr<HandlerCallback>> callbacks_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeclarativeContentHooksDelegate);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_RENDERER_DECLARATIVE_CONTENT_HOOKS_DELEGATE_H_