Browser Plugin: Implement BrowserPluginObserver.

content/public/renderer/browser_plugin/browser_plugin_method_binding.h

+// 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.
+
+#ifndef CONTENT_PUBLIC_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_METHOD_BINDING_H_
+#define CONTENT_PUBLIC_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_METHOD_BINDING_H_
+
+#include <string>
+
+#include "content/common/content_export.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebBindings.h"
+
+namespace content {
+
+class BrowserPlugin;
+
+// A BrowserPluginMethodBinding is an interface that can be implemented to
+// define a method that can be tied to a BrowserPlugin object. This property
+// can be added to a particular instance of BrowserPlugin through
+// BrowserPlugin::AddMethodBinding.
+class CONTENT_EXPORT BrowserPluginMethodBinding {
+ public:
+  virtual ~BrowserPluginMethodBinding() {}
+
+  // Returns the name of the method.
+  virtual const std::string& GetName() const = 0;
+
+  // Returns the number of arguments expected by the method.
+  virtual uint32 GetArgCount() const = 0;
+
+  // Executes the method on |browser_plugin| with the provided |args|.
+  // The return value is stored in |result|.
+  virtual bool Invoke(const NPVariant* args, NPVariant* result) = 0;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_METHOD_BINDING_H_