Texture provider to feed data to the impl side thread for webview compositing.

content/renderer/browser_plugin/browser_plugin_compositing_filter.h

+// 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.
+
+#ifndef CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_COMPOSITING_FILTER_H_
+#define CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_COMPOSITING_FILTER_H_
+
+#include <set>
+
+#include "base/bind.h"
+#include "base/callback_forward.h"
+#include "base/task_runner.h"
+#include "ipc/ipc_channel_proxy.h"
+
+namespace content {
+
+// This class allows forwarding of the compositing messages associated
+// with browser plugin to the respective handler on the impl thread
+class BrowserPluginCompositingFilter
+  : public IPC::ChannelProxy::MessageFilter {
+ public:
+
+  typedef base::Callback<void(const IPC::Message&)> Handler;
+
+  BrowserPluginCompositingFilter(base::TaskRunner* target_task_runner,
+                                 int instance_id,
+                                 const Handler& handler);
+
+  // ChannelProxy::MessageFilter methods:
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
+ private:
+  friend class IPC::ChannelProxy::MessageFilter;
+  virtual ~BrowserPluginCompositingFilter();
+
+  int GetPluginInstanceID(const IPC::Message& message);
+
+  // Message ID's the class knows how to handle
+  std::set<int> message_ids_to_filter_;
+
+  // The handler_ only gets Run on the thread corresponding to
+  // target_task_runner_.
+  scoped_refptr<base::TaskRunner> target_task_runner_;
+
+  // Only handle messages for a specific browser plugin instance
+  int instance_id_;
+  Handler handler_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserPluginCompositingFilter);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_COMPOSITING_FILTER_H_