Enable posting a message from JS to Android webview.

android_webview/renderer/aw_message_port_client.h

Index: android_webview/renderer/aw_message_port_client.h
diff --git a/android_webview/renderer/aw_message_port_client.h b/android_webview/renderer/aw_message_port_client.h
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+++ b/android_webview/renderer/aw_message_port_client.h
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+// Copyright 2014 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 ANDROID_WEBVIEW_RENDERER_AW_MESSAGE_PORT_CLIENT_H_
+#define ANDROID_WEBVIEW_RENDERER_AW_MESSAGE_PORT_CLIENT_H_
+
+#include <vector>
+
+#include "base/strings/string16.h"
+#include "content/public/renderer/render_frame_observer.h"
+
+namespace android_webview {
+
+// Renderer side of Android webview specific message port service. This service
+// is used to convert messages from WebSerializedScriptValue to a base value.
+class AwMessagePortClient : public content::RenderFrameObserver {
+ public:
+  explicit AwMessagePortClient(content::RenderFrame* render_frame);
+
+ private:
+  virtual ~AwMessagePortClient();
+
+  // RenderFrame::Observer
+  bool OnMessageReceived(const IPC::Message& message) override;
+
+  void OnPostMessage(int message_port_id,
+                     const base::string16& message,
+                     const std::vector<int>& sent_message_port_ids);
+  DISALLOW_COPY_AND_ASSIGN(AwMessagePortClient);
+};
+
+}
+
+#endif  // ANDROID_WEBVIEW_RENDERER_AW_MESSAGE_PORT_CLIENT_H_