Add a public content/ interface for intents. Use it.

content/public/browser/intents_host.h

+// Copyright (c) 2011 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_BROWSER_INTENTS_HOST_H_
+#define CONTENT_PUBLIC_BROWSER_INTENTS_HOST_H_
+
+#include "base/callback.h"
+#include "webkit/glue/web_intent_reply_data.h"
+
+namespace webkit_glue {
+struct WebIntentData;
+}
+
+namespace content {
+
+// This class is the coordinator for dispatching web intents and seeing that
+// return messages are sent to the correct invoking context. The TabContents
+// for the invoking context will create one of these for each intent and hand
+// ownership to the client TabContentsDelegate code. The TabContentsDelegate
+// code can then read the intent data, create UI to pick the service, and
+// create a new context for that service. At that point, it should call
+// DispatchIntent, which will connect the object to the new context.
+class CONTENT_EXPORT IntentsHost {
+ public:
+  virtual ~IntentsHost() {}
+
+  // Get the intent data being dispatched.
+  virtual const webkit_glue::WebIntentData& intent() = 0;

[jam, 2011/11/23 21:00:00]

nit: chrome style is to use CamelCaps for virtual functions, so this should be
GetIntent()

[Greg Billock, 2011/11/24 00:42:13]

Done.

+
+  // Attach the intent to a new context in which the service is loaded.
+  virtual void DispatchIntent(TabContents* tab_contents) = 0;
+
+  // Return a success or failure message to the source context which invoked
+  // the intent.
+  virtual void SendReplyMessage(webkit_glue::WebIntentReplyType reply_type,
+                                  const string16& data) = 0;
+
+  // Register a callback to be notified when SendReplyMessage is called.
+  virtual void RegisterReplyNotification(const base::Closure& closure) = 0;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_INTENTS_HOST_H_