Allow platform apps to respond to Web Intents

chrome/browser/extensions/web_intent_callbacks.h

Index: chrome/browser/extensions/web_intent_callbacks.h
diff --git a/chrome/browser/extensions/web_intent_callbacks.h b/chrome/browser/extensions/web_intent_callbacks.h
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+// 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 CHROME_BROWSER_EXTENSIONS_WEB_INTENT_CALLBACKS_H_
+#define CHROME_BROWSER_EXTENSIONS_WEB_INTENT_CALLBACKS_H_
+
+#include "base/memory/singleton.h"
+#include "chrome/browser/profiles/profile_keyed_service.h"
+#include "chrome/browser/profiles/profile_keyed_service_factory.h"
+
+class Profile;
+
+namespace content {
+class WebContents;
+class WebIntentsDispatcher;
+}
+
+namespace extensions {
+class Extension;
+
+// The WebIntentCallbacks class tracks the pending callbacks for web intents
+// that have been delivered to packaged apps (i.e., new-style apps containing
+// shell windows), for a particular profile.
+class WebIntentCallbacks : public ProfileKeyedService {
+ public:
+  WebIntentCallbacks();
+  virtual ~WebIntentCallbacks();
+
+  // Returns the instance for the given profile. This is a convenience wrapper
+  // around WebIntentCallbacks::Factory::GetForProfile.
+  static WebIntentCallbacks* Get(Profile* profile);
+
+  // Registers the callback for the Web Intent we're about to dispatch to the
+  // given extension. Returns an identifier that should later be dispatched to
+  // RetrieveCallback in order to invoke the callback registered here.
+  // This transfers ownership of WebIntentsDispatcher to this class.
+  int RegisterCallback(const Extension* extension,
+                       content::WebIntentsDispatcher* dispatcher,
+                       content::WebContents* source);
+
+  // Retrieves the callback for the given identifier, for a response from the
+  // specified extension. This will clear the callback. If there is no callback
+  // registered under this identifier, then this will return NULL. This
+  // transfers ownership of WebIntentsDispatcher to the caller.
+  content::WebIntentsDispatcher* RetrieveCallback(const Extension* extension,
+                                                  int intent_id);
+
+ private:
+  typedef std::map<std::string, content::WebIntentsDispatcher*> CallbackMap;
+
+  class Factory : public ProfileKeyedServiceFactory {
+   public:
+    static WebIntentCallbacks* GetForProfile(Profile* profile);
+
+    static Factory* GetInstance();
+   private:
+    friend struct DefaultSingletonTraits<Factory>;
+
+    Factory();
+    virtual ~Factory();
+
+    // ProfileKeyedServiceFactory
+    virtual ProfileKeyedService* BuildServiceInstanceFor(
+        Profile* profile) const OVERRIDE;
+  };
+
+  // Private method to get and clear the dispatcher for the given string key.
+  // If there is no dispatcher available, this will return NULL. Otherwise, this
+  // transfers ownership of the WebIntentsDispatcher to the caller.
+  content::WebIntentsDispatcher* GetAndClear(std::string key);
+
+  class SourceObserver;
+
+  // Used as an incrementing ID for callback keys.
+  int last_id_;
+
+  // Stores all pending callbacks sent to platform apps.
+  CallbackMap pending_;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_WEB_INTENT_CALLBACKS_H_