Adds chromium side plumbing to pass speech input calls back and forth with WebKit.

chrome/browser/speech/speech_input_dispatcher_host.h

+// Copyright (c) 2010 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_SPEECH_SPEECH_INPUT_DISPATCHER_HOST_H_
+#define CHROME_BROWSER_SPEECH_SPEECH_INPUT_DISPATCHER_HOST_H_
+
+#include "base/basictypes.h"
+#include "base/ref_counted.h"
+#include "base/scoped_ptr.h"
+#include "ipc/ipc_message.h"
+#include "speech_input_manager.h"
+
+namespace speech_input {
+
+// SpeechInputDispatcherHost is a delegate for Speech API messages used by
+// ResourceMessageFilter.
+// It's the complement of SpeechInputDispatcher (owned by RenderView).
+class SpeechInputDispatcherHost
+    : public base::RefCountedThreadSafe<SpeechInputDispatcherHost>,
+      public SpeechInputManager::Listener {
+ public:
+  explicit SpeechInputDispatcherHost(int resource_message_filter_process_id);
+
+  // SpeechInputManager::Listener methods.
+  void SetRecognitionResult(int render_view_id, const string16& result);
+  void DidCompleteRecording(int render_view_id);
+  void DidCompleteRecognition(int render_view_id);
+
+  // Called to possibly handle the incoming IPC message. Returns true if
+  // handled.
+  bool OnMessageReceived(const IPC::Message& msg, bool* msg_was_ok);
+
+  // Factory setter useful for tests.
+  static void set_manager_factory(SpeechInputManager::FactoryMethod* factory) {
+    manager_factory_ = factory;
+  }
+
+ private:
+  friend class base::RefCountedThreadSafe<SpeechInputDispatcherHost>;
+  virtual ~SpeechInputDispatcherHost();
+  void SendMessageToRenderView(IPC::Message* message, int render_view_id);
+
+  void OnStartRecognition(int render_view_id);
+  void OnCancelRecognition(int render_view_id);
+  void OnStopRecording(int render_view_id);
+
+  // Returns the speech input manager to forward events to, creating one if
+  // needed.
+  SpeechInputManager* manager();
+
+  int resource_message_filter_process_id_;
+
+  scoped_ptr<SpeechInputManager> manager_;
+
+  // Set to non-NULL if overridden in tests, in which case this is used in
+  // place of the default factory method.

[bulach, 2010/08/04 19:29:05]

obsolete comment?

+  static SpeechInputManager::FactoryMethod* manager_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(SpeechInputDispatcherHost);
+};
+
+}  // namespace speech_input
+
+#endif  // CHROME_BROWSER_SPEECH_SPEECH_INPUT_DISPATCHER_HOST_H_