Move the code in libcros' chromeos_speech_synthesis.cc into Chrome

chrome/browser/chromeos/dbus/dbus_thread_manager.h

Index: chrome/browser/chromeos/dbus/dbus_thread_manager.h
diff --git a/chrome/browser/chromeos/dbus/dbus_thread_manager.h b/chrome/browser/chromeos/dbus/dbus_thread_manager.h
index ffdeb7cc707632e161e1efe577d5a45af104cef1..32254034013a156cb9d1592876d8ed6e742067c6 100644
--- a/chrome/browser/chromeos/dbus/dbus_thread_manager.h
+++ b/chrome/browser/chromeos/dbus/dbus_thread_manager.h
@@ -23,6 +23,7 @@ class CrosDBusService;
 class PowerManagerClient;
 class SessionManagerClient;
 class SensorsSource;
+class SpeechSynthesizerClient;
 
 // DBusThreadManager manages the D-Bus thread, the thread dedicated to
 // handling asynchronous D-Bus operations.
@@ -73,6 +74,13 @@ class DBusThreadManager {
   void set_session_manager_client_for_testing(
       SessionManagerClient* session_manager_client);
 
+  // Returns the speech synthesizer client, owned by DBusThreadManager.
+  // Do not cache this pointer and use it after DBusThreadManager is shut
+  // down.
+  SpeechSynthesizerClient* speech_synthesizer_client() {
+    return speech_synthesizer_client_.get();
+  }
+
  private:
   DBusThreadManager();
   virtual ~DBusThreadManager();
@@ -83,6 +91,7 @@ class DBusThreadManager {
   scoped_ptr<SensorsSource> sensors_source_;
   scoped_ptr<PowerManagerClient> power_manager_client_;
   scoped_ptr<SessionManagerClient> session_manager_client_;
+  scoped_ptr<SpeechSynthesizerClient> speech_synthesizer_client_;
 
   DISALLOW_COPY_AND_ASSIGN(DBusThreadManager);
 };