Introduce IBusBridge for ibus-less implementation.

chromeos/ime/ibus_bridge.cc

+// 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.
+
+#include "chromeos/ime/ibus_bridge.h"
+
+#include "base/logging.h"
+#include "base/threading/thread_local_storage.h"
+
+namespace chromeos {
+
+namespace {
+
+// Thread local storage for IBusBridge.
+base::ThreadLocalStorage::StaticSlot tls_ibus_bridge = TLS_INITIALIZER;
+
+// Handles TLS finalization.
+void Finalize(void* data) {
+  IBusBridge* bridge = static_cast<IBusBridge*>(data);
+  delete bridge;
+}
+
+}  // namespace
+
+///////////////////////////////////////////////////////////////////////////////
+// IBusBridge
+
+IBusBridge::IBusBridge()
+  : input_context_handler_(NULL),
+    engine_handler_(NULL),
+    candidate_window_handler_(NULL),
+    panel_handler_(NULL) {
+}
+
+// static
+void IBusBridge::Initialize() {
+  tls_ibus_bridge.Initialize(Finalize);
+  IBusBridge* bridge = new IBusBridge();
+  tls_ibus_bridge.Set(bridge);
+}
+
+// static
+IBusBridge* GetInstance() {
+  if (!tls_ibus_bridge.initialized())
+    return NULL;
+  return static_cast<IBusBridge*>(tls_ibus_bridge.Get());
+}
+
+}  // namespace chromeos