Revert of chromeos: Remove some IME methods from ash::SystemTrayDelegate

chrome/browser/chromeos/input_method/input_method_switch_recorder.cc

Index: chrome/browser/chromeos/input_method/input_method_switch_recorder.cc
diff --git a/chrome/browser/chromeos/input_method/input_method_switch_recorder.cc b/chrome/browser/chromeos/input_method/input_method_switch_recorder.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2b8fdf442a8ff458b3f5b8ba5c921136b5f0cff3
--- /dev/null
+++ b/chrome/browser/chromeos/input_method/input_method_switch_recorder.cc
@@ -0,0 +1,48 @@
+// Copyright (c) 2014 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 "chrome/browser/chromeos/input_method/input_method_switch_recorder.h"
+
+#include "base/metrics/histogram_macros.h"
+
+namespace {
+
+chromeos::input_method::InputMethodSwitchRecorder*
+    g_input_method_switch_recorder = NULL;
+
+enum SwitchBy {
+  // The values should not reordered or deleted and new entries should only be
+  // added at the end (otherwise it will cause problems interpreting logs)
+  SWITCH_BY_TRAY = 0,
+  SWITCH_BY_ACCELERATOR = 1,
+  NUM_SWITCH_BY = 2
+};
+
+}  // namespace
+
+namespace chromeos {
+namespace input_method {
+
+// static
+InputMethodSwitchRecorder* InputMethodSwitchRecorder::Get() {
+  if (!g_input_method_switch_recorder)
+    g_input_method_switch_recorder = new InputMethodSwitchRecorder();
+  return g_input_method_switch_recorder;
+}
+
+InputMethodSwitchRecorder::InputMethodSwitchRecorder() {
+}
+
+InputMethodSwitchRecorder::~InputMethodSwitchRecorder() {
+}
+
+void InputMethodSwitchRecorder::RecordSwitch(bool by_tray_menu) {
+  UMA_HISTOGRAM_ENUMERATION(
+      "InputMethod.ImeSwitch",
+      by_tray_menu ? SWITCH_BY_TRAY : SWITCH_BY_ACCELERATOR, NUM_SWITCH_BY);
+}
+
+}  // namespace input_method
+}  // namespace chromeos
+