Add ImeMenuTray element.

ash/common/system/chromeos/ime_menu/ime_menu_tray.cc

+// Copyright 2016 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 "ash/common/system/chromeos/ime_menu/ime_menu_tray.h"
+
+#include "ash/common/system/tray/system_tray_notifier.h"
+#include "ash/common/system/tray/tray_constants.h"
+#include "ash/common/system/tray/tray_utils.h"
+#include "ash/common/wm_shell.h"
+#include "ash/common/wm_window.h"
+#include "base/strings/utf_string_conversions.h"
+#include "grit/ash_strings.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/views/controls/label.h"
+
+namespace ash {
+
+namespace {
+
+class ImeMenuLabel : public views::Label {
+ public:
+  ImeMenuLabel() {}
+  ~ImeMenuLabel() override {}
+
+  // views:Label:
+  gfx::Size GetPreferredSize() const override {
+    return gfx::Size(kTrayImeIconSize, kTrayImeIconSize);
+  }
+  int GetHeightForWidth(int width) const override {
+    return GetPreferredSize().height();

[James Cook, 2016/07/14 15:47:35]

nit: just return kTrayImeIconSize

[Azure Wei, 2016/07/15 01:58:12]

Done.

+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ImeMenuLabel);
+};
+
+}  // namespace
+
+ImeMenuTray::ImeMenuTray(WmShelf* wm_shelf)
+    : TrayBackgroundView(wm_shelf), label_(new ImeMenuLabel()) {
+  SetupLabelForTray(label_);
+  tray_container()->AddChildView(label_);
+  SetContentsBackground();
+  WmShell::Get()->system_tray_notifier()->AddIMEObserver(this);
+}
+
+ImeMenuTray::~ImeMenuTray() {
+  WmShell::Get()->system_tray_notifier()->RemoveIMEObserver(this);
+}
+
+void ImeMenuTray::SetShelfAlignment(ShelfAlignment alignment) {
+  TrayBackgroundView::SetShelfAlignment(alignment);
+  tray_container()->SetBorder(views::Border::NullBorder());
+}
+
+base::string16 ImeMenuTray::GetAccessibleNameForTray() {
+  return l10n_util::GetStringUTF16(IDS_ASH_IME_MENU_ACCESSIBLE_NAME);
+}
+
+void ImeMenuTray::HideBubbleWithView(const views::TrayBubbleView* bubble_view) {
+}
+
+void ImeMenuTray::ClickedOutsideBubble() {}
+
+bool ImeMenuTray::PerformAction(const ui::Event& event) {
+  SetTrayActivation(!draw_background_as_active());
+  return true;
+}
+
+void ImeMenuTray::OnIMERefresh() {
+  UpdateTrayLabel();
+}
+
+void ImeMenuTray::OnIMEMenuActivationChanged(bool is_activated) {
+  SetVisible(is_activated);
+  if (is_activated)
+    UpdateTrayLabel();
+  else
+    SetTrayActivation(false);
+}
+
+void ImeMenuTray::UpdateTrayLabel() {
+  WmShell::Get()->system_tray_delegate()->GetCurrentIME(&current_ime_);
+
+  // Updates the tray label based on the current input method.
+  if (current_ime_.third_party)
+    label_->SetText(current_ime_.short_name + base::UTF8ToUTF16("*"));
+  else
+    label_->SetText(current_ime_.short_name);
+}
+
+void ImeMenuTray::SetTrayActivation(bool is_active_) {

[James Cook, 2016/07/14 15:47:35]

as above, is_active_ -> is_active

[Azure Wei, 2016/07/15 01:58:12]

Done.

+  SetDrawBackgroundAsActive(is_active_);
+  // TODO(azurewei): Shows/hides the IME menu tray bubble based on |is_active_|.
+}
+
+}  // namespace ash