Add a row in the network tray to inform users to turn Bluetooth on to enable Tether.

ash/system/tray/tray_info_label.cc

Index: ash/system/tray/tray_info_label.cc
diff --git a/ash/system/tray/tray_info_label.cc b/ash/system/tray/tray_info_label.cc
new file mode 100644
index 0000000000000000000000000000000000000000..bd71a7690df1c12ae53705e104cb94bb0eebf3fd
--- /dev/null
+++ b/ash/system/tray/tray_info_label.cc
@@ -0,0 +1,77 @@
+// Copyright 2017 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/system/tray/tray_info_label.h"
+
+#include "ash/system/tray/tray_popup_item_style.h"
+#include "ash/system/tray/tray_popup_utils.h"
+#include "ui/accessibility/ax_node_data.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/views/layout/fill_layout.h"
+
+namespace ash {
+
+TrayInfoLabel::TrayInfoLabel(TrayInfoLabel::Delegate* delegate, int message_id)
+    : ActionableView(nullptr /* owner */, TrayPopupInkDropStyle::FILL_BOUNDS),
+      label_(TrayPopupUtils::CreateDefaultLabel()),
+      message_id_(message_id),
+      delegate_(delegate) {
+  SetLayoutManager(new views::FillLayout);
+
+  TriView* tri_view = TrayPopupUtils::CreateMultiTargetRowView();
+  tri_view->SetInsets(gfx::Insets(0,
+                                  kMenuExtraMarginFromLeftEdge +
+                                      kTrayPopupPaddingHorizontal -
+                                      kTrayPopupLabelHorizontalPadding,
+                                  0, kTrayPopupPaddingHorizontal));
+  tri_view->SetContainerVisible(TriView::Container::START, false);
+  tri_view->SetContainerVisible(TriView::Container::END, false);
+  tri_view->AddView(TriView::Container::CENTER, label_);
+
+  AddChildView(tri_view);
+
+  Update(message_id);
+}
+
+void TrayInfoLabel::Update(int message_id) {
+  message_id_ = message_id;
+
+  TrayPopupItemStyle::FontStyle font_style;
+
+  if (IsClickable()) {
+    SetInkDropMode(InkDropHostView::InkDropMode::ON);
+    font_style = TrayPopupItemStyle::FontStyle::CLICKABLE_SYSTEM_INFO;
+  } else {
+    SetInkDropMode(InkDropHostView::InkDropMode::OFF);
+    font_style = TrayPopupItemStyle::FontStyle::SYSTEM_INFO;
+  }
+
+  const TrayPopupItemStyle style(font_style);
+  style.SetupLabel(label_);
+
+  label_->SetText(l10n_util::GetStringUTF16(message_id));
+}
+
+bool TrayInfoLabel::PerformAction(const ui::Event& event) {
+  if (IsClickable()) {
+    delegate_->OnLabelClicked(message_id_);
+    return true;
+  }
+  return false;
+}
+
+void TrayInfoLabel::GetAccessibleNodeData(ui::AXNodeData* node_data) {
+  if (IsClickable())
+    node_data->role = ui::AX_ROLE_BUTTON;
+  else
+    node_data->role = ui::AX_ROLE_LABEL_TEXT;
+}
+
+bool TrayInfoLabel::IsClickable() {
+  if (delegate_)
+    return delegate_->IsLabelClickable(message_id_);
+  return false;
+}
+
+}  // namespace ash