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

ash/system/tray/tray_details_view.cc

Index: ash/system/tray/tray_details_view.cc
diff --git a/ash/system/tray/tray_details_view.cc b/ash/system/tray/tray_details_view.cc
index f4507f0779185c5f8924c021d5a87d7975fa7729..116658ca7f05176f018bbd3c6cabb9a89a0c93c1 100644
--- a/ash/system/tray/tray_details_view.cc
+++ b/ash/system/tray/tray_details_view.cc
@@ -5,10 +5,12 @@
 #include "ash/system/tray/tray_details_view.h"
 
 #include "ash/ash_view_ids.h"
+#include "ash/shell.h"
 #include "ash/strings/grit/ash_strings.h"
 #include "ash/system/tray/hover_highlight_view.h"
 #include "ash/system/tray/system_menu_button.h"
 #include "ash/system/tray/system_tray.h"
+#include "ash/system/tray/system_tray_controller.h"
 #include "ash/system/tray/system_tray_item.h"
 #include "ash/system/tray/tray_constants.h"
 #include "ash/system/tray/tray_popup_item_style.h"
@@ -240,13 +242,16 @@ const int kTitleRowPaddingBottom =
 ////////////////////////////////////////////////////////////////////////////////
 // TrayDetailsView::InfoLabel:
 
-TrayDetailsView::InfoLabel::InfoLabel(int message_id)
-    : label_(TrayPopupUtils::CreateDefaultLabel()) {
+TrayDetailsView::InfoLabel::InfoLabel(int message_id) {

[Kyle Horimoto, 2017/07/07 17:33:59]

Nothing is actually done with |message_id|.

[lesliewatkins, 2017/07/09 00:57:47]

Acknowledged.

   SetLayoutManager(new views::FillLayout);
+}
 
-  TrayPopupItemStyle style(TrayPopupItemStyle::FontStyle::SYSTEM_INFO);
-  style.SetupLabel(label_);
+////////////////////////////////////////////////////////////////////////////////
+// TrayDetailsView::InfoLabelNoAction:
 
+TrayDetailsView::InfoLabelNoAction::InfoLabelNoAction(int message_id)
+    : TrayDetailsView::InfoLabel(message_id),
+      label_(TrayPopupUtils::CreateDefaultLabel()) {
   TriView* tri_view = TrayPopupUtils::CreateMultiTargetRowView();
   tri_view->SetInsets(gfx::Insets(0,
                                   kMenuExtraMarginFromLeftEdge +
@@ -256,20 +261,71 @@ TrayDetailsView::InfoLabel::InfoLabel(int message_id)
   tri_view->SetContainerVisible(TriView::Container::START, false);
   tri_view->SetContainerVisible(TriView::Container::END, false);
   tri_view->AddView(TriView::Container::CENTER, label_);
+
   AddChildView(tri_view);
 
+  TrayPopupItemStyle::FontStyle font_style =
+      TrayPopupItemStyle::FontStyle::SYSTEM_INFO;
+
+  TrayPopupItemStyle style(font_style);
+  style.SetupLabel(label_);
+
   SetMessage(message_id);
 }
 
-TrayDetailsView::InfoLabel::~InfoLabel() {}
-
-void TrayDetailsView::InfoLabel::SetMessage(int message_id) {
+void TrayDetailsView::InfoLabelNoAction::SetMessage(int message_id) {
   label_->SetText(l10n_util::GetStringUTF16(message_id));
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// TrayDetailsView::BluetoothInfoLabel:
+
+TrayDetailsView::InfoLabelEnableBluetooth::InfoLabelEnableBluetooth(
+    int message_id)
+    : TrayDetailsView::InfoLabel(message_id),
+      label_button_(
+          new views::LabelButton(this, l10n_util::GetStringUTF16(message_id))) {
+  TriView* tri_view = TrayPopupUtils::CreateMultiTargetRowView();

[Kyle Horimoto, 2017/07/07 17:33:59]

AFAICT, this is the same code as in the label class you created above, up to the
|label_button_| part. You should consolidate this.

+  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_button_);
+
+  AddChildView(tri_view);
+
+  label_button_->SetEnabledTextColors(
+      label_button_->GetNativeTheme()->GetSystemColor(
+          ui::NativeTheme::kColorId_ProminentButtonColor));
+  label_button_->SetInkDropMode(views::InkDropHostView::InkDropMode::ON);
+  label_button_->set_ink_drop_base_color(kTrayPopupInkDropBaseColor);
+
+  SetMessage(message_id);
+}
+
+void TrayDetailsView::InfoLabelEnableBluetooth::SetMessage(int message_id) {
+  label_button_->SetText(l10n_util::GetStringUTF16(message_id));
+}
+
+void TrayDetailsView::InfoLabelEnableBluetooth::ButtonPressed(
+    views::Button* button,
+    const ui::Event& event) {
+  Shell::Get()->system_tray_controller()->ShowBluetoothSettings();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // TrayDetailsView:
 
+TrayDetailsView::InfoLabel* TrayDetailsView::CreateInfoLabel(int message_id) {
+  if (message_id == IDS_ASH_STATUS_TRAY_ENABLE_BLUETOOTH)
+    return new InfoLabelEnableBluetooth(message_id);
+
+  return new InfoLabelNoAction(message_id);
+}
+
 TrayDetailsView::TrayDetailsView(SystemTrayItem* owner)
     : owner_(owner),
       box_layout_(new views::BoxLayout(views::BoxLayout::kVertical)),