Ash Tray: Do not show "Toggle Bluetooth" in tooltip if the button is disabled.

The Bluetooth FeaturePod button can be disabled in certain cases (e.g. when the
screen is locked) so the current "Toggle Bluetooth" and "Show Bluetooth
settings" tooltips are not appropriate.

BUG=987933

Change-Id: I2d534f3e99525847a1e4164e510996bd90b0a096
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1729565Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Commit-Queue: Tim Song <tengs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683303}

ash/system/bluetooth/bluetooth_feature_pod_controller.cc

@@ -144,10 +144,17 @@ void BluetoothFeaturePodController::UpdateButton() {
 
 void BluetoothFeaturePodController::SetTooltipState(
     const base::string16& tooltip_state) {
-  button_->SetIconTooltip(l10n_util::GetStringFUTF16(
-      IDS_ASH_STATUS_TRAY_BLUETOOTH_TOGGLE_TOOLTIP, tooltip_state));
-  button_->SetLabelTooltip(l10n_util::GetStringFUTF16(
-      IDS_ASH_STATUS_TRAY_BLUETOOTH_SETTINGS_TOOLTIP, tooltip_state));
+  if (button_->GetEnabled()) {
+    button_->SetIconTooltip(l10n_util::GetStringFUTF16(
+        IDS_ASH_STATUS_TRAY_BLUETOOTH_TOGGLE_TOOLTIP, tooltip_state));
+    button_->SetLabelTooltip(l10n_util::GetStringFUTF16(
+        IDS_ASH_STATUS_TRAY_BLUETOOTH_SETTINGS_TOOLTIP, tooltip_state));
+  } else {
+    // Do not show "Toggle" text in tooltip when the button is disabled (e.g.
+    // when the screen is locked or for secondary users).
+    button_->SetIconTooltip(tooltip_state);
+    button_->SetLabelTooltip(tooltip_state);
+  }
 }
 
 void BluetoothFeaturePodController::OnBluetoothSystemStateChanged() {