[a11y] Announce network connection status in tray.

When navigating through the network list in quick settings, announce
the connection status of the highlighted network when available.

Bug: 1006005
Change-Id: Ib2a640af72742817118dea76e2b210e12180bff0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879435
Commit-Queue: Jon Mann <jonmann@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710457}

ash/ash_strings.grd

@@ -877,6 +877,9 @@ This file contains the strings for ash.
       <message name="IDS_ASH_STATUS_TRAY_NETWORK" desc="The label used in the network dialog header.">
         Network
       </message>
+      <message name="IDS_ASH_STATUS_TRAY_NETWORK_ACCESSIBILITY_LABEL" desc="Accessibility label for a network in the quick settings network list, to be read outloud by a screenreader or braile console.">
+        <ph name="NETWORK_NAME">$1<ex>GuestNetwork</ex></ph> - <ph name="CONNECTION_STATUS">$2<ex>Connecting</ex></ph>
+      </message>
       <message name="IDS_ASH_STATUS_TRAY_NETWORK_STATUS_CONNECTED" desc="The label used when a network connection is connected.">
         Connected
       </message>

ash/system/tray/tray_detailed_view.cc

@@ -362,25 +362,37 @@ void TrayDetailedView::SetupConnectedScrollListItem(
     base::Optional<uint8_t> battery_percentage) {
   DCHECK(view->is_populated());
 
+  base::string16 status;
+
   if (battery_percentage) {
-    view->SetSubText(l10n_util::GetStringFUTF16(
+    status = l10n_util::GetStringFUTF16(
         IDS_ASH_STATUS_TRAY_BLUETOOTH_DEVICE_CONNECTED_WITH_BATTERY_LABEL,
-        base::NumberToString16(battery_percentage.value())));
+        base::NumberToString16(battery_percentage.value()));
   } else {
-    view->SetSubText(l10n_util::GetStringUTF16(
-        IDS_ASH_STATUS_TRAY_NETWORK_STATUS_CONNECTED));
+    status =
+        l10n_util::GetStringUTF16(IDS_ASH_STATUS_TRAY_NETWORK_STATUS_CONNECTED);
   }
+  view->SetSubText(status);
 
   TrayPopupItemStyle style(TrayPopupItemStyle::FontStyle::CAPTION);
   style.set_color_style(TrayPopupItemStyle::ColorStyle::CONNECTED);
   style.SetupLabel(view->sub_text_label());
+
+  view->SetAccessibleName(l10n_util::GetStringFUTF16(
+      IDS_ASH_STATUS_TRAY_NETWORK_ACCESSIBILITY_LABEL,
+      view->text_label()->GetText(), status));
 }
 
 void TrayDetailedView::SetupConnectingScrollListItem(HoverHighlightView* view) {
   DCHECK(view->is_populated());
 
-  view->SetSubText(
-      l10n_util::GetStringUTF16(IDS_ASH_STATUS_TRAY_NETWORK_STATUS_CONNECTING));
+  base::string16 status =
+      l10n_util::GetStringUTF16(IDS_ASH_STATUS_TRAY_NETWORK_STATUS_CONNECTING);
+
+  view->SetSubText(status);
+  view->SetAccessibleName(l10n_util::GetStringFUTF16(
+      IDS_ASH_STATUS_TRAY_NETWORK_ACCESSIBILITY_LABEL,
+      view->text_label()->GetText(), status));
 }
 
 TriView* TrayDetailedView::AddScrollListSubHeader(const gfx::VectorIcon& icon,

ash/system/tray/tray_detailed_view.h

@@ -89,15 +89,17 @@ class ASH_EXPORT TrayDetailedView : public views::View,
       bool checked,
       bool enterprise_managed = false);
 
-  // Adds connected sub label to the |view| with appropriate style.
+  // Adds connected sub label to the |view| with appropriate style and updates
+  // accessibility label.
   void SetupConnectedScrollListItem(HoverHighlightView* view);
 
   // Adds connected sub label with the device's battery percentage to the |view|
-  // with appropriate style.
+  // with appropriate style and updates accessibility label.
   void SetupConnectedScrollListItem(HoverHighlightView* view,
                                     base::Optional<uint8_t> battery_percentage);
 
-  // Adds connecting sub label to the |view| with appropriate style.
+  // Adds connecting sub label to the |view| with appropriate style and updates
+  // accessibility label.
   void SetupConnectingScrollListItem(HoverHighlightView* view);
 
   // Adds a sticky sub header to |scroll_content_| containing |icon| and a text