Add throbber and status text to WebBluetooth chooser UI on non-Mac desktops

chrome/browser/ui/bluetooth/bluetooth_chooser_controller.cc

Index: chrome/browser/ui/bluetooth/bluetooth_chooser_controller.cc
diff --git a/chrome/browser/ui/bluetooth/bluetooth_chooser_controller.cc b/chrome/browser/ui/bluetooth/bluetooth_chooser_controller.cc
index 173fc18848dd1fe1d4f904dd4b9abd51616ab0e2..5c0f2e410d7a1a390de43fb6129f3fe0596885d3 100644
--- a/chrome/browser/ui/bluetooth/bluetooth_chooser_controller.cc
+++ b/chrome/browser/ui/bluetooth/bluetooth_chooser_controller.cc
@@ -32,10 +32,16 @@ BluetoothChooserController::BluetoothChooserController(
     : ChooserController(owner,
                         IDS_BLUETOOTH_DEVICE_CHOOSER_PROMPT_ORIGIN,
                         IDS_BLUETOOTH_DEVICE_CHOOSER_PROMPT_EXTENSION_NAME),
-      event_handler_(event_handler) {}
+      event_handler_(event_handler),
+      no_devices_text_(l10n_util::GetStringUTF16(
+          IDS_DEVICE_CHOOSER_NO_DEVICES_FOUND_PROMPT)) {}
 
 BluetoothChooserController::~BluetoothChooserController() {}
 
+base::string16 BluetoothChooserController::GetNoOptionsText() const {
+  return no_devices_text_;
+}
+
 base::string16 BluetoothChooserController::GetOkButtonLabel() const {
   return l10n_util::GetStringUTF16(
       IDS_BLUETOOTH_DEVICE_CHOOSER_PAIR_BUTTON_TEXT);
@@ -57,6 +63,15 @@ base::string16 BluetoothChooserController::GetOption(size_t index) const {
                    base::UTF8ToUTF16(device_names_and_ids_[index].second));
 }
 
+void BluetoothChooserController::RefreshOptions() {
+  ClearAllDevices();
+  event_handler_.Run(content::BluetoothChooser::Event::RESCAN, std::string());
+}
+
+base::string16 BluetoothChooserController::GetStatus() const {
+  return status_text_;
+}
+
 void BluetoothChooserController::Select(size_t index) {
   DCHECK_LT(index, device_names_and_ids_.size());
   event_handler_.Run(content::BluetoothChooser::Event::SELECTED,
@@ -80,6 +95,49 @@ void BluetoothChooserController::OpenHelpCenterUrl() const {
       false /* is_renderer_initialized */));
 }
 
+void BluetoothChooserController::UpdateAdapterPresence(
+    content::BluetoothChooser::AdapterPresence presence) {
+  ClearAllDevices();
+  switch (presence) {
+    case content::BluetoothChooser::AdapterPresence::ABSENT:

[msw, 2016/07/18 23:01:30]

Should this case send observer()->AdapterEnabled(false)?

[juncai, 2016/07/19 20:42:46]

When there is no Bluetooth adapter, the Bluetooth chooser won't show up. So this
line of code won't be reached. Maybe add a NOTREACHED();?

[msw, 2016/07/19 22:08:10]

Acknowledged.

+      break;
+    case content::BluetoothChooser::AdapterPresence::POWERED_OFF:
+      no_devices_text_ = l10n_util::GetStringUTF16(
+          IDS_BLUETOOTH_DEVICE_CHOOSER_NO_DEVICES_FOUND_ADAPTER_OFF_PROMPT);
+      status_text_ = base::string16();
+      if (observer())
+        observer()->AdapterEnabled(false /* Bluetooth adapter is truned off */);

[msw, 2016/07/18 23:01:30]

nit: 'turned'

[juncai, 2016/07/19 20:42:46]

Done.

+      break;
+    case content::BluetoothChooser::AdapterPresence::POWERED_ON:
+      no_devices_text_ =
+          l10n_util::GetStringUTF16(IDS_DEVICE_CHOOSER_NO_DEVICES_FOUND_PROMPT);
+      status_text_ =
+          l10n_util::GetStringUTF16(IDS_BLUETOOTH_DEVICE_CHOOSER_RE_SCAN);
+      if (observer())
+        observer()->AdapterEnabled(true /* Bluetooth adapter is turned on */);
+      break;
+  }
+}
+
+void BluetoothChooserController::UpdateDiscoveryState(
+    content::BluetoothChooser::DiscoveryState state) {
+  switch (state) {
+    case content::BluetoothChooser::DiscoveryState::DISCOVERING:
+      status_text_ =
+          l10n_util::GetStringUTF16(IDS_BLUETOOTH_DEVICE_CHOOSER_SCANNING);
+      if (observer())
+        observer()->SetRefreshing(true /* Refreshing options is in progress */);
+      break;
+    case content::BluetoothChooser::DiscoveryState::IDLE:
+    case content::BluetoothChooser::DiscoveryState::FAILED_TO_START:
+      status_text_ =
+          l10n_util::GetStringUTF16(IDS_BLUETOOTH_DEVICE_CHOOSER_RE_SCAN);
+      if (observer())
+        observer()->SetRefreshing(false /* Refreshing options is complete*/);
+      break;
+  }
+}
+
 void BluetoothChooserController::AddDevice(const std::string& device_id,
                                            const base::string16& device_name) {
   device_names_and_ids_.push_back(std::make_pair(device_name, device_id));
@@ -103,3 +161,8 @@ void BluetoothChooserController::RemoveDevice(const std::string& device_id) {
     }
   }
 }
+
+void BluetoothChooserController::ClearAllDevices() {
+  device_names_and_ids_.clear();
+  device_name_map_.clear();
+}