fix: navigator.bluetooth.requestDevice (#27902)

* fix: navigator.bluetooth.requestDevice

* cleanup lint and add test

* update bluetooth test to handle no bluetooth adapter available

* update bluetooth test to handle bluetooth permission denied

shell/browser/lib/bluetooth_chooser.cc

@@ -44,7 +44,9 @@ BluetoothChooser::BluetoothChooser(api::WebContents* contents,
                                    const EventHandler& event_handler)
     : api_web_contents_(contents), event_handler_(event_handler) {}
 
-BluetoothChooser::~BluetoothChooser() = default;
+BluetoothChooser::~BluetoothChooser() {
+  event_handler_.Reset();
+}
 
 void BluetoothChooser::SetAdapterPresence(AdapterPresence presence) {
   switch (presence) {
@@ -65,9 +67,11 @@ void BluetoothChooser::SetAdapterPresence(AdapterPresence presence) {
 void BluetoothChooser::ShowDiscoveryState(DiscoveryState state) {
   switch (state) {
     case DiscoveryState::FAILED_TO_START:
+      refreshing_ = false;
       event_handler_.Run(content::BluetoothChooserEvent::CANCELLED, "");
       break;
     case DiscoveryState::IDLE:
+      refreshing_ = false;
       if (device_map_.empty()) {
         auto event = ++num_retries_ > kMaxScanRetries
                          ? content::BluetoothChooserEvent::CANCELLED
@@ -86,6 +90,14 @@ void BluetoothChooser::ShowDiscoveryState(DiscoveryState state) {
       }
       break;
     case DiscoveryState::DISCOVERING:
+      // The first time this state fires is due to a rescan triggering so set a
+      // flag to ignore devices
+      if (!refreshing_) {
+        refreshing_ = true;
+      } else {
+        // The second time this state fires we are now safe to pick a device
+        refreshing_ = false;
+      }
       break;
   }
 }
@@ -96,6 +108,11 @@ void BluetoothChooser::AddOrUpdateDevice(const std::string& device_id,
                                          bool is_gatt_connected,
                                          bool is_paired,
                                          int signal_strength_level) {
+  if (refreshing_) {
+    // If the list of bluetooth devices is currently being generated don't fire
+    // an event
+    return;
+  }
   bool changed = false;
   auto entry = device_map_.find(device_id);
   if (entry == device_map_.end()) {

shell/browser/lib/bluetooth_chooser.h

@@ -41,6 +41,7 @@ class BluetoothChooser : public content::BluetoothChooser {
   api::WebContents* api_web_contents_;
   EventHandler event_handler_;
   int num_retries_ = 0;
+  bool refreshing_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothChooser);
 };