Filter out Mac StatusIndicator window from desktop capture list

Since 12.2, the orange/red indicator at the top right of the screen shows up as a window in the Chrome getDisplayMedia() picker, as it's not filtered out by the existing filters. Screenshots in the bug.

Bug: chromium:1297731, b/218211225
Change-Id: I0f87e8d2af42a5a2e3d84f69fe73596e9cf35622
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/251841
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Tony Herre <herre@google.com>
Cr-Commit-Position: refs/heads/main@{#36350}

modules/desktop_capture/mac/window_list_utils.cc

@@ -31,6 +31,11 @@ namespace webrtc {
 
 namespace {
 
+// WindowName of the status indicator dot shown since Monterey in the taskbar.
+// Testing on 12.2.1 shows this is independent of system language setting.
+const CFStringRef kStatusIndicator = CFSTR("StatusIndicator");
+const CFStringRef kStatusIndicatorOwnerName = CFSTR("Window Server");
+
 bool ToUtf8(const CFStringRef str16, std::string* str8) {
   size_t maxlen = CFStringGetMaximumSizeForEncoding(CFStringGetLength(str16),
                                                     kCFStringEncodingUTF8) +
@@ -145,6 +150,17 @@ bool GetWindowList(rtc::FunctionView<bool(CFDictionaryRef)> on_window,
       continue;
     }
 
+    CFStringRef window_owner_name = reinterpret_cast<CFStringRef>(
+        CFDictionaryGetValue(window, kCGWindowOwnerName));
+    // Ignore the red dot status indicator shown in the stats bar. Unlike the
+    // rest of the system UI it has a window_layer of 0, so was otherwise
+    // included. See crbug.com/1297731.
+    if (window_title && CFEqual(window_title, kStatusIndicator) &&
+        window_owner_name &&
+        CFEqual(window_owner_name, kStatusIndicatorOwnerName)) {
+      continue;
+    }
+
     if (!on_window(window)) {
       break;
     }