fix: check PipeWire init before creating generic capturer (#39873)

* fix: check PipeWire init before creating generic capturer

Check if PipeWire can be initialized before creating generic capturer.
This harmonizes the conditions with the ones used in Linux
implementations of DesktopCapturer::CreateRawScreenCapturer and
DesktopCapturer::CreateRawWindowCapturer.

Co-authored-by: Athul Iddya <athul@iddya.com>

* chore: update patches

---------

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Athul Iddya <athul@iddya.com>
Co-authored-by: PatchUp <73610968+patchup[bot]@users.noreply.github.com>

patches/webrtc/.patches

@@ -3,3 +3,4 @@ cherry-pick-0e9556a90cec.patch
 fix_mark_pipewire_capturer_as_failed_after_session_is_closed.patch
 pipewire_capturer_increase_buffer_size_to_avoid_buffer_overflow.patch
 prevent_sdp_munging_of_duplicate_ssrcs.patch
+fix_check_pipewire_init_before_creating_generic_capturer.patch

patches/webrtc/fix_check_pipewire_init_before_creating_generic_capturer.patch

@@ -0,0 +1,23 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Athul Iddya <athul@iddya.com>
+Date: Tue, 12 Sep 2023 22:19:46 -0700
+Subject: fix: check PipeWire init before creating generic capturer
+
+Check if PipeWire can be initialized before creating generic capturer.
+This harmonizes the conditions with the ones used in Linux
+implementations of DesktopCapturer::CreateRawScreenCapturer and
+DesktopCapturer::CreateRawWindowCapturer.
+
+diff --git a/modules/desktop_capture/desktop_capturer.cc b/modules/desktop_capture/desktop_capturer.cc
+index b99f5ecb803ac0ac0e26fbdb3411c77605f33011..8c377459c6c1fa2597b6a63991cfdd58a99b1900 100644
+--- a/modules/desktop_capture/desktop_capturer.cc
++++ b/modules/desktop_capture/desktop_capturer.cc
+@@ -111,7 +111,7 @@ std::unique_ptr<DesktopCapturer> DesktopCapturer::CreateGenericCapturer(
+   std::unique_ptr<DesktopCapturer> capturer;
+
+ #if defined(WEBRTC_USE_PIPEWIRE)
+-  if (options.allow_pipewire() && DesktopCapturer::IsRunningUnderWayland()) {
++  if (options.allow_pipewire() && BaseCapturerPipeWire::IsSupported()) {
+     capturer = std::make_unique<BaseCapturerPipeWire>(
+         options, CaptureType::kAnyScreenContent);
+   }