Wayland: add switch to disable implicit sync interop

Mali kbase and mutter 43 ignore implicit dma-buf fences, so committing
before the GPU finishes shows half-drawn frames. With the switch, the GPU
process waits for its own fences before commit.

--- a/ui/ozone/platform/wayland/host/wayland_buffer_manager_host.cc
+++ b/ui/ozone/platform/wayland/host/wayland_buffer_manager_host.cc
@@ -11,6 +11,7 @@
 #include <memory>
 #include <utility>
 
+#include "base/command_line.h"
 #include "base/functional/bind.h"
 #include "base/i18n/number_formatting.h"
 #include "base/logging.h"
@@ -73,6 +74,13 @@
 }
 
 bool CheckImportExportFence() {
+  // Mali kbase ignores implicit dma-buf fences: let the GPU process wait for
+  // its own fences before commit instead.
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          "disable-wayland-implicit-sync-interop")) {
+    return false;
+  }
+
   KernelVersion ver = KernelVersionNumbers();
 
   // DMA_BUF_IOCTL_{IMPORT,EXPORT}_SYNC_FILE was added in 6.0