ozone: ClientPixmapManager passes VGEM fd from browser to renderer.

content/child/child_io_surface_manager_mac.cc

Index: content/child/child_io_surface_manager_mac.cc
diff --git a/content/child/child_io_surface_manager_mac.cc b/content/child/child_io_surface_manager_mac.cc
index 65df72b04aa034053d80a292362a0c234f574884..44eef959a4575d4f1ecf2ee4a76b1bf8ffabc7fb 100644
--- a/content/child/child_io_surface_manager_mac.cc
+++ b/content/child/child_io_surface_manager_mac.cc
@@ -5,6 +5,7 @@
 #include "content/child/child_io_surface_manager_mac.h"
 
 #include "base/mac/mach_logging.h"
+#include "base/threading/thread_restrictions.h"
 #include "content/common/mac/io_surface_manager_messages.h"
 
 namespace content {
@@ -96,8 +97,11 @@ IOSurfaceRef ChildIOSurfaceManager::AcquireIOSurface(
 
   // A valid token is required to acquire an IOSurface. This will wait for a
   // valid token if one has not yet been set.
-  set_token_event_.Wait();
-#if !defined(NDEBUG)
+  {
+    base::ThreadRestrictions::ScopedAllowWait allow_wait;
+    set_token_event_.Wait();
+  }
+#if DCHECK_IS_ON()
   DCHECK(!(set_token_thread_id_ == base::PlatformThread::CurrentRef()));
 #endif
   DCHECK(!token_.IsZero());