ozone: ClientPixmapManager passes VGEM fd from browser to renderer.

content/child/child_io_surface_manager_mac.h

Index: content/child/child_io_surface_manager_mac.h
diff --git a/content/child/child_io_surface_manager_mac.h b/content/child/child_io_surface_manager_mac.h
index 40098e4e3a564f688411a94e056d7619630fa375..e780824dfec691bd8a1c7fd42f1d6aff8ef65be0 100644
--- a/content/child/child_io_surface_manager_mac.h
+++ b/content/child/child_io_surface_manager_mac.h
@@ -9,7 +9,7 @@
 #include "base/macros.h"
 #include "base/memory/singleton.h"
 #include "base/synchronization/waitable_event.h"
-#include "base/threading/platform_thread.h"
+#include "base/threading/thread_checker.h"
 #include "content/common/mac/io_surface_manager.h"
 #include "content/common/mac/io_surface_manager_token.h"
 
@@ -38,9 +38,7 @@ class CONTENT_EXPORT ChildIOSurfaceManager : public IOSurfaceManager {
   // Set the token used when communicating with the Mach service.
   void set_token(const IOSurfaceManagerToken& token) {
     token_ = token;
-#if !defined(NDEBUG)
-    set_token_thread_id_ = base::PlatformThread::CurrentRef();
-#endif
+    set_token_thread_checker_.reset(new base::ThreadChecker());
     set_token_event_.Signal();
   }
 
@@ -52,9 +50,7 @@ class CONTENT_EXPORT ChildIOSurfaceManager : public IOSurfaceManager {
 
   base::mac::ScopedMachSendRight service_port_;
   IOSurfaceManagerToken token_;
-#if !defined(NDEBUG)
-  base::PlatformThreadRef set_token_thread_id_;
-#endif
+  scoped_ptr<base::ThreadChecker> set_token_thread_checker_;
   base::WaitableEvent set_token_event_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildIOSurfaceManager);