content: Pass IOSurface references using Mach IPC.

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index 21694dc9ce2982cef8715f89972ecc693e070803..cf3f150089730112aeaf4aebdd8a862782f0bf9b 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -24,6 +24,10 @@
 #include "ui/gfx/gpu_memory_buffer.h"
 #include "ui/gl/gpu_switching_observer.h"
 
+#if defined(OS_MACOSX) && !defined(OS_IOS)
+#include "content/common/mac/io_surface_manager_token.h"
+#endif
+
 namespace base {
 class CommandLine;
 class MessageLoop;
@@ -501,6 +505,12 @@ class CONTENT_EXPORT RenderProcessHostImpl
   // Whether or not the CHROMIUM_subscribe_uniform WebGL extension is enabled
   bool subscribe_uniform_enabled_;
 
+#if defined(OS_MACOSX) && !defined(OS_IOS)
+  // Unique unguessable token that the child process is using to acquire
+  // IOSurface references.
+  IOSurfaceManagerToken io_surface_manager_token_;
+#endif
+
   base::WeakPtrFactory<RenderProcessHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderProcessHostImpl);