gpu: Add IOSurface backed GpuMemoryBuffer implementation.

content/common/sandbox_mac.mm

Index: content/common/sandbox_mac.mm
diff --git a/content/common/sandbox_mac.mm b/content/common/sandbox_mac.mm
index a9f42e2ec925dc5010fb5b8124cd71a32d7ae0de..0baa2756bddf49775ca6b7829c786e0246f3d048 100644
--- a/content/common/sandbox_mac.mm
+++ b/content/common/sandbox_mac.mm
@@ -36,6 +36,7 @@ extern "C" {
 #include "third_party/icu/source/common/unicode/uchar.h"
 #include "ui/base/layout.h"
 #include "ui/gl/gl_surface.h"
+#include "ui/gl/io_surface_support_mac.h"
 
 namespace content {
 namespace {
@@ -307,6 +308,15 @@ void Sandbox::SandboxWarmup(int sandbox_type) {
     base::GetUrandomFD();
   }
 
+  { // IOSurfaceLookup() - 10.7
+    // Needed by zero-copy texture update framework - crbug.com/323338
+    IOSurfaceSupport* io_surface_support = IOSurfaceSupport::Initialize();
+    if (io_surface_support) {
+      base::ScopedCFTypeRef<CFTypeRef> io_surface(
+          io_surface_support->IOSurfaceLookup(0));
+    }
+  }
+
   // Process-type dependent warm-up.
   if (sandbox_type == SANDBOX_TYPE_UTILITY) {
     // CFTimeZoneCopyZone() tries to read /etc and /private/etc/localtime - 10.8