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..ae2d2057e57509b3fdab71be4ae6d8b376e2f98b 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 +308,14 @@ void Sandbox::SandboxWarmup(int sandbox_type) {
     base::GetUrandomFD();
   }
 
+  { // IOSurfaceLookup() - 10.7

[jeremy, 2013/11/27 08:26:09]

Is there a bug you can link to?

Any idea how expensive this call is - asking from the point of view of startup
perf...

[reveman, 2013/11/27 16:04:28]

Done.
Added some tracing and IOSurfaceSupport::Initialize() consistently takes 0.2ms
and IOSurfaceLookup() 0.4ms on my Mac Pro.

+    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