Implement skia sandbox callback

content/renderer/renderer_main_platform_delegate_win.cc

Index: content/renderer/renderer_main_platform_delegate_win.cc
diff --git a/content/renderer/renderer_main_platform_delegate_win.cc b/content/renderer/renderer_main_platform_delegate_win.cc
index 67a563dd4578e5750a6b1c0da42066a3a3822dde..b7de8fa4991652e21b51f9d9116555c5526766d0 100644
--- a/content/renderer/renderer_main_platform_delegate_win.cc
+++ b/content/renderer/renderer_main_platform_delegate_win.cc
@@ -9,7 +9,9 @@
 #include "base/memory/scoped_ptr.h"
 #include "content/common/injection_test_dll.h"
 #include "content/public/common/content_switches.h"
+#include "content/public/renderer/render_thread.h"
 #include "sandbox/src/sandbox.h"
+#include "skia/ext/skia_sandbox_support_win.h"
 #include "unicode/timezone.h"
 
 namespace {
@@ -59,6 +61,14 @@ void EnableThemeSupportForRenderer(bool no_sandbox) {
   }
 }
 
+// Windows-only skia sandbox support
+void SkiaPreCacheFont(LOGFONT logfont) {
+  content::RenderThread* render_thread = content::RenderThread::Get();
+  if (render_thread) {
+    render_thread->PreCacheFont(logfont);
+  }
+}
+
 }  // namespace
 
 RendererMainPlatformDelegate::RendererMainPlatformDelegate(
@@ -85,6 +95,7 @@ void RendererMainPlatformDelegate::PlatformInitialize() {
     // cached and there's no more need to access the registry. If the sandbox
     // is disabled, we don't have to make this dummy call.
     scoped_ptr<icu::TimeZone> zone(icu::TimeZone::createDefault());
+    SetSkiaEnsureTypefaceAccessible(SkiaPreCacheFont);
   }
 }