Revert of Remove font cache code

content/common/sandbox_win.cc

Index: content/common/sandbox_win.cc
diff --git a/content/common/sandbox_win.cc b/content/common/sandbox_win.cc
index 8be9b1115c9e61cc12f7b0a5d374c0d640c31253..86b0dcb4fb42cf41797feb882d2a0dbbb57db798 100644
--- a/content/common/sandbox_win.cc
+++ b/content/common/sandbox_win.cc
@@ -32,6 +32,7 @@
 #include "content/common/content_switches_internal.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_switches.h"
+#include "content/public/common/dwrite_font_platform_win.h"
 #include "content/public/common/sandbox_init.h"
 #include "content/public/common/sandboxed_process_launcher_delegate.h"
 #include "sandbox/win/src/process_mitigations.h"
@@ -756,6 +757,24 @@
                   true,
                   sandbox::TargetPolicy::FILES_ALLOW_READONLY,
                   policy);
+
+      if (!ShouldUseDirectWriteFontProxyFieldTrial()) {
+        // If DirectWrite is enabled for font rendering then open the font
+        // cache section which is created by the browser and pass the handle to
+        // the renderer process. This is needed because renderer processes on
+        // Windows 8+ may be running in an AppContainer sandbox and hence their
+        // kernel object namespace may be partitioned.
+        std::string name(content::kFontCacheSharedSectionName);
+        name.append(base::UintToString(base::GetCurrentProcId()));
+
+        if (direct_write_font_cache_section.Open(name, true)) {
+          HANDLE handle = direct_write_font_cache_section.handle().GetHandle();
+          policy->AddHandleToShare(handle);
+          cmd_line->AppendSwitchASCII(
+              switches::kFontCacheSharedHandle,
+              base::UintToString(base::win::HandleToUint32(handle)));
+        }
+      }
     }
   }
 #endif