Revert of Remove font cache code

content/child/font_warmup_win.h

Index: content/child/font_warmup_win.h
diff --git a/content/child/font_warmup_win.h b/content/child/font_warmup_win.h
index 9bbdaae41198f7260c520f4c67eb106da2f69254..bd1ae6963ce93ef52b13db7d5ddb917841ee8ca7 100644
--- a/content/child/font_warmup_win.h
+++ b/content/child/font_warmup_win.h
@@ -15,6 +15,14 @@
 class SkTypeface;
 
 namespace content {
+
+// Make necessary calls to cache the data for a given font, used before
+// sandbox lockdown.
+CONTENT_EXPORT void DoPreSandboxWarmupForTypeface(SkTypeface* typeface);
+
+// Get the shared font manager used during pre-sandbox warmup for DirectWrite
+// fonts.
+CONTENT_EXPORT SkFontMgr* GetPreSandboxWarmupFontMgr();
 
 class GdiFontPatchData {
  public:
@@ -42,6 +50,9 @@
 // for testing the implementation.
 CONTENT_EXPORT void SetPreSandboxWarmupFontMgrForTesting(SkFontMgr* fontmgr);
 
+// Warmup the direct write font manager for content processes.
+CONTENT_EXPORT void WarmupDirectWrite();
+
 // Directwrite connects to the font cache service to retrieve information about
 // fonts installed on the system etc. This works well outside the sandbox and
 // within the sandbox as long as the lpc connection maintained by the current