Add PDF compositor service

content/public/utility/utility_thread.h

Index: content/public/utility/utility_thread.h
diff --git a/content/public/utility/utility_thread.h b/content/public/utility/utility_thread.h
index c76efda6e1bda219392d8dfeb4bc6a3fe12c4b8b..2ee4844eae7e1ff955f82be714675232f59fe8ba 100644
--- a/content/public/utility/utility_thread.h
+++ b/content/public/utility/utility_thread.h
@@ -23,6 +23,9 @@ class CONTENT_EXPORT UtilityThread : virtual public ChildThread {
 
   // Initializes blink if it hasn't already been initialized.
   virtual void EnsureBlinkInitialized() = 0;
+
+  // Set up resources for Skia to use.
+  virtual void EnsureReadyForSkia() = 0;
 };
 
 }  // namespace content