remove Sk64 from public API, and start to remove usage internally

include/utils/SkRandom.h

Index: include/utils/SkRandom.h
diff --git a/include/utils/SkRandom.h b/include/utils/SkRandom.h
index eeaa701c6ec64bf209e11bd3c5aecbd09c3ea570..9191ec35c14e39b4a7882024a4bf22e4c06975b4 100644
--- a/include/utils/SkRandom.h
+++ b/include/utils/SkRandom.h
@@ -10,9 +10,12 @@
 #ifndef SkRandom_DEFINED
 #define SkRandom_DEFINED
 
-#include "Sk64.h"
 #include "SkScalar.h"
 
+#ifdef SK_SUPPORT_LEGACY_SK64
+    #include "Sk64.h"
+#endif
+
 /** \class SkLCGRandom
 
     Utility class that implements pseudo random 32bit numbers using a fast
@@ -123,13 +126,21 @@ public:
         return this->nextUScalar1() <= fractionTrue;
     }
 
-    /** Return the next pseudo random number as a signed 64bit value.
-    */
+    /**
+     *  Return the next pseudo random number as a signed 64bit value.
+     */
+    int64_t next64() {
+        int64_t hi = this->nextS();
+        return (hi << 32) | this->nextU();
+    }
+
+#ifdef SK_SUPPORT_LEGACY_SK64
+    SK_ATTR_DEPRECATED("use next64()")
     void next64(Sk64* a) {
         SkASSERT(a);
         a->set(this->nextS(), this->nextU());
     }
-
+#endif
     /**
      *  Return the current seed. This allows the caller to later reset to the
      *  same seed (using setSeed) so it can generate the same sequence.
@@ -276,12 +287,21 @@ public:
         return this->nextUScalar1() <= fractionTrue;
     }
 
-    /** Return the next pseudo random number as a signed 64bit value.
+    /**
+     *  Return the next pseudo random number as a signed 64bit value.
      */
+    int64_t next64() {
+        int64_t hi = this->nextS();
+        return (hi << 32) | this->nextU();
+    }
+    
+#ifdef SK_SUPPORT_LEGACY_SK64
+    SK_ATTR_DEPRECATED("use next64()")
     void next64(Sk64* a) {
         SkASSERT(a);
         a->set(this->nextS(), this->nextU());
     }
+#endif
 
     /** Reset the random object.
      */