SkLiteDL: remove freelisting, add reset() and SKLITEDL_PAGE knob.

src/core/SkLiteDL.h

Index: src/core/SkLiteDL.h
diff --git a/src/core/SkLiteDL.h b/src/core/SkLiteDL.h
index 27e3479e0378e7eeb71045cf1917a3b2f7cec7c3..7a15eb551b747848e5c4999dd8e01bd8c20f4bf2 100644
--- a/src/core/SkLiteDL.h
+++ b/src/core/SkLiteDL.h
@@ -20,8 +20,7 @@ class GrContext;
 class SkLiteDL final : public SkDrawable {
 public:
     static sk_sp<SkLiteDL> New(SkRect);
-
-    static void PurgeFreelist();
+    void reset(SkRect);
 
     void optimizeFor(GrContext*);
     void makeThreadsafe();
@@ -79,11 +78,9 @@ public:
                    SkXfermode::Mode, const SkRect*, const SkPaint*);
 
 private:
-    SkLiteDL();
+    SkLiteDL(SkRect);
     ~SkLiteDL();
 
-    void internal_dispose() const override;
-
     SkRect   onGetBounds() override;
     void onDraw(SkCanvas*) override;
 
@@ -97,10 +94,6 @@ private:
     size_t                 fUsed;
     size_t                 fReserved;
     SkRect                 fBounds;
-
-    // Only used for freelisting.
-    SkLiteDL* fNext;
-    int       fUsesRemaining;
 };
 
 #endif//SkLiteDL_DEFINED