Revert of rename SkCanvasDrawable to SkDrawable, and make public

src/core/SkRecordDraw.cpp

Index: src/core/SkRecordDraw.cpp
diff --git a/src/core/SkRecordDraw.cpp b/src/core/SkRecordDraw.cpp
index 3fed8de95caf6615a9c7f9ad014ce2bb3c635c37..a59d325eefc50fd4db4d31bab19cf56700815a0b 100644
--- a/src/core/SkRecordDraw.cpp
+++ b/src/core/SkRecordDraw.cpp
@@ -12,7 +12,7 @@
 void SkRecordDraw(const SkRecord& record,
                   SkCanvas* canvas,
                   SkPicture const* const drawablePicts[],
-                  SkDrawable* const drawables[],
+                  SkCanvasDrawable* const drawables[],
                   int drawableCount,
                   const SkBBoxHierarchy* bbh,
                   SkPicture::AbortCallback* callback) {
@@ -124,7 +124,7 @@
     SkASSERT(r.index < fDrawableCount);
     if (fDrawables) {
         SkASSERT(NULL == fDrawablePicts);
-        fCanvas->drawDrawable(fDrawables[r.index]);
+        fCanvas->EXPERIMENTAL_drawDrawable(fDrawables[r.index]);
     } else {
         fCanvas->drawPicture(fDrawablePicts[r.index]);
     }