rename SkCanvasDrawable to SkDrawable, and make public

include/core/SkCanvas.h

Index: include/core/SkCanvas.h
diff --git a/include/core/SkCanvas.h b/include/core/SkCanvas.h
index 53ca92ee959d9adfd233ad58f53d7c4978bfe544..0ec167e1166e72870b90440ae31d4ca348a7cec4 100644
--- a/include/core/SkCanvas.h
+++ b/include/core/SkCanvas.h
@@ -21,8 +21,8 @@
 
 class SkBaseDevice;
 class SkCanvasClipVisitor;
-class SkCanvasDrawable;
 class SkDraw;
+class SkDrawable;
 class SkDrawFilter;
 class SkImage;
 class SkMetaData;
@@ -1018,7 +1018,15 @@ public:
     void drawPatch(const SkPoint cubics[12], const SkColor colors[4],
                    const SkPoint texCoords[4], SkXfermode* xmode, const SkPaint& paint);
 
-    void EXPERIMENTAL_drawDrawable(SkCanvasDrawable*);
+    /**
+     *  Draw the contents of this drawable into the canvas. If the canvas is async
+     *  (e.g. it is recording into a picture) then the drawable will be referenced instead,
+     *  to have its draw() method called when the picture is finalized.
+     *
+     *  If the intent is to force the contents of the drawable into this canvas immediately,
+     *  then drawable->draw(canvas) may be called.
+     */
+    void drawDrawable(SkDrawable* drawable);
 
     /** Add comments. beginCommentGroup/endCommentGroup open/close a new group.
         Each comment added via addComment is notionally attached to its
@@ -1188,7 +1196,7 @@ protected:
     virtual void onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
                            const SkPoint texCoords[4], SkXfermode* xmode, const SkPaint& paint);
 
-    virtual void onDrawDrawable(SkCanvasDrawable*);
+    virtual void onDrawDrawable(SkDrawable*);
 
     virtual void onDrawPaint(const SkPaint&);
     virtual void onDrawRect(const SkRect&, const SkPaint&);