Reland of move drawSprite from canvas (patchset #1 id:1 of https://codereview.chromium.org/1529803004/ )

Reason for revert:
guard has landed in chrome

Original issue's description:
> Revert of remove drawSprite from canvas (patchset #4 id:60001 of https://codereview.chromium.org/1534443003/ )
>
> Reason for revert:
> need to remove an override in chrome
>
> Original issue's description:
> > remove drawSprite from canvas
> >
> > BUG=skia:
> >
> > Committed: https://skia.googlesource.com/skia/+/4657ce2324ea197507c4ba728d81138f56da13b1
>
> TBR=fmalita@chromium.org,robertphillips@google.com,senorblanco@chromium.org,mtklein@google.com
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/32704674f64cb6a14356dfebe060cd3484c06cc7

TBR=fmalita@chromium.org,robertphillips@google.com,senorblanco@chromium.org,mtklein@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1530203002
diff --git a/gm/dropshadowimagefilter.cpp b/gm/dropshadowimagefilter.cpp
index 81824ab..512c82d 100644
--- a/gm/dropshadowimagefilter.cpp
+++ b/gm/dropshadowimagefilter.cpp
@@ -67,29 +67,6 @@
     canvas->restore();
 }
 
-static void draw_sprite(SkCanvas* canvas, const SkRect& r, SkImageFilter* imf) {
-    SkPaint paint;
-
-    SkIRect bounds;
-    r.roundOut(&bounds);
-
-    SkBitmap bm;
-    bm.allocN32Pixels(bounds.width(), bounds.height());
-    bm.eraseColor(SK_ColorRED);
-    SkCanvas c(bm);
-
-    SkIRect cropRect = SkIRect::MakeXYWH(10, 10, 44, 44);
-    paint.setColor(SK_ColorGREEN);
-    c.drawRect(SkRect::Make(cropRect), paint);
-
-    paint.setImageFilter(imf);
-    SkPoint loc = { r.fLeft, r.fTop };
-    canvas->getTotalMatrix().mapPoints(&loc, 1);
-    canvas->drawSprite(bm,
-                       SkScalarRoundToInt(loc.fX), SkScalarRoundToInt(loc.fY),
-                       &paint);
-}
-
 ///////////////////////////////////////////////////////////////////////////////
 
 class DropShadowImageFilterGM : public skiagm::GM {
@@ -113,7 +90,7 @@
 
     virtual void onDraw(SkCanvas* canvas) {
         void (*drawProc[])(SkCanvas*, const SkRect&, SkImageFilter*) = {
-            draw_sprite, draw_bitmap, draw_path, draw_paint, draw_text
+            draw_bitmap, draw_path, draw_paint, draw_text
         };
 
         SkAutoTUnref<SkColorFilter> cf(