Fix regression caused by drawing accelerated content on SW canvas

The recent change introducing PaintImage::GetSwSkImage() caused a
regression that occurs when drawing accelerated resources on a software
canvas.

This is a quick fix to revert the culprit caller back to
PaintImage::GetSkImage(). This avoids the cost of multiple readbacks
that GetSwSkImage() incurs. A follow up change will introduce caching in
GetSwSkImage(), at which point we can use it again.

Bug: 1115686
Change-Id: I765f85acf2d53c7f379b4d5cffd86a1224be4318
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2358432Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: Jonah Chin <jochin@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#798898}

cc/raster/playback_image_provider.cc

@@ -67,10 +67,9 @@ ImageProvider::ScopedResult PlaybackImageProvider::GetRasterContent(
           SkSize::Make(1.f, 1.f), draw_image.filter_quality(),
           true /* is_budgeted */));
     } else {
-      return ScopedResult(
-          DecodedDrawImage(paint_image.GetSwSkImage(), SkSize::Make(0, 0),
-                           SkSize::Make(1.f, 1.f), draw_image.filter_quality(),
-                           true /* is_budgeted */));
+      return ScopedResult(DecodedDrawImage(
+          paint_image.GetSkImage(), SkSize::Make(0, 0), SkSize::Make(1.f, 1.f),
+          draw_image.filter_quality(), true /* is_budgeted */));
     }
   }