Revert of PDF: remove last use of SkPDFImage (patchset #5 id:120001 of https://codereview.chromium.org/950633003/)

Reason for revert:
static void draw(SkCanvas* canvas,
                 const SkPaint& p,
                 const SkBitmap& src,
                 SkColorType colorType,
                 const char text[]) {
    SkASSERT(src.colorType() == colorType);
    canvas->drawBitmap(src, 0.0f, 0.0f);
    canvas->drawText(text, strlen(text), 0.0f, 12.0f, p);
}

This assert is firing, at least on macs, where all images get decoded into 32bit at the moment.

Original issue's description:
> PDF: remove last use of SkPDFImage
>
> Add a GM.
>
> BUG=skia:255
>
> Committed: https://skia.googlesource.com/skia/+/86ad8d643624a55b02e529100bbe4e2940115fa1

TBR=mtklein@google.com,halcanary@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:255

Review URL: https://codereview.chromium.org/1024113002
8 files changed