SkPDF: Change some identifiers.

    s/SkPDFShader::GetPDFShader/SkPDFMakeShader/g
    s/SkPDFShader::State/SkPDFImageShaderKey/g
    s/state/key/g

Change-Id: I86dc932c3407c73f387c972fb6674dc09ea0be3c
Reviewed-on: https://skia-review.googlesource.com/21661
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
5 files changed