SkShaderBase

Introduce a private base class (SkShaderBase), to hide
implementation details from the public interface (SkShader).

Change-Id: If3ec26ca6abc9da20e3f139c11fdc023bdd85176
Reviewed-on: https://skia-review.googlesource.com/17241
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Mike Reed <reed@google.com>
61 files changed