Fix use of uninitialized value in SkColor4Shader::CreateProc

cherry-picking fix 2e425ebd95dd97f788f7f8a3b8529d77d69b4f61

No-Tree-Checks: true
No-Try: true
No-Presubmit: true
Bug: chromium:727678
Change-Id: I4c59d9222d47b866b3c30408322ec456f304aa53
Reviewed-On: https://skia-review.googlesource.com/18938
Commit-Queue: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-By: Mike Klein <mtklein@chromium.org>
Reviewed-on: https://skia-review.googlesource.com/20147
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed