SkImageFilter::onMakeColorSpace() - more overrides

Fills out most of the simple implementations.
Improves 22 gms in gbr-8888.

Bug: skia:
Change-Id: I881ade140993568263de75be51aed240d2de8cc6
Reviewed-on: https://skia-review.googlesource.com/13126
Commit-Queue: Matt Sarett <msarett@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
diff --git a/src/core/SkColorSpaceXformer.h b/src/core/SkColorSpaceXformer.h
index 020051b..6d5aaac 100644
--- a/src/core/SkColorSpaceXformer.h
+++ b/src/core/SkColorSpaceXformer.h
@@ -18,12 +18,13 @@
 
     sk_sp<SkImage> apply(const SkImage* src);
     sk_sp<SkImage> apply(const SkBitmap& bitmap);
+    sk_sp<SkColorFilter> apply(const SkColorFilter* shader);
     const SkPaint* apply(const SkPaint* src);
     const SkPaint& apply(const SkPaint& src);
     void apply(SkColor dst[], const SkColor src[], int n);
+    SkColor apply(SkColor srgb);
 
 private:
-    SkColor apply(SkColor srgb);
     sk_sp<SkShader> apply(const SkShader* shader);
 
     SkColorSpaceXformer() {}