Outline SkImageFilter Make methods

include/effects/SkImageSource.h

Index: include/effects/SkImageSource.h
diff --git a/include/effects/SkImageSource.h b/include/effects/SkImageSource.h
index 0b4fecd776e365f6889ae2b4078a972afa24bf4d..4ceff95668ee635ec4148352947f93c5930ecd37 100644
--- a/include/effects/SkImageSource.h
+++ b/include/effects/SkImageSource.h
@@ -13,25 +13,11 @@
 
 class SK_API SkImageSource : public SkImageFilter {
 public:
-    static sk_sp<SkImageFilter> Make(sk_sp<SkImage> image) {
-        if (!image) {
-            return nullptr;
-        }
-
-        return sk_sp<SkImageFilter>(new SkImageSource(std::move(image)));
-    }
+    static sk_sp<SkImageFilter> Make(sk_sp<SkImage> image);
     static sk_sp<SkImageFilter> Make(sk_sp<SkImage> image,
                                      const SkRect& srcRect,
                                      const SkRect& dstRect,
-                                     SkFilterQuality filterQuality) {
-        if (!image) {
-            return nullptr;
-        }
-
-        return sk_sp<SkImageFilter>(new SkImageSource(std::move(image),
-                                                      srcRect, dstRect,
-                                                      filterQuality));
-    }
+                                     SkFilterQuality filterQuality);
 
     SkRect computeFastBounds(const SkRect& src) const override;