Outline SkImageFilter Make methods

src/core/SkLocalMatrixImageFilter.cpp

Index: src/core/SkLocalMatrixImageFilter.cpp
diff --git a/src/core/SkLocalMatrixImageFilter.cpp b/src/core/SkLocalMatrixImageFilter.cpp
index 42acee0c221b5614fa02a6cb16068ee2fea22e0e..b4d5bb2741ead830612b99463719ac1d7cd27599 100644
--- a/src/core/SkLocalMatrixImageFilter.cpp
+++ b/src/core/SkLocalMatrixImageFilter.cpp
@@ -10,6 +10,20 @@
 #include "SkSpecialImage.h"
 #include "SkString.h"
 
+sk_sp<SkImageFilter> SkLocalMatrixImageFilter::Make(const SkMatrix& localM,
+                                                    sk_sp<SkImageFilter> input) {
+    if (!input) {
+        return nullptr;
+    }
+    if (localM.getType() & (SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask)) {
+        return nullptr;
+    }
+    if (localM.isIdentity()) {
+        return input;
+    }
+    return sk_sp<SkImageFilter>(new SkLocalMatrixImageFilter(localM, input));
+}
+
 SkLocalMatrixImageFilter::SkLocalMatrixImageFilter(const SkMatrix& localM,
                                                    sk_sp<SkImageFilter> input)
     : INHERITED(&input, 1, nullptr)