Add SkImage factory method that forces image to be resolved to a texture.

src/image/SkImage.cpp

Index: src/image/SkImage.cpp
diff --git a/src/image/SkImage.cpp b/src/image/SkImage.cpp
index 25370bcff15e09ad2e7276ec3a98f23e4a79cf35..a3e1c26bdabdb97ab41f2322fa3aa38e9722bf68 100644
--- a/src/image/SkImage.cpp
+++ b/src/image/SkImage.cpp
@@ -339,4 +339,8 @@ SkImage* SkImage::NewFromTextureCopy(GrContext*, const GrBackendTextureDesc&, Sk
     return nullptr;
 }
 
+SkImage* SkImage::NewTextureImageFromImage(GrContext*, SkImage*) {
+    return nullptr;
+}
+
 #endif