Add SkSourceGammaTreatment enum so we know how to create mips

src/gpu/GrImageIDTextureAdjuster.h

Index: src/gpu/GrImageIDTextureAdjuster.h
diff --git a/src/gpu/GrImageIDTextureAdjuster.h b/src/gpu/GrImageIDTextureAdjuster.h
index ad5e671b73d5e181effdd34d653f5a32d1381560..d516fc592c212a7f21786f080181c25ea7110825 100644
--- a/src/gpu/GrImageIDTextureAdjuster.h
+++ b/src/gpu/GrImageIDTextureAdjuster.h
@@ -55,7 +55,7 @@ public:
     GrBitmapTextureMaker(GrContext* context, const SkBitmap& bitmap);
 
 protected:
-    GrTexture* refOriginalTexture(bool willBeMipped) override;
+    GrTexture* refOriginalTexture(bool willBeMipped, SkSourceGammaTreatment) override;
 
     void makeCopyKey(const CopyParams& copyParams, GrUniqueKey* copyKey) override;
 
@@ -80,7 +80,7 @@ protected:
     //       able to efficiently produce a "stretched" texture natively (e.g. picture-backed)
     //          GrTexture* generateTextureForParams(const CopyParams&) override;
 
-    GrTexture* refOriginalTexture(bool willBeMipped) override;
+    GrTexture* refOriginalTexture(bool willBeMipped, SkSourceGammaTreatment) override;
     void makeCopyKey(const CopyParams& stretch, GrUniqueKey* paramsCopyKey) override;
     void didCacheCopy(const GrUniqueKey& copyKey) override;