respect srgb gamma when building mips

src/gpu/SkGr.cpp

Index: src/gpu/SkGr.cpp
diff --git a/src/gpu/SkGr.cpp b/src/gpu/SkGr.cpp
index ca7d6b8e84f253b8e81f9cfefbd484f5acab5079..cf50f6004edd6323909a761f5d5684ed6cdc1f2a 100644
--- a/src/gpu/SkGr.cpp
+++ b/src/gpu/SkGr.cpp
@@ -345,12 +345,6 @@ GrTexture* GrGenerateMipMapsAndUploadToTexture(GrContext* ctx, const SkBitmap& b
         return texture.release();
     }
 
-    // SkMipMap::Build doesn't handle sRGB data correctly (yet).
-    // Failover to the GL code-path for now.
-    if (kLinear_SkColorProfileType != bitmap.profileType()) {
-        return nullptr;
-    }
-
     SkASSERT(sizeof(int) <= sizeof(uint32_t));
     if (bitmap.width() < 0 || bitmap.height() < 0) {
         return nullptr;
@@ -366,7 +360,7 @@ GrTexture* GrGenerateMipMapsAndUploadToTexture(GrContext* ctx, const SkBitmap& b
         sk_throw();
     }
 
-    SkAutoTDelete<SkMipMap> mipmaps(SkMipMap::Build(pixmap, nullptr));
+    SkAutoTDelete<SkMipMap> mipmaps(SkMipMap::Build(pixmap, gammaTreatment, nullptr));
     if (!mipmaps) {
         return nullptr;
     }