start on apply gamma cleanup

src/image/SkSurface_Gpu.cpp

Index: src/image/SkSurface_Gpu.cpp
diff --git a/src/image/SkSurface_Gpu.cpp b/src/image/SkSurface_Gpu.cpp
index ef8dd5f06e7196e2f41e5268461cb3959f07bf20..5d3f257d461b617ca40cbd20fa5327411a6ede2e 100644
--- a/src/image/SkSurface_Gpu.cpp
+++ b/src/image/SkSurface_Gpu.cpp
@@ -129,6 +129,17 @@ void SkSurface_Gpu::onPrepareForExternalIO() {
     fDevice->flush();
 }
 
+bool SkSurface_Gpu::onBlitWithGamma(SkImage* image, SkScalar gamma) {
+    GrRenderTarget* dst = fDevice->accessDrawContext()->accessRenderTarget();
+    if (GrTexture* src = as_IB(image)->asTextureRef(dst->getContext(),
+                                                    GrTextureParams::ClampNoFilter(),
+                                                    SkSourceGammaTreatment::kRespect)) {
+        fDevice.get()->context()->applyGamma(dst, src, gamma);
+        return true;
+    }
+    return false;
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 sk_sp<SkSurface> SkSurface::MakeRenderTargetDirect(GrRenderTarget* target,