Remove image usage type enum. Use GrTextureParams instead.

src/image/SkImage_Gpu.cpp

Index: src/image/SkImage_Gpu.cpp
diff --git a/src/image/SkImage_Gpu.cpp b/src/image/SkImage_Gpu.cpp
index 72b98cd5890bcfd6b2cce610115bddd8c3d0472b..ccb27eed833ced3485b5fa31f7ffacfd38b31817 100644
--- a/src/image/SkImage_Gpu.cpp
+++ b/src/image/SkImage_Gpu.cpp
@@ -109,8 +109,8 @@ private:
     typedef GrTextureMaker INHERITED;
 };
 
-GrTexture* SkImage_Gpu::asTextureRef(GrContext* ctx, SkImageUsageType usage) const {
-    return Texture_GrTextureMaker(this, fTexture).refCachedTexture(ctx, usage);
+GrTexture* SkImage_Gpu::asTextureRef(GrContext* ctx, const GrTextureParams& params) const {
+    return Texture_GrTextureMaker(this, fTexture).refCachedTexture(ctx, params);
 }
 
 bool SkImage_Gpu::isOpaque() const {