Don't copy image buffer when calculating size.

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 06ec224a2a9cbc23fa02b83288128a4252329b26..a70acc04759982b2e937fee7225fd9e4270fc0e3 100644
--- a/src/image/SkImage_Gpu.cpp
+++ b/src/image/SkImage_Gpu.cpp
@@ -485,11 +485,7 @@ size_t SkImage::getDeferredTextureImageData(const GrContextThreadSafeProxy& prox
             ctSize = SkAlign8(pixmap.ctable()->count() * 4);
         }
     } else {
-        // Here we're just using presence of data to know whether there is a codec behind the image.
-        // In the future we will access the cacherator and get the exact data that we want to (e.g.
-        // yuv planes) upload.
-        sk_sp<SkData> data(this->refEncoded());
-        if (!data && !this->peekPixels(nullptr)) {
+        if (!as_IB(this)->peekCacherator() && !this->peekPixels(nullptr)) {
             return 0;
         }
         info = SkImageInfo::MakeN32(scaledSize.width(), scaledSize.height(), this->alphaType());