Add deferred texture upload API.

src/image/SkImage.cpp

Index: src/image/SkImage.cpp
diff --git a/src/image/SkImage.cpp b/src/image/SkImage.cpp
index a41ac83d1906aa6f59f7c2a28b95b51ec2543069..4b543a27696af894c5335018470aa67bd6a4d0bc 100644
--- a/src/image/SkImage.cpp
+++ b/src/image/SkImage.cpp
@@ -349,6 +349,16 @@ bool SkImage::isLazyGenerated() const {
 #if !SK_SUPPORT_GPU
 
 SkImage* SkImage::NewTextureFromPixmap(GrContext*, const SkPixmap&, SkBudgeted budgeted) {
+    return nullptr
+}
+
+size_t SkImage::getDeferredTextureImageData(const GrContextThreadSafeProxy&,
+                                            const DeferredTextureImageUsageParams[],
+                                            int paramCnt, void* buffer) const {
+    return 0;
+}
+
+SkImage* SkImage::NewFromDeferredTextureImageData(GrContext* context, const void*, SkBudgeted) {
     return nullptr;
 }