start on pre-upload data

src/image/SkImage_Gpu.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrCaps.h"
 #include "GrContext.h"
 #include "GrDrawContext.h"
@@ skipping 292 matching lines @@
         return create_image_from_maker(&maker, at, this->uniqueID());
     }
     SkBitmap bmp;
     if (!this->asLegacyBitmap(&bmp, kRO_LegacyBitmapMode)) {
         return nullptr;
     }
     GrBitmapTextureMaker maker(context, bmp);
     return create_image_from_maker(&maker, at, this->uniqueID());
 }
 
+SkImage* SkImage::NewTextureFromPixmap(GrContext* ctx, const SkPixmap& pixmap,
+                                       SkBudgeted budgeted) {
+    if (!ctx) {
+        return nullptr;
+    }
+    SkAutoTUnref<GrTexture> texture(GrUploadPixmapToTexture(ctx, pixmap));
+    if (!texture) {
+        return nullptr;
+    }
+    return new SkImage_Gpu(texture->width(), texture->height(), kNeedNewImageUniqueID,
+                           pixmap.alphaType(), texture, budgeted);
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+SkImage* SkImageTextureData::newImage(GrContext* context, SkBudgeted budgeted) const {
+    if (context->uniqueID() != fContextUniqueID) {
+        return nullptr;
+    }
+    SkPixmap pixmap;
+    fPixmapGenerator(&pixmap);
+    return SkImage::NewTextureFromPixmap(context, pixmap, budgeted);
+}
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 GrTexture* GrDeepCopyTexture(GrTexture* src, SkBudgeted budgeted) {
     GrContext* ctx = src->getContext();
 
     GrSurfaceDesc desc = src->desc();
     GrTexture* dst = ctx->textureProvider()->createTexture(desc, budgeted, nullptr, 0);
     if (!dst) {
         return nullptr;
     }
 
     const SkIRect srcR = SkIRect::MakeWH(desc.fWidth, desc.fHeight);
     const SkIPoint dstP = SkIPoint::Make(0, 0);
     ctx->copySurface(dst, src, srcR, dstP);
     ctx->flushSurfaceWrites(dst);
     return dst;
 }