Revert of Don't allow nullptr in texels array params (unless using a transfer buffer).

src/gpu/GrGpu.h

Index: src/gpu/GrGpu.h
diff --git a/src/gpu/GrGpu.h b/src/gpu/GrGpu.h
index 5b4c05a0fd6b86d46d534d4743c5ef9fe1d15baa..5d35fcf859bca3792681e9e6ff5037e92fc9fdf0 100644
--- a/src/gpu/GrGpu.h
+++ b/src/gpu/GrGpu.h
@@ -96,13 +96,22 @@
                              const SkTArray<GrMipLevel>& texels);
 
     /**
-     * Simplified createTexture() interface when there is no initial texel data
-     * to upload.
-     */
-    GrTexture* createTexture(const GrSurfaceDesc& desc, SkBudgeted budgeted) {
-        return this->createTexture(desc, budgeted, SkTArray<GrMipLevel>());
-    }
-    
+     * This function is a shim which creates a SkTArGrMipLevell> of size 1.
+     * It then calls createTexture with that SkTArray.
+     *
+     * @param srcData  texel data to load texture. Begins with full-size
+     *                 palette data for paletted texture. For compressed
+     *                 formats it contains the compressed pixel data. Otherwise,
+     *                 it contains width*height texels. If nullptr texture data
+     *                 is uninitialized.
+     * @param rowBytes the number of bytes between consecutive rows. Zero
+     *                 means rows are tightly packed. This field is ignored
+     *                 for compressed pixel formats.
+     * @return    The texture object if successful, otherwise, nullptr.
+     */
+    GrTexture* createTexture(const GrSurfaceDesc& desc, SkBudgeted budgeted,
+                             const void* srcData, size_t rowBytes);
+
     /**
      * Implements GrTextureProvider::wrapBackendTexture
      */