Add support for creating texture backed images where Skia will delete the texture.

Review URL: https://codereview.chromium.org/1187523005
diff --git a/tests/GrPorterDuffTest.cpp b/tests/GrPorterDuffTest.cpp
index 730d7bd..def7280 100644
--- a/tests/GrPorterDuffTest.cpp
+++ b/tests/GrPorterDuffTest.cpp
@@ -966,7 +966,8 @@
     fakeDesc.fConfig = kRGBA_8888_GrPixelConfig;
     fakeDesc.fWidth = fakeDesc.fHeight = 100;
     fakeDesc.fTextureHandle = 1;
-    SkAutoTUnref<GrTexture> fakeTexture(ctx->resourceProvider()->wrapBackendTexture(fakeDesc));
+    SkAutoTUnref<GrTexture> fakeTexture(ctx->resourceProvider()->wrapBackendTexture(fakeDesc,
+        kBorrow_GrWrapOwnership));
     GrXferProcessor::DstTexture fakeDstTexture;
     fakeDstTexture.setTexture(fakeTexture);