Remove kRenderTarget_GrSurfaceFlag, instead pass GrRenderable.

This is the last surface desc flag, so remove flags from GrSurfaceDesc.

Bug: skia:6718

Change-Id: Id3ed66b161289927b62f40bfb1f6482cf544deda
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/227858
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/GrBackendTextureImageGenerator.cpp b/src/gpu/GrBackendTextureImageGenerator.cpp
index c673053..a62dfab 100644
--- a/src/gpu/GrBackendTextureImageGenerator.cpp
+++ b/src/gpu/GrBackendTextureImageGenerator.cpp
@@ -192,8 +192,8 @@
                 // unrelated to the whatever SkImage key may be assigned to the proxy.
                 return {std::move(tex), GrSurfaceProxy::LazyInstantiationKeyMode::kUnsynced};
             },
-            format, desc, fSurfaceOrigin, mipMapped, GrInternalSurfaceFlags::kReadOnly,
-            SkBackingFit::kExact, SkBudgeted::kNo);
+            format, desc, GrRenderable::kNo, fSurfaceOrigin, mipMapped,
+            GrInternalSurfaceFlags::kReadOnly, SkBackingFit::kExact, SkBudgeted::kNo);
 
     if (!proxy) {
         return nullptr;