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/GrDrawOpAtlas.cpp b/src/gpu/GrDrawOpAtlas.cpp
index 7fb8aca..eb709f3 100644
--- a/src/gpu/GrDrawOpAtlas.cpp
+++ b/src/gpu/GrDrawOpAtlas.cpp
@@ -522,8 +522,9 @@
     int numPlotsY = fTextureHeight/fPlotHeight;
 
     for (uint32_t i = 0; i < this->maxPages(); ++i) {
-        fProxies[i] = proxyProvider->createProxy(fFormat, desc, kTopLeft_GrSurfaceOrigin,
-                                                 SkBackingFit::kExact, SkBudgeted::kYes);
+        fProxies[i] = proxyProvider->createProxy(fFormat, desc, GrRenderable::kNo,
+                                                 kTopLeft_GrSurfaceOrigin, SkBackingFit::kExact,
+                                                 SkBudgeted::kYes);
         if (!fProxies[i]) {
             return false;
         }