Add test configs for instanced rendering

src/gpu/GrDrawingManager.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDrawContext.h"
 #include "GrDrawingManager.h"
 #include "GrDrawTarget.h"
@@ skipping 27 matching lines @@
     SkSafeSetNull(fSoftwarePathRenderer);
 }
 
 GrDrawingManager::~GrDrawingManager() {
     this->cleanup();
 }
 
 void GrDrawingManager::abandon() {
     fAbandoned = true;
     for (int i = 0; i < fDrawTargets.count(); ++i) {
-        if (InstancedRendering* ir = fDrawTargets[i]->instancedRendering()) {
+        if (GrCaps::InstancedSupport::kNone != fContext->caps()->instancedSupport()) {
+            InstancedRendering* ir = fDrawTargets[i]->instancedRendering();
             ir->resetGpuResources(InstancedRendering::ResetType::kAbandon);
         }
     }
     this->cleanup();
 }
 
 void GrDrawingManager::freeGpuResources() {
     // a path renderer may be holding onto resources
     delete fPathRendererChain;
     fPathRendererChain = nullptr;
     SkSafeSetNull(fSoftwarePathRenderer);
     for (int i = 0; i < fDrawTargets.count(); ++i) {
-        if (InstancedRendering* ir = fDrawTargets[i]->instancedRendering()) {
+        if (GrCaps::InstancedSupport::kNone != fContext->caps()->instancedSupport()) {
+            InstancedRendering* ir = fDrawTargets[i]->instancedRendering();
             ir->resetGpuResources(InstancedRendering::ResetType::kDestroy);
         }
     }
 }
 
 void GrDrawingManager::reset() {
     for (int i = 0; i < fDrawTargets.count(); ++i) {
         fDrawTargets[i]->reset();
     }
     fFlushState.reset();
@@ skipping 124 matching lines @@
                                                         std::move(colorSpace), surfaceProps,
                                                         fContext->getAuditTrail(), fSingleOwner));
         }
     }
 
     return sk_sp<GrDrawContext>(new GrDrawContext(fContext, this, std::move(rt),
                                                   std::move(colorSpace), surfaceProps,
                                                   fContext->getAuditTrail(),
                                                   fSingleOwner));
 }