Implement instanced rendering for simple shapes

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"
+#include "GrInstancedRendering.h"
 #include "GrPathRenderingDrawContext.h"
 #include "GrResourceProvider.h"
 #include "GrSoftwarePathRenderer.h"
 #include "SkTTopoSort.h"
 
 #include "text/GrAtlasTextContext.h"
 #include "text/GrStencilAndCoverTextContext.h"
 
 void GrDrawingManager::cleanup() {
     for (int i = 0; i < fDrawTargets.count(); ++i) {
@@ skipping 12 matching lines @@
     fPathRendererChain = nullptr;
     SkSafeSetNull(fSoftwarePathRenderer);
 }
 
 GrDrawingManager::~GrDrawingManager() {
     this->cleanup();
 }
 
 void GrDrawingManager::abandon() {
     fAbandoned = true;
+    for (int i = 0; i < fDrawTargets.count(); ++i) {
+        if (GrInstancedRendering* ir = fDrawTargets[i]->instancedRendering()) {
+            ir->resetGpuResources(GrInstancedRendering::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 (GrInstancedRendering* ir = fDrawTargets[i]->instancedRendering()) {
+            ir->resetGpuResources(GrInstancedRendering::ResetType::kDestroy);
+        }
+    }
 }
 
 void GrDrawingManager::reset() {
     for (int i = 0; i < fDrawTargets.count(); ++i) {
         fDrawTargets[i]->reset();
     }
     fFlushState.reset();
 }
 
 void GrDrawingManager::flush() {
@@ skipping 115 matching lines @@
         GrStencilAttachment* sb = fContext->resourceProvider()->attachStencilAttachment(rt);
         if (sb) {
             return new GrPathRenderingDrawContext(fContext, this, rt, surfaceProps,
                                                   fContext->getAuditTrail(), fSingleOwner);
         }
     }
 
     return new GrDrawContext(fContext, this, rt, surfaceProps, fContext->getAuditTrail(),
                              fSingleOwner);
 }