Implement instanced rendering for simple shapes

src/gpu/GrDrawingManager.cpp

Index: src/gpu/GrDrawingManager.cpp
diff --git a/src/gpu/GrDrawingManager.cpp b/src/gpu/GrDrawingManager.cpp
index 976fbb62a49e0c8ec499ce7f0a66fb6afa295cca..8847efab67ca6d595471c61c61ffc15d01faf99c 100644
--- a/src/gpu/GrDrawingManager.cpp
+++ b/src/gpu/GrDrawingManager.cpp
@@ -8,6 +8,7 @@
 #include "GrDrawContext.h"
 #include "GrDrawingManager.h"
 #include "GrDrawTarget.h"
+#include "GrInstancedRendering.h"
 #include "GrPathRenderingDrawContext.h"
 #include "GrResourceProvider.h"
 #include "GrSoftwarePathRenderer.h"
@@ -40,6 +41,11 @@ GrDrawingManager::~GrDrawingManager() {
 
 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();
 }
 
@@ -48,6 +54,11 @@ void GrDrawingManager::freeGpuResources() {
     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() {