handle null vertex or index buffers in batch

src/gpu/GrInOrderDrawBuffer.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrInOrderDrawBuffer.h"
 
 #include "GrDefaultGeoProcFactory.h"
@@ skipping 129 matching lines @@
         int vertexCount = kVertsPerRect * instanceCount;
 
         const GrVertexBuffer* vertexBuffer;
         int firstVertex;
 
         void* vertices = batchTarget->vertexPool()->makeSpace(vertexStride,
                                                               vertexCount,
                                                               &vertexBuffer,
                                                               &firstVertex);
 
+        if (!vertices || !batchTarget->quadIndexBuffer()) {
+            SkDebugf("Could not allocate buffers\n");
+            return;
+        }
+
         for (int i = 0; i < instanceCount; i++) {
             const Geometry& args = fGeoData[i];
 
             intptr_t offset = GrTCast<intptr_t>(vertices) + kVertsPerRect * i * vertexStride;
             SkPoint* positions = GrTCast<SkPoint*>(offset);
 
             positions->setRectFan(args.fRect.fLeft, args.fRect.fTop,
                                   args.fRect.fRight, args.fRect.fBottom, vertexStride);
             args.fViewMatrix.mapPointsWithStride(positions, vertexStride, kVertsPerRect);
 
@@ skipping 243 matching lines @@
     }
 }
 
 void GrInOrderDrawBuffer::willReserveVertexAndIndexSpace(int vertexCount,
                                                          size_t vertexStride,
                                                          int indexCount) {
     fCommands.closeBatch();
 
     this->INHERITED::willReserveVertexAndIndexSpace(vertexCount, vertexStride, indexCount);
 }