Revert of Move instanced index buffer creation to flush time

src/gpu/GrBatchTarget.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrBatchBuffer_DEFINED
 #define GrBatchBuffer_DEFINED
 
@@ skipping 103 matching lines @@
     GrBatchTracker* currentBatchTracker() {
         SkASSERT(!fFlushBuffer.empty());
         return &fFlushBuffer.back().fBatchTracker;
     }
 
     const GrDrawTargetCaps& caps() const { return *fGpu->caps(); }
 
     GrVertexBufferAllocPool* vertexPool() { return fVertexPool; }
     GrIndexBufferAllocPool* indexPool() { return fIndexPool; }
 
-    GrResourceProvider* resourceProvider() const { return fGpu->getContext()->resourceProvider(); }
+    const static int kVertsPerRect = 4;
+    const static int kIndicesPerRect = 6;
+    const GrIndexBuffer* quadIndexBuffer() const { return fGpu->getQuadIndexBuffer(); }
 
     // A helper for draws which overallocate and then return data to the pool
     void putBackIndices(size_t indices) { fIndexPool->putBack(indices * sizeof(uint16_t)); }
 
     void putBackVertices(size_t vertices, size_t vertexStride) {
         fVertexPool->putBack(vertices * vertexStride);
     }
 
 private:
     GrGpu* fGpu;
@@ skipping 24 matching lines @@
     FlushBuffer::Iter fIter;
     int fNumberOfDraws;
     BatchToken fCurrentToken;
     BatchToken fLastFlushedToken; // The next token to be flushed
     SkTArray<SkAutoTUnref<Uploader>, true> fAsapUploads;
     SkTArray<SkAutoTUnref<Uploader>, true> fInlineUploads;
     int fInlineUpdatesIndex;
 };
 
 #endif