Update how we send draws to gpu backend to reduce state setting.

src/gpu/batches/GrVertexBatch.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 "GrVertexBatch.h"
 #include "GrBatchFlushState.h"
 #include "GrResourceProvider.h"
@@ skipping 18 matching lines @@
     int vertexCount = verticesPerInstance * instancesToDraw;
     void* vertices = target->makeVertexSpace(vertexStride, vertexCount, &vertexBuffer, &firstVertex);
     if (!vertices) {
         SkDebugf("Vertices could not be allocated for instanced rendering.");
         return nullptr;
     }
     SkASSERT(vertexBuffer);
     size_t ibSize = indexBuffer->gpuMemorySize();
     int maxInstancesPerDraw = static_cast<int>(ibSize / (sizeof(uint16_t) * indicesPerInstance));
 
-    fVertices.initInstanced(primType, vertexBuffer, indexBuffer,
+    fMesh.initInstanced(primType, vertexBuffer, indexBuffer,
         firstVertex, verticesPerInstance, indicesPerInstance, instancesToDraw,
         maxInstancesPerDraw);
     return vertices;
 }
 
 void GrVertexBatch::InstancedHelper::recordDraw(Target* target) {
-    SkASSERT(fVertices.instanceCount());
-    target->draw(fVertices);
+    SkASSERT(fMesh.instanceCount());
+    target->draw(fMesh);
 }
 
 void* GrVertexBatch::QuadHelper::init(Target* target, size_t vertexStride,
                                       int quadsToDraw) {
     SkAutoTUnref<const GrIndexBuffer> quadIndexBuffer(
         target->resourceProvider()->refQuadIndexBuffer());
     if (!quadIndexBuffer) {
         SkDebugf("Could not get quad index buffer.");
         return nullptr;
     }
     return this->INHERITED::init(target, kTriangles_GrPrimitiveType, vertexStride,
                                  quadIndexBuffer, kVerticesPerQuad, kIndicesPerQuad, quadsToDraw);
 }
 
 void GrVertexBatch::onDraw(GrBatchFlushState* state) {
     int uploadCnt = fInlineUploads.count();
     int currUpload = 0;
 
     // Iterate of all the drawArrays. Before issuing the draws in each array, perform any inline
     // uploads.
     for (DrawArrayList::Iter da(fDrawArrays); da.get(); da.next()) {
         state->advanceLastFlushedToken();
         while (currUpload < uploadCnt &&
                fInlineUploads[currUpload]->lastUploadToken() <= state->lastFlushedToken()) {
             fInlineUploads[currUpload++]->upload(state->uploader());
         }
         const GrVertexBatch::DrawArray& drawArray = *da.get();
-        GrProgramDesc desc;
-        const GrPipeline* pipeline = this->pipeline();
-        const GrPrimitiveProcessor* primProc = drawArray.fPrimitiveProcessor.get();
-        state->gpu()->buildProgramDesc(&desc, *primProc, *pipeline);
-        GrGpu::DrawArgs args(primProc, pipeline, &desc);
 
-        int drawCount = drawArray.fDraws.count();
-        for (int i = 0; i < drawCount; i++) {
-            state->gpu()->draw(args,  drawArray.fDraws[i]);
-        }
+        state->gpu()->draw(*this->pipeline(),
+                           *drawArray.fPrimitiveProcessor.get(),
+                           drawArray.fDraws.begin(),
+                           drawArray.fDraws.count());
     }
 }