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

src/gpu/batches/GrVertexBatch.cpp

Index: src/gpu/batches/GrVertexBatch.cpp
diff --git a/src/gpu/batches/GrVertexBatch.cpp b/src/gpu/batches/GrVertexBatch.cpp
index 5897fe95c47bcbfeb709b0fdd121e3ecade42380..be56100d7074962fd3ecf744a137be21981add43 100644
--- a/src/gpu/batches/GrVertexBatch.cpp
+++ b/src/gpu/batches/GrVertexBatch.cpp
@@ -16,7 +16,7 @@ void GrVertexBatch::onPrepare(GrBatchFlushState* state) {
     this->onPrepareDraws(&target);
 }
 
-void* GrVertexBatch::InstancedHelper::init(Target* target, GrPrimitiveType primType,
+void* GrVertexBatch::InstancedHelper::init(Target* target,
                                            size_t vertexStride, const GrIndexBuffer* indexBuffer,
                                            int verticesPerInstance, int indicesPerInstance,
                                            int instancesToDraw) {
@@ -36,7 +36,7 @@ void* GrVertexBatch::InstancedHelper::init(Target* target, GrPrimitiveType primT
     size_t ibSize = indexBuffer->gpuMemorySize();
     int maxInstancesPerDraw = static_cast<int>(ibSize / (sizeof(uint16_t) * indicesPerInstance));
 
-    fVertices.initInstanced(primType, vertexBuffer, indexBuffer,
+    fVertices.initInstanced(vertexBuffer, indexBuffer,
         firstVertex, verticesPerInstance, indicesPerInstance, instancesToDraw,
         maxInstancesPerDraw);
     return vertices;
@@ -55,8 +55,8 @@ void* GrVertexBatch::QuadHelper::init(Target* target, size_t vertexStride,
         SkDebugf("Could not get quad index buffer.");
         return nullptr;
     }
-    return this->INHERITED::init(target, kTriangles_GrPrimitiveType, vertexStride,
-                                 quadIndexBuffer, kVerticesPerQuad, kIndicesPerQuad, quadsToDraw);
+    return this->INHERITED::init(target, vertexStride, quadIndexBuffer, kVerticesPerQuad,
+                                 kIndicesPerQuad, quadsToDraw);
 }
 
 void GrVertexBatch::onDraw(GrBatchFlushState* state) {
@@ -72,15 +72,11 @@ void GrVertexBatch::onDraw(GrBatchFlushState* state) {
             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.fPrimitiveType,
+                           drawArray.fDraws.begin(),
+                           drawArray.fDraws.count());
     }
 }