Remove GrFlushToGpuDrawTarget and move functionality up to GrDrawTarget.

src/gpu/GrTargetCommands.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 GrTargetCommands_DEFINED
 #define GrTargetCommands_DEFINED
 
@@ skipping 107 matching lines @@
                          const float transformValues[],
                          GrDrawTarget::PathTransformType ,
                          int,
                          const GrStencilSettings&,
                          const GrDrawTarget::PipelineInfo&);
     Cmd* recordClear(GrInOrderDrawBuffer*,
                      const SkIRect* rect,
                      GrColor,
                      bool canIgnoreRect,
                      GrRenderTarget*);
-    Cmd* recordCopySurface(GrInOrderDrawBuffer*,
-                           GrSurface* dst,
+    Cmd* recordCopySurface(GrSurface* dst,
                            GrSurface* src,
                            const SkIRect& srcRect,
                            const SkIPoint& dstPoint);
 
 protected:
     void willReserveVertexAndIndexSpace(int vertexCount,
                                         size_t vertexStride,
                                         int indexCount);
 
 private:
@@ skipping 175 matching lines @@
      // TODO hack until batch is everywhere
      GrTargetCommands::DrawBatch*        fDrawBatch;
 
      // This will go away when everything uses batch.  However, in the short term anything which
      // might be put into the GrInOrderDrawBuffer needs to make sure it closes the last batch
      void closeBatch();
 };
 
 #endif