Add EXPERIMENTAL_beginRecording() for SkRecord-based recording.

src/core/SkRecordDraw.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkRecordDraw.h"
 
 void SkRecordDraw(const SkRecord& record, SkCanvas* canvas) {
@@ skipping 51 matching lines @@
 DRAW(DrawText, drawText(r.text, r.byteLength, r.x, r.y, r.paint));
 DRAW(DrawTextOnPath, drawTextOnPath(r.text, r.byteLength, r.path, r.matrix, r.paint));
 DRAW(DrawVertices, drawVertices(r.vmode, r.vertexCount, r.vertices, r.texs, r.colors,
                                 r.xmode.get(), r.indices, r.indexCount, r.paint));
 #undef DRAW
 
 template <> void Draw::draw(const PairedPushCull& r) { this->draw(*r.base); }
 template <> void Draw::draw(const BoundedDrawPosTextH& r) { this->draw(*r.base); }
 
 }  // namespace SkRecords