Back PaintRecord with PaintOpBuffer instead of SkPicture

cc/paint/paint_op_buffer_unittest.cc

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cc/paint/paint_op_buffer.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace cc {
+
+TEST(PaintOpBufferTest, Empty) {
+  PaintOpBuffer buffer;
+  EXPECT_EQ(buffer.approximateOpCount(), 0);
+  EXPECT_EQ(buffer.approximateBytesUsed(), 0u);
+
+  buffer.Reset();
+  EXPECT_EQ(buffer.approximateOpCount(), 0);
+  EXPECT_EQ(buffer.approximateBytesUsed(), 0u);
+}
+
+TEST(PaintOpBufferTest, SimpleAppend) {
+  SkRect rect = SkRect::MakeXYWH(2, 3, 4, 5);
+  PaintFlags flags;
+  flags.setColor(SK_ColorMAGENTA);
+  flags.setAlpha(100);
+  SkColor draw_color = SK_ColorRED;
+  SkBlendMode blend = SkBlendMode::kSrc;
+
+  PaintOpBuffer buffer;
+  buffer.push<SaveLayerOp>(&rect, &flags);
+  buffer.push<SaveOp>();
+  buffer.push<DrawColorOp>(draw_color, blend);
+  buffer.push<RestoreOp>();
+
+  EXPECT_EQ(buffer.approximateOpCount(), 4);
+
+  PaintOpBuffer::Iterator iter(&buffer);
+  ASSERT_EQ(iter->GetType(), PaintOpType::SaveLayer);
+  SaveLayerOp* save_op = static_cast<SaveLayerOp*>(*iter);
+  EXPECT_EQ(save_op->bounds, rect);
+  EXPECT_TRUE(save_op->flags == flags);
+  ++iter;
+
+  ASSERT_EQ(iter->GetType(), PaintOpType::Save);
+  ++iter;
+
+  ASSERT_EQ(iter->GetType(), PaintOpType::DrawColor);
+  DrawColorOp* op = static_cast<DrawColorOp*>(*iter);
+  EXPECT_EQ(op->color, draw_color);
+  EXPECT_EQ(op->mode, blend);
+  ++iter;
+
+  ASSERT_EQ(iter->GetType(), PaintOpType::Restore);
+  ++iter;
+
+  EXPECT_FALSE(iter);
+}
+
+// TODO(enne)
+// * First op with data
+// * First op no data
+// * Resetting and appending
+// * Appending every kind of op, make sure data is stored
+// * Save/restore optimization (need an overridden device, mabye?
+// * Slow path counting
+
+}  // namespace cc