Move SurfaceSequenceGenerator => cc/surfaces

cc/trees/surface_sequence_generator_unittest.cc

-// Copyright 2016 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/trees/surface_sequence_generator.h"
-
-#include "cc/surfaces/surface_sequence.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace cc {
-namespace {
-
-static constexpr FrameSinkId kArbitraryFrameSinkId(1, 1);
-
-TEST(SurfaceSequenceGeneratorTest, Basic) {
-  SurfaceSequenceGenerator generator;
-  generator.set_frame_sink_id(kArbitraryFrameSinkId);
-  SurfaceSequence sequence1 = generator.CreateSurfaceSequence();
-  SurfaceSequence sequence2 = generator.CreateSurfaceSequence();
-  EXPECT_NE(sequence1, sequence2);
-}
-
-}  // namespace
-}  // namespace cc