Connect LTHI::ScrollAnimated to cc::Viewport

cc/layers/viewport_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/layers/viewport.h"
+
+#include <stddef.h>
+
+#include "cc/test/layer_test_common.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace cc {
+
+TEST(ViewportTest, ShouldAnimateViewport) {
+  EXPECT_TRUE(Viewport::ShouldAnimateViewport(gfx::Vector2dF(10, 1),
+                                              gfx::Vector2dF(8, 5)));
+  EXPECT_TRUE(Viewport::ShouldAnimateViewport(gfx::Vector2dF(0, 10),
+                                              gfx::Vector2dF(4, 8)));
+  EXPECT_TRUE(Viewport::ShouldAnimateViewport(gfx::Vector2dF(10, 10),
+                                              gfx::Vector2dF(8, 9)));
+
+  EXPECT_FALSE(Viewport::ShouldAnimateViewport(gfx::Vector2dF(8, 10),
+                                               gfx::Vector2dF(8, 10)));
+  EXPECT_FALSE(Viewport::ShouldAnimateViewport(gfx::Vector2dF(8, 10),
+                                               gfx::Vector2dF(10, 0)));
+  EXPECT_FALSE(Viewport::ShouldAnimateViewport(gfx::Vector2dF(10, 10),
+                                               gfx::Vector2dF(10, 18)));
+}
+
+}  // namespace cc