Arrange compositor scrolling into scroll customization format

cc/input/scroll_state_unittest.cc

Index: cc/input/scroll_state_unittest.cc
diff --git a/cc/input/scroll_state_unittest.cc b/cc/input/scroll_state_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5e091df685f2049b3e568fac17c73f7e6596c612
--- /dev/null
+++ b/cc/input/scroll_state_unittest.cc
@@ -0,0 +1,79 @@
+// Copyright 2015 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/input/scroll_state.h"
+
+#include "cc/layers/layer_impl.h"
+#include "cc/test/fake_impl_proxy.h"
+#include "cc/test/fake_layer_tree_host_impl.h"
+#include "cc/test/test_shared_bitmap_manager.h"
+#include "cc/test/test_task_graph_runner.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace cc {
+
+class ScrollStateTest : public testing::Test {};
+
+TEST_F(ScrollStateTest, ConsumeDeltaNative) {
+  const float delta_x = 12.3f;
+  const float delta_y = 3.9f;
+
+  const float delta_x_to_consume = 1.2f;
+  const float delta_y_to_consume = 2.3f;
+
+  ScrollState scrollState(delta_x, delta_y, 0, 0, false /* should_propagate */,
+                          false /* delta_consumed_for_scroll_sequence */,
+                          false /* is_direct_manipulation */);
+  EXPECT_FLOAT_EQ(delta_x, scrollState.delta_x());
+  EXPECT_FLOAT_EQ(delta_y, scrollState.delta_y());
+  EXPECT_FALSE(scrollState.delta_consumed_for_scroll_sequence());
+  EXPECT_FALSE(scrollState.FullyConsumed());
+
+  scrollState.ConsumeDelta(0, 0);
+  EXPECT_FLOAT_EQ(delta_x, scrollState.delta_x());
+  EXPECT_FLOAT_EQ(delta_y, scrollState.delta_y());
+  EXPECT_FALSE(scrollState.delta_consumed_for_scroll_sequence());
+  EXPECT_FALSE(scrollState.FullyConsumed());
+
+  scrollState.ConsumeDelta(delta_x_to_consume, 0);
+  EXPECT_FLOAT_EQ(delta_x - delta_x_to_consume, scrollState.delta_x());
+  EXPECT_FLOAT_EQ(delta_y, scrollState.delta_y());
+  EXPECT_TRUE(scrollState.delta_consumed_for_scroll_sequence());
+  EXPECT_FALSE(scrollState.FullyConsumed());
+
+  scrollState.ConsumeDelta(0, delta_y_to_consume);
+  EXPECT_FLOAT_EQ(delta_x - delta_x_to_consume, scrollState.delta_x());
+  EXPECT_FLOAT_EQ(delta_y - delta_y_to_consume, scrollState.delta_y());
+  EXPECT_TRUE(scrollState.delta_consumed_for_scroll_sequence());
+  EXPECT_FALSE(scrollState.FullyConsumed());
+
+  scrollState.ConsumeDelta(scrollState.delta_x(), scrollState.delta_y());
+  EXPECT_TRUE(scrollState.delta_consumed_for_scroll_sequence());
+  EXPECT_TRUE(scrollState.FullyConsumed());
+}
+
+TEST_F(ScrollStateTest, CurrentNativeScrollingScrollable) {
+  ScrollState scrollState(0, 0, 0, 0, false, false, false);
+
+  FakeImplProxy proxy;
+  TestSharedBitmapManager shared_bitmap_manager;
+  TestTaskGraphRunner task_graph_runner;
+  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager,
+                                  &task_graph_runner);
+
+  scoped_ptr<LayerImpl> layer_impl =
+      LayerImpl::Create(host_impl.active_tree(), 1);
+  scrollState.set_current_native_scrolling_layer(layer_impl.get());
+  EXPECT_EQ(layer_impl, scrollState.current_native_scrolling_layer());
+}
+
+TEST_F(ScrollStateTest, FullyConsumed) {
+  ScrollState scrollState(1, 3, 0, 0, 0, false, false);
+  EXPECT_FALSE(scrollState.FullyConsumed());
+
+  scrollState.ConsumeDelta(1, 3);
+  EXPECT_TRUE(scrollState.FullyConsumed());
+}
+}  // namespace cc