Clean LayerImpl's scroll offset callers in unit tests.

cc/test/layer_tree_test.h

Index: cc/test/layer_tree_test.h
diff --git a/cc/test/layer_tree_test.h b/cc/test/layer_tree_test.h
index 5a7f111aa305dbcdfb8127d54b4a44b2aa0856c8..2b9a91a864285f325fdd15209d39f59e1c53776c 100644
--- a/cc/test/layer_tree_test.h
+++ b/cc/test/layer_tree_test.h
@@ -191,6 +191,16 @@ class LayerTreeTest : public testing::Test, public TestHooks {
 
   bool IsRemoteTest() const;
 
+  static gfx::Vector2dF ScrollDelta(LayerImpl* layer_impl) {
+    if (layer_impl->IsActive())
+      return gfx::Vector2dF(layer_impl->synced_scroll_offset()->Delta().x(),
+                            layer_impl->synced_scroll_offset()->Delta().y());
+    else
+      return gfx::Vector2dF(
+          layer_impl->synced_scroll_offset()->PendingDelta().get().x(),
+          layer_impl->synced_scroll_offset()->PendingDelta().get().y());
+  }
+
  private:
   LayerTreeSettings settings_;
   LayerSettings layer_settings_;