android: move overscroll effects to ui/

ui/android/window_android_compositor.cc

+// 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 "ui/android/window_android_compositor.h"
+
+#include "base/lazy_instance.h"
+#include "cc/trees/layer_tree_settings.h"
+
+namespace ui {
+
+namespace {
+base::LazyInstance<cc::LayerSettings> g_layer_settings =
+    LAZY_INSTANCE_INITIALIZER;
+} // anonymous namespace
+
+// static
+const cc::LayerSettings& WindowAndroidCompositor::LayerSettings() {
+  return g_layer_settings.Get();
+}
+
+// static
+void WindowAndroidCompositor::SetLayerSettings(
+    const cc::LayerSettings& settings) {
+  g_layer_settings.Get() = settings;
+}
+
+}  // namespace ui