Refactored the notification animations, improved stack scroller

Animations are now only triggered when absolutely needed.
In addition, the notifications are now not clipped anymore when starting
a drag on them and the notification below the dragged one is fadded in if
necessary.

Change-Id: I80e8b3ea8fb48505edfb3cace6176dfa00c5a659
diff --git a/packages/SystemUI/res/values/ids.xml b/packages/SystemUI/res/values/ids.xml
new file mode 100644
index 0000000..e5168c4
--- /dev/null
+++ b/packages/SystemUI/res/values/ids.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2014 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License
+  -->
+
+<resources>
+    <item type="id" name="translation_y_animator_tag"/>
+    <item type="id" name="translation_z_animator_tag"/>
+    <item type="id" name="alpha_animator_tag"/>
+    <item type="id" name="top_inset_animator_tag"/>
+    <item type="id" name="height_animator_tag"/>
+    <item type="id" name="translation_y_animator_end_value_tag"/>
+    <item type="id" name="translation_z_animator_end_value_tag"/>
+    <item type="id" name="alpha_animator_end_value_tag"/>
+    <item type="id" name="top_inset_animator_end_value_tag"/>
+    <item type="id" name="height_animator_end_value_tag"/>
+</resources>
+