Slightly improve Taskbar animations to launcher

- Move Taskbar scale to LauncherState
- Rename TaskbarVisibilityController to TaskbarAnimationController and
  add mTaskbarScaleForLauncherState to TaskbarAnimationController
- Set OverviewState#getTaskbarScale() = 1f so Taskbar doesn't scale
  up when going from an app to Overview
- Increase home animation duration so Taskbar animation aligns better

Test: Taskbar scales up when going home, doesn't scale up when going
to overview
Bug: 182512211

Change-Id: I6f448e76de98d7ff337ae93234d4bb7ce6254d50
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 89c0f66..8785fbc 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -2763,6 +2763,13 @@
         return new float[] {NO_SCALE, NO_OFFSET};
     }
 
+    /**
+     * @see LauncherState#getTaskbarScale(Launcher)
+     */
+    public float getNormalTaskbarScale() {
+        return 1f;
+    }
+
     public static Launcher getLauncher(Context context) {
         return fromContext(context);
     }