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

quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java

@@ -335,6 +335,14 @@ public abstract class BaseQuickstepLauncher extends Launcher
                 ? new float[] {1, 1} : new float[] {1.1f, 0};
     }
 
+    @Override
+    public float getNormalTaskbarScale() {
+        if (mTaskbarController != null) {
+            return mTaskbarController.getTaskbarScaleOnHome();
+        }
+        return super.getNormalTaskbarScale();
+    }
+
     @Override
     public void onDragLayerHierarchyChanged() {
         onLauncherStateOrFocusChanged();