Pull up all apps interaction

First phase implementation: dragging and animation interaction is implemented
namely in two classes. ScrollGestureDetector and AllAppsTransitionController.

FeatureFlag.LAUNCHER#_ALL_APPS_PULL_UP will be true for only AOSP and
not in the extending builds. This way, we can safely iterate without
turning it on the shipped ready version.
b/28917826

Change-Id: I0501309c0121880ffe0555f82d6ac5a145581bb1

src/com/android/launcher3/allapps/AllAppsSearchBarController.java

@@ -49,6 +49,9 @@ public abstract class AllAppsSearchBarController
     protected DefaultAppSearchAlgorithm mSearchAlgorithm;
     protected InputMethodManager mInputMethodManager;
 
+    public void setVisibility(int visibility) {
+        mInput.setVisibility(visibility);
+    }
     /**
      * Sets the references to the apps model and the search result callback.
      */