UI fixes to All apps pull up work

b/28917826
- nav bar change to light when top of the all apps container
passes y mid point of the status bar
- apps search edit box change when top of the all apps passes
the bottom of nav bar
- Restrict pull up to work only if the ACTION_DOWN event started
from the hotseat.
- Landscape: reverted old padding and margin. Only the interaction
is different.
- Tuning of the motion spec
- Animation duration respects fling speed more agressively.
- and many more small bugs...

Change-Id: Icde4093c41eeab8c9c6d9dc8b7d57adc3b171349

src/com/android/launcher3/InsettableFrameLayout.java

@@ -18,6 +18,10 @@ public class InsettableFrameLayout extends FrameLayout implements
     @ViewDebug.ExportedProperty(category = "launcher")
     protected Rect mInsets = new Rect();
 
+    public Rect getInsets() {
+        return mInsets;
+    }
+
     public InsettableFrameLayout(Context context, AttributeSet attrs) {
         super(context, attrs);
         setOnHierarchyChangeListener(this);
@@ -34,9 +38,6 @@ public class InsettableFrameLayout extends FrameLayout implements
             lp.rightMargin += (newInsets.right - oldInsets.right);
             lp.bottomMargin += (newInsets.bottom - oldInsets.bottom);
         }
-        if (FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP && child instanceof AllAppsContainerView) {
-            lp.setMargins(0, 0, 0, lp.bottomMargin);
-        }
         child.setLayoutParams(lp);
     }