Reverted commit D3278698

Summary:
= Breaking Change (for experimental features) =

Major API changes in  NavigationAnimatedView

= New prop `transition` for scene renderer

In NavigationAnimatedView, we should not use `position` as a proxy of the
transtion which happens whenever navigation state changes.

Because `position` does not change unless navigation index changes, it won't
be possible to build animations for actions that replace navigation state
without changing the index.

This diff introduces an abstract prop `transition` that is exposed to the scene
renderers.

= Replace `applyAnimation` with `configureTransition`.

Expose a new optional prop  `configureTransition` that allows people to configure
transitions easily.

For instance, to configure the transition, do this:

```
function configureTransition() {
  return {
    dutation: 123,
    easing: Easing.easeInOut,
  };
}

```
<NavigationAnimatedView configureTransition={configureTransition) />

```

Reviewed By: ericvicenti

Differential Revision: D3278698

fbshipit-source-id: b790b92e0fabb42488ff1135b1c37a3f0e9420f7

Libraries/NavigationExperimental/NavigationTypeDefinition.js

@@ -41,6 +41,8 @@ export type NavigationLayout = {
   width: NavigationAnimatedValue,
 };
 
+export type NavigationPosition = NavigationAnimatedValue;
+
 export type NavigationScene = {
   index: number,
   isStale: boolean,
@@ -59,20 +61,13 @@ export type NavigationSceneRendererProps = {
   onNavigate: NavigationActionCaller,
 
   // The progressive index of the containing view's navigation state.
-  position: NavigationAnimatedValue,
+  position: NavigationPosition,
 
   // The scene to render.
   scene: NavigationScene,
 
   // All the scenes of the containing view's.
   scenes: Array<NavigationScene>,
-
-  // The value that represents the progress of the transition when navigation
-  // state changes from one to another. Its numberic value will range from 0
-  // to 1.
-  //  transition.__getAnimatedValue() < 1 : transtion is happening.
-  //  transition.__getAnimatedValue() == 1 : transtion completes.
-  transition: NavigationAnimatedValue,
 };
 
 export type NavigationPanPanHandlers = {
@@ -90,12 +85,6 @@ export type NavigationPanPanHandlers = {
   onStartShouldSetResponderCapture: Function,
 };
 
-export type NavigationTransitionSpec = {
-  duration: number,
-  // An easing function from `Easing`.
-  easing: () => any,
-};
-
 // Functions.
 
 export type NavigationActionCaller = Function;
@@ -123,5 +112,3 @@ export type NavigationSceneRenderer = (
 export type NavigationStyleInterpolator = (
   props: NavigationSceneRendererProps,
 ) => Object;
-
-export type NavigationTransitionConfigurator = () => NavigationTransitionSpec;