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philvasseur 3ed076b65a added in snapAlignment for horizontal android scrollView

Summary:
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`snapToAlignment` is available on iOS but not android yet. This PR is to add support for `snapToAlignment` on android as `snapToInterval` was recently added to android and they are very useful together.

Make a `Flatlist` in android with `pagingEnabled`, `horizontal`, `snapToInterval` and `snapToAlignment` set and see how adjusting between the three values of `snapToAlignment` aligns just like it does in iOS.

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[ANDROID] [MINOR] [ScrollView] - On Android, **ScrollView** now takes snapToAlignment like iOS

<!--
  **INTERNAL and MINOR tagged notes will not be included in the next version's final release notes.**

    CATEGORY
  [----------]      TYPE
  [ CLI      ] [-------------]    LOCATION
  [ DOCS     ] [ BREAKING    ] [-------------]
  [ GENERAL  ] [ BUGFIX      ] [ {Component} ]
  [ INTERNAL ] [ ENHANCEMENT ] [ {Filename}  ]
  [ IOS      ] [ FEATURE     ] [ {Directory} ]   |-----------|
  [ ANDROID  ] [ MINOR       ] [ {Framework} ] - | {Message} |
  [----------] [-------------] [-------------]   |-----------|

 EXAMPLES:

 [IOS] [BREAKING] [FlatList] - Change a thing that breaks other things
 [ANDROID] [BUGFIX] [TextInput] - Did a thing to TextInput
 [CLI] [FEATURE] [local-cli/info/info.js] - CLI easier to do things with
 [DOCS] [BUGFIX] [GettingStarted.md] - Accidentally a thing/word
 [GENERAL] [ENHANCEMENT] [Yoga] - Added new yoga thing/position
 [INTERNAL] [FEATURE] [./scripts] - Added thing to script that nobody will see
-->
Closes https://github.com/facebook/react-native/pull/18648

Differential Revision: D7473762

Pulled By: mdvacca

fbshipit-source-id: ad4778b83f9fd1352455b2ed28a5f37229d9d8c7

2018-04-04 20:57:32 -07:00