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Jamie Curtis da84eba318 Catch exception and report it when making a network request with invalid URL on Android

Summary:
Currently if you invoke `fetch()` with an invalid URL ("aaa" for
example) you cannot catch the error in javascript since it's not
reported. Instead the entire app crashes.

Fixes #7436 and #18087

Hopefully.

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Fix using fetch on Android with user generated input.

Added relevant unit test

`./scripts/run-android-local-unit-tests.sh` all pass

[ANDROID] [BUGFIX] [fetch] - Allow "unexpected url" exception to be caught on Android when using fetch
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  CATEGORY
[----------]        TYPE
[ CLI      ]   [-------------]      LOCATION
[ DOCS     ]   [ BREAKING    ]   [-------------]
[ GENERAL  ]   [ BUGFIX      ]   [-{Component}-]
[ INTERNAL ]   [ ENHANCEMENT ]   [ {File}      ]
[ IOS      ]   [ FEATURE     ]   [ {Directory} ]   |-----------|
[ ANDROID  ]   [ MINOR       ]   [ {Framework} ] - | {Message} |
[----------]   [-------------]   [-------------]   |-----------|

[CATEGORY] [TYPE] [LOCATION] - 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/18103

Differential Revision: D7097110

Pulled By: hramos

fbshipit-source-id: 69144e8a0f7404d9bcc7c71a94650de36a48c84a

2018-02-27 04:39:01 -08:00