Summary: This is a leftover from recent changes in D6595780 where a prop application step was moved out to separare mount block.

Differential Revision: D6640736

fbshipit-source-id: 70de0f55f992a7912e222ec4bf9ade1c9bad99f2

Summary:
Buck is failing due to missing args: https://circleci.com/gh/facebook/react-native/29268
Closes #17346

Differential Revision: D6642181

Pulled By: hramos

fbshipit-source-id: 399d3c5f197ae0de9748a592def945c14ac1d348

Reviewed By: shergin

Differential Revision: D6639418

fbshipit-source-id: ef973cfebb94325579525bdcd3990737fe576ef8

…rfaceRootShadowView

Summary:
Fix calculating layout in `RCTSurfaceRootShadowView` as the `minWidth` is set doubled in `calculateLayoutWithMinimumSize:maximumSize:`.

cc shergin
Closes #17203

Differential Revision: D6642437

Pulled By: shergin

fbshipit-source-id: 3483c952c9ecf0132182a156b7b916eb1e975424

Summary:
`ScrollView` has a bunch of `onFoo` handlers for scrolling-related events, most of which have a proptype defined and are documented. However, `onScrollBeginDrag` and `onScrollEndDrag` do not currently have a proptype and are not currently documented (as noted at https://stackoverflow.com/a/41793747/1709587). It seems reasonable to bring consistency and to provide documentation of these otherwise hard-to-discover props.

I haven't added or run any tests, and don't plan to do so (beyond waiting and seeing that no existing checks fail in CircleCI).

I have also created a PR to update the documentation at react/react-native-website#99

*(None needed; this isn't a functionality change.)*
Closes #17368

Differential Revision: D6642695

Pulled By: TheSavior

fbshipit-source-id: fa40ed2ae6d5947a161b816a47441d8f5d4d9c4d

Summary:
Related to #15126, and this would be useful for use React DevTools on real device without modify `setupDevtools.js`.

In Android emulator, the host of `SourceCode.scriptURL` is same with `PlatformConstants.ServerHost` so we can just replace it.

* Tested on iOS device with [react-devtools](https://github.com/facebook/react-devtools/tree/master/packages/react-devtools) package.
* Tested on Android emulator, the `getDevServer` module got the correctly hostname so that don't need `adb reverse`.

[ENHANCEMENT] [setupDevtools] Set host of development server for setupDevtools
Closes #15547

Differential Revision: D6544980

Pulled By: javache

fbshipit-source-id: a286874bcef0501c5d2e0be2251d58c236a5534a

Summary:
`renderItem` on `SectionList` is within the `OptionalProps` group of props but it is not actually marked as optional. Which means that doing things such as in the example where each section has its own `renderItem` and no `renderItem` prop is passed into `SectionList` will fail flow.

Create a `SectionList` where each section has it's own `renderItem` and do not pass in a `renderItem` into `SectionList`. Run flow, it should error.

[GENERAL] [MINOR] [SectionList] -Makes `renderItem` prop on `SectionList` optional for flow.
Closes #17262

Differential Revision: D6645672

Pulled By: hramos

fbshipit-source-id: 1096e8c4998c14003cf42f29ea559505082047c1