Summary:
We had rendering support for prev links, but we never had any previous links in our metadata. Only next links. This adds that support to both Guides and APIs.
**For guides**: `previous` is manually inserted into the metadata of the actual markdown file.
**For APIs/Components**: `previous` is established via code within `extractDocs.js`
> This isn't totally perfect. For example, the transition from the last guide to the first API/component has a next link from the guide, but not a previous link from the API since the way you get the previous links are different from guides and APIs. But this gets us really close.
Closes https://github.com/facebook/react-native/pull/8754
Differential Revision: D3557972
Pulled By: hramos
fbshipit-source-id: e270bb51e7a4f59f61dad28ae0928d27d0af3d4a
Summary:
Right now systrace generates an html file that is using the Object.observe function which is now deprecated in most up to date browsers.
Since we don't want to depend on the systrace being up to date, we should advise opening the trace through the Tracing tool, since that is the only way to get it working until systrace removes its dependency on Object.observe.
Closes https://github.com/facebook/react-native/pull/7880
Differential Revision: D3516305
Pulled By: astreet
fbshipit-source-id: ab9ae46ba74b7a34b6cfb8c37ca1ec2e6b41e353