Summary:
Now `RCTAnimationExperimentalManager` is not working on 32bit devices.
```
NSValue *fromValue = [view.layer.presentationLayer valueForKeyPath:keypath];
CGFloat fromFields[count];
[fromValue getValue:fromFields];
```
If the fromValue is kind of double value which needs two bytes in 32bit device and the count is 1, the fromFileds array will go wrong.
Closes https://github.com/facebook/react-native/pull/1725
Github Author: =?UTF-8?q?=E9=9A=90=E9=A3=8E?= <yinfeng.fcx@alibaba-inc.com>
Test Plan: Imported from GitHub, without a `Test Plan:` line.
Summary:
[CATransaction Class Reference](https://developer.apple.com/library/mac/documentation/GraphicsImaging/Reference/CATransaction_class/index.html)
In Tasks > Getting and Setting Completion Block Objects > Discussion:
The completion block object that is guaranteed to be called (on the main thread) as soon as all animations subsequently added by this transaction group have completed (or have been removed.) If no animations are added before the current transaction group is committed (or the completion block is set to a different value,) the block will be invoked immediately.
Closes https://github.com/facebook/react-native/pull/1400
Github Author: Shuangzuan <shuangzuan.he@icloud.com>
Test Plan: Imported from GitHub, without a `Test Plan:` line.
