opened
PureWeen
username_0
### Description of Change ###
Clip button and image button so if the user specifies a corner radius the image will get clipped as well.

This is how iOS and UWP already work

### Issues Resolved ### 
- fixes #4606


### Platforms Affected ### 
- Android


### Before/After Screenshots ### 
```XAML
<StackLayout>
        <StackLayout Orientation="Horizontal">
            <ImageButton BorderWidth="2" BorderColor="Blue" WidthRequest="50" CornerRadius="25" Source="coffee.png" BackgroundColor="Purple"  />
            <ImageButton BorderWidth="2" BorderColor="Blue" WidthRequest="50" CornerRadius="25" Source="coffee.png" BackgroundColor="Purple"  />
        </StackLayout>
        <StackLayout Orientation="Horizontal" Visual="Material">
            <ImageButton BorderWidth="2" BorderColor="Blue" WidthRequest="50" CornerRadius="25" Source="coffee.png" BackgroundColor="Purple"  />
            <ImageButton BorderWidth="2" BorderColor="Blue" WidthRequest="50" CornerRadius="25" Source="coffee.png" BackgroundColor="Purple"  />            
        </StackLayout>
    </StackLayout>
```

Before

![image](https://user-images.githubusercontent.com/5375137/65807740-38039100-e14d-11e9-8c2a-ffcf136753c9.png)

After

![image](https://user-images.githubusercontent.com/5375137/65807981-b9a7ee80-e14e-11e9-9e5a-71be3f89bd1c.png)


### Testing Procedure ###
- run the included UI Test (make sure to enable fast renderers)

### PR Checklist ###
<!-- To be completed by reviewers -->

- [ ] Targets the correct branch
- [ ] Tests are passing (or failures are unrelated)
Fix corner clipping on ImageButton and Button (FR)
issue
created
samhouts
username_1
@username_0 Please rebase :)
comment
created
Syed-Esqimo
username_2
Yay..... Thanks guys!
comment