Ensure resizeImage's canvas has at least 1px of width and height

[cheapsteak]

Summary

This PR fixes/implements the following bugs/features

• fixes Bug Error when drawing images with fractional heights that scale to less than 1px #2408

Explain the motivation for making this change. What existing problem does the pull request solve?

CanvasRenderer.resizeImage throws when passed in an image that, after resizing, has a height of less than 1px

Test plan (required)

Added a test for background image slivers to reftests/background/size.html

Have tested that test fails with Failed to execute 'createPattern' on 'CanvasRenderingContext2D' error before the fix, and passes after the fix

Closing issues

Fixes #2408

[abdurrahmanyildirim]

Hi @cheapsteak , Could you update your solution with this ?

canvas.width = isNaN(width) || width === 0 ? 1 : width;
canvas.height = isNaN(height) || height === 0 ? 1 : height;

At my app, width comes with NaN value and Math.max(1,width) gives NaN result so it gives error.

@niklasvh Could you update this solution?