Images are failing to load sometimes in the exploration player

[BenHenning]

See #1637 (comment) for specifics. More investigation is needed.

How to encounter this error?

1. Using the scripts load the oppia-alpha assets.
2. Uninstall your previous app.
3. Go to MRJeVrKafW6G.json file and change "init_state_name" to Recap 1
4. Using this function mark dummy progress.
5. Run the app.
6. Go to Multiplications
7. Go to 5. Multiplying by power of 10
8. Enter 2 incorrect answer.
9. Click on hint -> reveal.
10. Notice it is empty.

Expected Result
This image should be visible in hint. https://storage.googleapis.com/oppiaserver-resources/exploration/MRJeVrKafW6G/assets/image/img_20200308_213016_u6ap4qq25c_height_313_width_490.png

[BenHenning]

@rt4914 found that UrlImageParser is posting a layout adjustment function for width that's racing against the layout steps in wrap_content cases which can result in a negative maximum image width being computed. Per our discussion, we should force text views in Oppia Android that use HtmlParser to specify a width or use match_parent. It's not yet clear if updating those text views will fix this issue, but it seems likely. Sending over to Rajat to see if this gets fixed with his solution.

[anandwana001]

Putting this video link here for issue reference - https://lh3.googleusercontent.com/Pp2LOc-FuR5ZvsxcEQ8Tt9Ikpqnp_TiQiGH0unuY2tCD54gXumCT4Sp3tK0SjVHefVruXSeSLcUwEJ4=m37

[BenHenning]

Ah, this might be slightly better with #1782 done, but I also realized that we're missing some caching logic for multiple choice options which is causing this to fail for offline cases. One PR should be coming for that.