Root cause:
The width and height of animated image are wrap_content. It causes the gif or drawable which are non-transparent background to have a little weird display under dark mode.
Next:
1. Revise the width from wrap_content to match_parent, and add the fit center scale type.
2. Correct the function usage
Bug: 155946967
Test: manual test
Change-Id: I7470efb945a2b3bedb695e1b6f34475c6f190f9d
Goal: 1. let third party developer can use html text that include from their local image file and
animated image instead of only plain text to rich their content.
2. Avoid malicious links made by third party developer
Action: 1. Add html, static text, and animated image preferences.
2. Add android:AnimatedImageDrawable, and android:htmlDescription attributes.
3. Fine-tune interface and integration
4. Add custom tag filter
Bug: 136292241
Test: Maunal & make RunSettingsRoboTests
Change-Id: I82cd5319efb7faa1ff7e8354a279828fce5135b8
