1. Remove tag checker in HtmlTextPreference.
2. Set the max height for AnimatedImagePreference.
Bug: 149516547
Test: manaul test
Change-Id: I98f49d055db9427d91a3f1ca816e94a11d29cd3d
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
