Bug 1071445 - [Settings]Cap letter for titles on panels based on new Building Blocks
Bug 1042241 - Avoid encoding/decoding clip canvas r=kgrandon

We can just paint the one canvas to the other directly. This
avoids the png encoding/decoding time and will reduce peak memory.
Bug 1071445 - Follow-up, update marionette test values r=kgrandon
Merge pull request #24627 from KevinGrandon/reland_bug_1071445

Bug 1071445 - [Settings]Cap letter for titles on panels based on new Building Blocks