[chromium] Simplify the compositor texture transforms

• Component: Layout and Rendering
• Status: RESOLVED WONTFIX

[Alok Priyadarshi]

Currently all textures - layers, tiles, and intermediate render surfaces are rendered upside down. The compositor flips the final composited image using the projection matrix. Ganesh produces upright textures, so the accelerated codepath using Ganesh (drawing and canvas) has to flip the textures before feeding to the compositor. This seems unnecessary and confusing. It will be much simpler if all textures were always upright and we never had to flip them.