[Webkit-unassigned] [Bug 144503] New: Web Inspector: Timeline: Differentiate between CPU and GPU paint

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=144503

            Bug ID: 144503
           Summary: Web Inspector: Timeline: Differentiate between CPU and
                    GPU paint
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tobi+bugzilla at basecode.de
                CC: graouts at webkit.org, joepeck at webkit.org,
                    jonowells at apple.com, mattbaker at apple.com,
                    nvasilyev at apple.com, timothy at apple.com,
                    webkit-bug-importer at group.apple.com

As a user I want to debug the frames of an animation (e.g. CSS Animations) and see if the frame was rendered mostly on the CPU (bad) or on the GPU (good). A user could immediately see if a CSS Property can be rendered efficiently.

## I'd expect a well prepared CSS Animation of a scaling Ball that only uses Transform to mostly be processed on the GPU. Considering the animation contains of 4 frames: 

Frame 1:
[ ] Layout x ms
[ ] Paint (CPU) 10 ms (=> Paint the ball into a Bitmap, send Bitmap and Animation instructions to the Compositor Thread)
[ ] Paint (GPU) 10 ms (=> Upload the Bitmap to GPU and draw to Screen)

Frame 2:
[ ] Paint (GPU) 03 ms (=> Draw Bitmap from GPU memory to screen with scaling 0.5)

Frame 3:
[ ] Paint (GPU) 03 ms (=> Draw Bitmap from GPU memory to screen with scaling 0.6)

Frame 4:
[ ] Paint (GPU) 03 ms (=> Draw Bitmap from GPU memory to screen with scaling 0.7)

## Now I prepare an CSS Animation of a Ball where I change the color from green to blue. The Frames are mostly expected to be processed on the CPU.

Frame 1:
[ ] Layout x ms
[ ] Paint (CPU) 10 ms (=> Paint the ball with 100% green into a Bitmap, send Bitmap to the Compositor Thread)
[ ] Paint (GPU) 10 ms (=> Upload the Bitmap to GPU and draw to Screen)

Frame 2:
[ ] Paint (CPU) 10 ms (=> Paint the ball with 65% green and 35% blue into a Bitmap, send Bitmap to the Compositor Thread)
[ ] Paint (GPU) 10 ms (=> Upload the Bitmap to GPU and draw to Screen)

Frame 3:
[ ] Paint (CPU) 10 ms (=> Paint the ball with 35% green and 65% blue into a Bitmap, send Bitmap to the Compositor Thread)
[ ] Paint (GPU) 10 ms (=> Upload the Bitmap to GPU and draw to Screen)

Frame 4:
[ ] Paint (CPU) 10 ms (=> Paint the ball with 100% blue into a Bitmap, send Bitmap to the Compositor Thread)
[ ] Paint (GPU) 10 ms (=> Upload the Bitmap to GPU and draw to Screen)

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