tree 7830dff5e8105c6cf57a9f88331e522bec3eca6f
parent 4595c36e6b78a5ce99629f78a0b88e5ea22af466
author Frank Li <frankli@microsoft.com> 1646788433 +0000
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> 1646788433 +0000

media: Add patterned DroppedFrameCount2/FrameReadBackCount UMAs

This CL adds patterned UMAs to monitor DroppedFrameCount2 and
FrameReadBackCount based on RendererType for video playbacks, e.g. the
MediaFoundationRenderer from MF Frame Server Mode Clear video playbacks.
For DroppedFrameCount2, it is also patterned with Clear/Encrypted.
FrameReadBackCount only applies to Clear video playback.

UMAs added:
- Media.DroppedFrameCount2.{RendererType}.{ClearOrEncrypted}
- Media.FrameReadBackCount.{RendererType}

Manually tested by exercising canvas/video playbacks with/without
enabling of `chrome://flags/#enable-media-foundation-clear`. The
followings are reported/verified in about://histograms:
```
// chrome://flags/#enable-media-foundation-clear enabled:
- Histogram: Media.DroppedFrameCount2.MediaFoundationRenderer.Clear recorded 1 samples, mean = 0.0 (flags = 0x41) [#]
0  -O                                                                        (1 = 100.0%)
1  ...

- Histogram: Media.FrameReadBackCount.MediaFoundationRenderer recorded 1 samples, mean = 2699.0 (flags = 0x41) [#]
0     ...
2008  -O                                                                        (1 = 100.0%) {0.0%}
2786  ...

// chrome://flags/#enable-media-foundation-clear disabled:
- Histogram: Media.DroppedFrameCount2.RendererImpl.Clear recorded 1 samples, mean = 0.0 (flags = 0x41) [#]
0  -O                                                                        (1 = 100.0%)
1  ...

- Histogram: Media.DroppedFrameCount2.RendererImpl.Encrypted recorded 1 samples, mean = 0.0 (flags = 0x41) [#]
0  -O                                                                        (1 = 100.0%)
1  ...

- Histogram: Media.FrameReadBackCount.RendererImpl recorded 1 samples, mean = 1084.0 (flags = 0x41) [#]
0     ...
1043  -O                                                                        (1 = 100.0%) {0.0%}
1447  ...
```

Bug: 1258887
Change-Id: I23c1e81aef66e9bd555fbd2dc0add61a610bd7e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3501242
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Frank Li <frankli@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#978997}