[telemetry] Add telemetry to SbMedia functions

[borongc]

Adding additional Media Telemetry to cover SbMedia functions.

The rough range of each function:

1. SbMediaIsBufferPoolAllocateOnDemand(): 1us to 2us
2. SbMediaGetInitialBufferCapacity(): 1us to 2us
3. SbMediaGetBufferAllocationUnit(): 1us to 2us
4. SbMediaGetAudioBufferBudget(): 1us to 0.82ms
5. SbMediaGetBufferGarbageCollectionDurationThreshold(): 1us to 0.91ms
6. SbMediaGetVideoBufferBudget(): 1us to 0.123ms

SbMediaGetProgressiveBufferBudget() should be expected to be similar to SbMediaGetVideoBufferBudget().

b/303328238

[joeltine]

FYI I don't think your PR description of ranges matches what the histogram ranges actually are.

[borongc]

FYI I don't think your PR description of ranges matches what the histogram ranges actually are.

This is a very conservative range, as we saw in production, a simple getter function, like Cobalt.Media.HTMLMediaElement.CanPlayType.Timing, can sometimes be up to 5ms, but the majority is about 3us.

Moreover, if they are actually in the order of few microseconds, it should be fine because it indicates that it is not critical to improve them at this moment. If we use the range of [1us, 5ms], it can still capture the range.

In other words, it is okay for right-skewed histogram for us, but we cannot accept the left-skewed histogram.