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And also unifies the timestamp logging approach across dex.py,
compile_java.py, compile_resources.py via a build_utils.py helper.

Looks like we should cache png->webp. Here's the output from chrome_apk:

I 232916     29 Started
D 232916     40 Extracting resource .zips
D 232916    427 Applying locale transformations
D 232916    598 Applying file-based blacklist
D 232916    652 Converting png->webp
D 232916  15519 Applying drawable transformations
D 232916  16776 Starting: aapt2 link
D 232916  16795 Created .res.info file
D 232916  18066 Finished: aapt2 link
D 232916  18072 Running: aapt2 optimize
D 232916  18622 Creating R.srcjar
D 232916  19088 Performing sanity check
D 232916  19263 Copying outputs
I 232916  19417 Job's done.

Change-Id: I204cf6ad5e867b2ae83eb2a5f19efb00c14bc7e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1977060
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726951}