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tools/cygprofile (and its dependencies, among them //base) are built
without instrumentation, as the previous version of it was calling
//base functions, and to avoid infinite recursion. This is no longer
necessary.
Removing this has two benefits:
- More code is instrumented (as some parts of //base were off-limits)
- Simpler build files.

Also:
- Explain why //tools/cygprofile is a dependency of
  //tools/android/md5sum
- Instrument libwebp, and remove the opt-out of instrumentation

TBR=digit

Bug: 758566
Change-Id: I62cad01d216adbab759c62c42d2baa08f7a8a0b1
Reviewed-on: https://chromium-review.googlesource.com/985973
Commit-Queue: Benoit L <lizeb@chromium.org>
Reviewed-by: Egor Pasko <pasko@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Reviewed-by: James Zern <jzern@google.com>
Cr-Commit-Position: refs/heads/master@{#548005}