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Implement a helper to get string representation out of C++ types. Use
this to provide tracing of typemapped parameters of mojo
auto-generated methods.

TBR=fdoray@chromium.org

Bug: 1103623
Change-Id: I61e1422bae5647e042aaf1f2718682323fba2db6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2324846
Commit-Queue: Karel Král <karelkral@google.com>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795016}