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This patch adds some traces in the APIs that are called when the IME
on Windows tries to position the candidate window and start a new
composition. These traces would be really useful while trying to
debug IME related issues which are also hard to debug in a debugger
as they are sensitive to timings and focus loss.

Bug: 1152893, 1151301

Change-Id: I1f0e36d4f9524190efb6b3404d0eb96ee5c85679
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572800
Commit-Queue: Anupam Snigdha <snianu@microsoft.com>
Reviewed-by: Yohei Yukawa <yukawa@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834436}