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[content] Annotate WebContentsImpl methods with trace events

WebContentsImpl is a major class responsible for routing many events
between different parts of //content and between //content and the rest
of the codebase (e.g. //chrome and //components).

Add trace events to all non-trivial methods to ensure that it's possible
to understand the execution flow from reading the trace.

Together with crrev.com/2343269 this in particular would allow the
user of the tracing to know which WebContentsObserver notifications were
dispatched.

R=nasko@chromium.org
BUG=1043616

Change-Id: If00550c233ab16186a2ebf9f4042c5f1fd457fdd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2240326
Commit-Queue: Alexander Timin <altimin@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804869}