Hydrogen logs are ambiguous if multiple functions share the same name.
This change adds file names to this output. Functions are now named
<file_name>:<function_name> to reduce this ambiguity.

R=ofrobots@google.com
BUG=

Review-Url: https://codereview.chromium.org/1913973004
Cr-Commit-Position: refs/heads/master@{#36076}