tools/android/loading: Implements loading_trace_analyzer.py requests
tools/android/loading: Implements loading_trace_analyzer.py requests

Command line tool design to quickly analyse a loading trace to
debug the upcoming cache modification tool.

BUG=582080

Review URL: https://codereview.chromium.org/1708253002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#376737}

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