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This change introduces "BigTrace UI", a
standalone bigtrace query interface within perfetto UI source code.
BigTrace provides a focused environment for executing and managing complex SQL queries
against traces.
Key features and components:
singleton (BigTraceApp) managing its own command and omnibox instances.
persistent tabs, syntax-highlighted editors, and result limiting.
rendering of SQL query results, including support for linkified
columns and uuid-based row tracking.
components (Sidebar, Topbar, Omnibox) tailored for the BigTrace
experience.
history, and user preferences across sessions.
for configuring Brush-specific parameters, such as backend endpoints
and default result limits.
help modal detailing available keyboard shortcuts.
modern aesthetic.
Note: we may have duplicated classes/interfaces between Bigtrace UI and Perfetto UI, because we wanted to isolate the changes and avoid exposing classes/interfaces from Perfetto UI. In a follow-up, we will expose the classes/interfaces suitable for reuse.