Perfetto

Tracing service and probes:
* Added support for polling power rails on Android from the newer
IPowerStats AIDL interface (previously using only the HAL interface).
* Fixed native heap profiler crash when ABI of heapprofd and profiled
process mismatch.
* Changed encoding format of Anroid managed heap profiler to reduce heap
dump sizes by delta-encoding object IDs.
Trace Processor:
* Added activity create/resume, layout inflation and resource timings to
the Android startup metric.
* Added chrome metadata key/value pairs (e.g. chrome version) into the
`metadata` table with 'cr-' prefixed keys.
* Added dma-buf-based memory metrics reporting total/avg/min/max dmabuf
allocation per-dmabuf-heap and per-process.
* Removed |force_full_sort| flag from config. This has been replaced
by setting the sorting mode to force a full sort.
UI:
* Added tools/symbolize-ui-crash script to resolve crash reports via
TypeScript source maps.
* Fixed newlines when copying Android event log lines into the clipboard.
* Fixed crash when selecting "Did not finish" slices.
* Fixed OOM dialog to give actionable instructions when opening large traces
rather than suggesting to file a bug.
SDK:
* Added /meson.build for bundling /sdk/perfetto.{cc,h} in Meson builds.
* Added support for counter trace points with the TRACE_COUNTER macro.

Tracing service and probes:
* Added ability to sample callstacks using kernel tracepoints as timebase.
* Added abililty to record the perf timebase counter values into the trace,
both combined callstack+counter or counter-only.
* Added abillity to trigger traces based on VM pressure on Android. Requires
a dedicated tracing instance in $tracefs/instances/mm_events.
Trace Processor:
* Added sorting mode to trace processor config to specify how trace
processor should sort events. The |force_full_sort| flag has been
deprecated (with replacement) and will be removed in the next version.
* Added ingestion of frame timeline events into the
{expected,actual}_frame_timeline_slice tables.
* Added support for Mali's trace_marker_write ftrace event.
* Added memory metric based on newer android_fastrpc kernel events.
UI:
* Added flow events support for instant events and async tracks.
* Added support for Android frame timeline events. They allow inspecting
end-to-end expected vs actual app-to-surfaceflinger frame times.
* Added ability to switch between Canary and Stable channels in the UI.
* Added ability to drag&drop to open trace files.
* Changed UI serving infrastructure, old ui versions can be now retrieved by
directly opening https://ui.perfetto.dev/v12.1.269/ .
* Removed thread state track for threads that have no activity.
SDK:
* Use process start time hashed with the process id as a unique process
identifier, allowing multiple independent users of the SDK in the same
process to interleave their events on shared tracks.
* Record process and thread names into the trace.
* Add ring buffer tracing support, i.e., periodic clearing of incremental
state.
Misc:
* Convert python scripts to python3.

Misc:
* Fixed CHANGELOG which was missed in the 12.0 branch cut, causing
mis-labeling of the version code in the v12.x branch as v11.0..N

Tracing service and probes:
* Added more helpful error messages if the client library is used without
having been initialized.
* Added //tools/record_android_trace script to facilitate recording traces
from Android devices, automating start + stop-via-ctrl+c + pull + open.
* Added auto-attachment of traces to Android bugreports if dumpstate is
invoked when a trace with bugreport_score > 0 is running.
SDK:
* Added ability to customize the timestamp of events via
ConvertTimestampToTraceTimeNs().
* Fixed support for category names that contain a space.
Trace Processor:
* Added ingestion and query support for Android end-to-end frame timing
events through the {actual, expected}_frame_timeline_slice tables.
* Added time-to-reportFullyDrawn (Android's API) to startup metrics.
* Fixed excessive memory usage when decoding traces containing callstacks
(https://github.com/google/perfetto/issues/83).
UI:
* Added ability to inspect the full trace config string from the
'Info and stats' page.
* Fixed 'TABLE/VIEW XXX already exists' in the Metrics page when running the
same metric twice.
* Fixed sorting of tracks using numeric sorting instead of lexicographic:
Thread {1, 2, 10, 11, 20} rather than Thread {1, 10, 11, 2, 20}.
* Fixed CSP-related bug that was preventing the UI to work on Firefox.
* Changed max zoom resolution to allow to zoom to sub-us events.

Tracing service and probes:
* Added trace packet interceptor API for rerouting trace data into
non-Perfetto systems.
* Added support for printing track events to the console.
* Added a way to observe track event tracing sessions starting and
stopping.
Trace Processor:
* Added "ancestor_slice" and "experimental_ancestor_stack_profile_callsite"
table functions to look up ancestors of CPU stack samples in profiler
tables.
* Added power metric reporting suspend/resume time periods.
UI:
* Fixed CPU time calculation in example queries.
* Added tracks to debug Android SystemUI jank.

Tracing service and probes:
* Fixed crash of tracing service if a client is unresponsive on the IPC
channel. Clients are disconnected if they don't respond to IPCs for 10s.
* Added cmdline arguments for integration within ChromeOS system image
(--{producer,consumer}-socket-{group,mode} for chmod-ing sockets).
* Changed path lookup logic for traced socket. /run/perfetto/ is used if the
directory exists, falling back on /tmp/ otherwise.
* Added support for kernel frame symbolization to the traced_perf callstack
sampler.
* Added support for resolving ftrace event arguments that require
symbolization against printk_format.
Trace Processor:
* Added .read command to inject a SQL query file, similar to the -q cmdline.
* Added trace-based metrics to root cause jank in Android System UI.
* Added symbolization support for ELF files on Windows for heap and
callstack profilers.
* Added support for symbolizing names of workqueue ftrace events.
* Improved Android startup metric with activity restart time.
UI:
* Added support for navigating flows with Ctrl+[ / Ctr+].
* Improved query result panel, moved to the bottom group allowing
simultaneous query result and timeline views.
* Fixed data corruption when recording traces via the WebUSB-based Record
page in the UI.