Perfetto

Tracing service and probes:
* Added ftrace clock reporting to the trace.
Trace Processor:
* Added support for longs/doubles to RUN_METRIC.
* Added power profile data for sunfish, redfin, and bramble.
* Added experimental Python library for computing slice breakdowns.
* Fixed parsing of JSON escape sequences.
* Fixed JSON trace detection.
UI:
* Added local cacheing of traces. Traces are reloaded in case of refresh or
tab being discarded by the browser.
* Added icon to distinguish metric-derived tracks.
* Added release channel selector to feature flags page.
* Fixed crash with null slice names.
SDK:
* Added some missing NESTABLE_ASYNC legacy trace macros.
* Fixed reporting of producer uid in --query.
* Fixed version numbering scheme for minor versions. Previously versions
were numbered as like v19.0.42 where 42 represented the number of commits
since the last major version release. This was ambiguous in the presence
of branches. Now versions are numbered like v19.0-ab12cd34 where ab12cd34
is the shortened Git commit-ish.

Tracing service and probes:
* Added cross-compiler toolchains for Linux-{arm,64} based on Debian Sid.
These will be used for generating monthly releases' prebuilts via LUCI.
Trace Processor:
* Added 'android_gpu' metric to report residency information for each GPU
frequency (via `trace_processor_shell --run-metrics android_gpu`).
* Removed the RawQuery RPC interface.
UI:
* Added a highlighted section to thread slices to visualize CPU time
(darker) verses wall time (lighter).
* Added global counter tracks for perf counters (e.g. "CPU 0 cycles", "CPU 0
instructions") when the 'linux.perf' data source (traced_perf) is used.
* Added a (feature) 'Flags' page to enable/disable individual metrics.
* Fixed races that could cause occasional crashes when loading a trace
from a permalink.
SDK:
* Fix undefined reference on ~TracingMuxerFake when building the SDK.

Tracing service and probes:
* Fixed a bug in ftrace parsing of absolute timestamps
(RINGBUF_TYPE_TIME_STAMP), encountered on Linux kernels 5.9+.
* Fixed a bug in --save-for-bugreport causing 0-length traces if the
selected trace declared one or more triggers in the config.
* Fixed a bug in tracebox causing the PERFETTO_PRODUCER_SOCK_NAME env
var to be ignored.
Trace Processor:
* Changed CORS headers of --httpd mode to allow only https://ui.perfetto.dev
and http://localhost:10000. This affects only CORS-aware browser clients.
* Added GPU frequency metrics.
UI:
* Fixed ADB connection issues ("unable to reset device") on Windows and Mac.
* Added caching of tracing in the cache storage so that the trace is
re-opened if a tab is killed (Chrome tab discarding or accidental CTRL+W).
SDK:
* Added support for writing track events using custom clock timestamps.

Tracing service and probes:
* Cherry-pick of r.android.com/1716718 which missed the v16 branch cut and
fixed MSVC 2019 builds.

Tracing service and probes:
* Added support for building most targets (including traced, SDK and
trace_processor_shell) from Windows using either clang-cl or MSVC 2019.
* Added tracebox, a monolithic binary to capture traces with one command
on Linux and older versions of Android (tested on Android Oreo).
* Added support for service-side field-level filtering of traces. The
consumer can pass a filter bytecode and ensure that non-allowed fields
are never emitted in output.
* Added reporting of service version and producer SDK version into the trace
and `perfetto --query`.
* Fixed compatibility with Android versions older than Pie (for sideloading)
which cause failures when trying to enable atrace categories.
Trace Processor:
* Added new RPC interface based on a bidirectional binary pipe. This allows
to simplify integration with out-of-process users. The existing --httpd
interface now exposes a single /rpc endpoint. Older endpoints are still
available for legacy clients.
* Added support for counters and instant events in JSON traces.
* Fixed support of displayTimeUnit in JSON traces.
UI:
* Added warning dialog when trying to use a trace_processor_shell --httpd
which is too old.
* Added warning dialog when trying to use a trace_processor_shell --httpd
RPC instance from more than one tab.
* Added links to convert the trace to JSON or systrace directly from the UI.
* Changed track sorting logic. Tracks are now sorted in groups (e.g.,
scheduling tracks, summary tracks, frame timeline tracks).
* Fixed crashes happening flakily when pushing traces via window.open().

Tracing service and probes:
* Added support for {host,target}=aarch64 standalone builds.
* Added --background cmdline switch to traced and traced_probes services.
* Changed trigger_perfetto to ignore unknown command line arguments to
preserve forward compatibility.
* Added -a / --app cmdline argument to tools/record_android_trace.
Trace Processor:
* Added sanitisation of keys in nested debug annotation dictionaries.
* Changed Android startup metric: count CPU time of JIT thread pool, report
timestamp of activities during startup.
* Changed android_surfaceflinger metric, added missed frame counters.
* Changed version of SQLite to 3.35.4.
* Fixed importing of JSON traces with decimal (sub-us) timestamp.
* Fixed prepending "debug." prefix to debug annotations with non-interned
names.
UI:
* Added support to visualize the lifetime of individual dmabuf allocations
as async slices (datasource: already existing ftrace dmabuf event).
* Fixed visualization of unfinished slices to extend to the end of the
viewport.
SDK:
* Added support for passing arbitrary number of debug annotations to
TRACE_EVENT and combining them with lambdas.
* Added support for writing typed TrackEvent arguments using TRACE_EVENT
inline without lambdas.
* Changed ConvertTimestampToTraceTimeNs to be a member of
TraceTimestampTraits<T> struct instead of a standalone function.
* Changed TracedValue to use nested DebugAnnotation proto instead of
DebugAnnotation::NestedValue.