Add speed operations and speed services overview docs.

docs/speed/chrome_speed_services.md

+# Speed Operations: Services
+
+TL: simonhatch@<br>
+Team: simonhatch@ benjhayden@, dtu@, eakuefner@<br>
+TPM: benhenry@<br>
+Mailing List: speed-services-dev@chromium.org<br>
+**[go/chrome-speed-services](https://goto.google.com/chrome-speed-services)**
+
+## Mission
+The mission of the Chrome Speed Services team is to develop the tools and
+infrastructure necessary for teams to detect, help diagnose, and follow through
+on performance regressions in Chrome. We accomplish this through a set of
+interconnected tools, which process data from the Chrome Benchmarking Team and
+automate the Chrome Speed Releasing workflow:
+ 
+  * The [Chrome Performance Dashboard](https://chromeperf.appspot.com) stores
+    over 4 million performance timeseries, and monitors hundreds of thousands
+    of them for performance regressions. It integrates with Chrome's bug
+    tracker for follow-through.
+  * Most of our automated builds take too long to get performance data on every
+    revision, so we have [bisect bots](bisects.md) to narrow down regressions.
+    These bots also support running performance try jobs on unsubmitted CLs.
+  * Whether a performance test is run locally or in the lab, right now or last
+    year, we want to make it easy to understand and share the results. We
+    develop [data formats](https://github.com/catapult-project/catapult/blob/master/docs/histogram-set-json-format.md)
+    and user interfaces that make it easy to dig deeply into performance
+    regressions.
+ 
+Here is a diagram of how our tooling fits into the chromium performance
+continuous build:
+![Speed Continuous Build](images/speed_services.png)
+
+
+## 2017 Roadmap
+  * **Improve our ability to bisect to root causes**.
+    [Pinpoint](https://docs.google.com/document/d/1FKPRNU2kbPJ15p6XHO0itCjYtfvCpGt2IHblriTX1tg/edit)
+    is a rewrite of the existing bisect system, design to address the
+    shortcomings of a fully automated system running on buildbot. Tighter
+    integration with the dashboard will allow better code sharing, more
+    thorough test coverage, and a greatly improved and interactive user
+    interface.
+  * **Enable deep debugging and better numerics across our products.**
+    We are working to make the dashboard, pinpoint, and telemetry all use our new
+    [HistogramSet](https://github.com/catapult-project/catapult/blob/master/docs/histogram-set-json-format.md)
+    data format, which stores full histograms and statistics about test
+    results, as well as diagnostics with built-in UIs which help users dig in
+    when something's wrong.
+  * **Improve the sheriffing process.** We're working on burning down bugs in
+    the sheriffing workflow, and also adding
+    [milestone-level reports](https://docs.google.com/document/d/1MgTs2TBEHcKqgil_zqy72GlZr_74udyDKznTZixhrrI/edit)
+    that give a high-level overview of how Chrome is performing from release to
+    release, so that we can better focus our performance efforts.