Add code of conduct to project.

CODE_OF_CONDUCT.md

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+# Chromium Code of Conduct
+
+Google and the Chromium team are committed to preserving and fostering a
+diverse, welcoming community. Below is our community code of conduct, which
+applies to our repos and organizations, issue trackers, mailing lists,
+blog content, and any other Chromium-supported communication group, as
+well as any private communication initiated in the context of these
+spaces. This code of conduct must be followed by everyone contributing to
+the Chromium project, regardless of affiliation or position.
+
+Simply put, community discussions should be
+
+ * respectful and kind;
+ * about Chromium;
+ * about features and code, not the individuals involved.
+
+## Be respectful and constructive.
+
+Treat everyone with respect. Build on each other's ideas. Each of us has the
+right to enjoy our experience and participate without fear of harassment,
+discrimination, or condescension, whether blatant or subtle. Remember that
+Chromium is a geographically distributed team and that you may not be
+communicating with someone in their primary language. We all get frustrated
+when working on hard problems, but we cannot allow that frustration to turn
+into personal attacks.
+
+## Speak up if you see or hear something.
+
+You are empowered to politely engage when you feel that you or others are
+disrespected. The person making you feel uncomfortable may not be aware of what
+they are doing - politely bringing their behavior to their attention is
+encouraged.
+
+If you are uncomfortable speaking up, or feel that your concerns are not being
+duly considered, you can email community@chromium.org, dpranke@chromium.org, or
+groby@chromium.org to request involvement from a community manager. All
+concerns shared with community managers will be kept confidential, but you may
+also submit an anonymous report [here](https://docs.google.com/a/google.com/forms/d/e/1FAIpQLSe-LDjW9eIJ-TpI2poZxnGtU-SvUWkFZc8x0aiKGY1s7NKPdA/viewform?c=0&w=1).
+Please note that without a way to contact you, an anonymous report may be
+difficult to act on. You may also create a throwaway account to report. In
+cases where a public response is deemed necessary, the identities of victims
+and reporters will remain confidential unless those individuals instruct us
+otherwise.
+
+While all reports will be taken seriously, the Chromium community managers may
+not act on complaints that they feel are not violations of this code of
+conduct.
+
+## We will not tolerate harassment of any kind, including but not limited to:
+
+ * Harassing comments
+ * Intimidation
+ * Encouraging a person to engage in self-harm.
+ * Sustained disruption or derailing of threads, channels, lists, etc.
+ * Offensive or violent comments, jokes or otherwise
+ * Inappropriate sexual content
+ * Unwelcome sexual or otherwise aggressive attention
+ * Continued one-on-one communication after requests to cease
+ * Distribution or threat of distribution of people's personally identifying
+   information, AKA “doxing”
+
+## Consequences for failing to comply with this policy
+
+Consequences for failing to comply with this policy may include, at the sole
+discretion of the Chromium community managers:
+
+ * a request for an apology;
+ * a private or public warning or reprimand;
+ * a temporary ban from the mailing list, blog, Chromium repository or
+   organization, or other Chromium-supported communication group, including
+   loss of committer status;
+ * a permanent ban from any of the above, or from all current and future
+   Chromium-supported or Google-supported communities, including loss of
+   committer status.
+
+Participants warned to stop any harassing behavior are expected to comply
+immediately; failure to do so will result in an escalation of consequences.
+
+## Acknowledgements
+
+This Code of Conduct is based on the Geek Feminism Code of Conduct, the Django
+Code of Conduct and the Geek Feminism Wiki "Effective codes of conduct" guide.
+
+## License
+
+This Code of Conduct is available for reuse under the Creative Commons Zero
+(CC0) license.