Add UMA metric to track usage of sending a mousedown to select elements.

third_party/WebKit/LayoutTests/imported/wpt/annotation-protocol/CONTRIBUTING.md

Index: third_party/WebKit/LayoutTests/imported/wpt/annotation-protocol/CONTRIBUTING.md
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+Annotation-Protocol: Guidelines for Contributing Tests
+======================================================
+
+This document describes the method people should use for authoring tests and
+integrating them into the repository.  Anyone is welcome to submit new tests to
+this collection.  If you do, please create the tests following the guidelines
+below.  Then submit them as a pull request so they can be evaluated
+
+Structure
+---------
+
+Tests are organized by client or server, and then by major section of the Annotation
+Protocol specification.  The folders associated with these are:
+
+* client - tests a client needs to run
+* server - tests to be run against a server
+
+Within these folders, special files ending with the suffix ".html" provide the source
+for the test as a set javascript calls to perform the test.
+
+* scripts - JavaScript that are included by tests
+* tools - supporting scripts and files
+
+Client Test Cases
+-----------------
+
+@@@TODO@@@ describe the structure of client test cases.
+
+Server Test Cases
+-----------------
+
+@@@TODO@@@ describe the structure of server test cases.
+
+
+Command Line Tools
+------------------
+
+### Stand-alone Annotation Server ###