Import hr-time and user-timing tests, remove redundant webperf copies

LayoutTests/http/tests/w3c/README

Index: LayoutTests/http/tests/w3c/README
diff --git a/LayoutTests/http/tests/w3c/README b/LayoutTests/http/tests/w3c/README
index 3a76b090cfad86fbd3424a072d86459ae6578c3c..197f24c1dbbcb997900e8902e2a3033b1667147c 100644
--- a/LayoutTests/http/tests/w3c/README
+++ b/LayoutTests/http/tests/w3c/README
@@ -1,5 +1,32 @@
 This directory contains files imported from the W3C.
 
+== THIS DIRECTORY IS OBSOLETE ==
+
+Tests are now imported into LayoutTests/imported (see README there).
+
+The tests in LayoutTests/http/tests/w3c/webperf were imported from
+https://dvcs.w3.org/hg/webperf/ but have been migrated into the
+https://github.com/w3c/web-platform-tests repo:
+
+* HighResolutionTime -> hr-time/
+* navigation-timing -> navigation-timing/
+* resource-timing -> resource-timing/
+* UserTiming -> user-timing/
+
+This directory now contains:
+
+* Submissions that were not "approved" - these should be reviewed
+  for redundancy with approved tests in web-platform-tests
+
+* Tests that require a http/s server. Tracked as:
+  http://crbug.com/360762
+
+Please do not add additional tests to this directory, and strive
+to remove them. Removing this directory is tracked as:
+http://crbug.com/498037
+
+== Previous Documentation ==
+
 With only one exception (below), these files should not be modified directly. Instead, please
 source the files from the following locations: