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

LayoutTests/FlakyTests

Index: LayoutTests/FlakyTests
diff --git a/LayoutTests/FlakyTests b/LayoutTests/FlakyTests
index ff7d346a37dd94a73b43776cf1ddc9a154f92003..43166f7b54256b330120c71f435f8f0ce473e6f6 100644
--- a/LayoutTests/FlakyTests
+++ b/LayoutTests/FlakyTests
@@ -855,12 +855,6 @@ crbug.com/401377 [ Release XP ] http/tests/serviceworker/fetch-mixed-content-to-
 Bug(gardener) [ Release Win7 ] http/tests/serviceworker/fetch-mixed-content-to-outscope.html [ Pass Timeout ]
 Bug(gardener) [ Release Retina ] http/tests/serviceworker/onactivate-script-error.html [ Crash Pass ]
 Bug(gardener) [ Release Win7 ] http/tests/serviceworker/registration.html [ Pass Timeout ]
-Bug(gardener) [ Release Win7 ] http/tests/w3c/webperf/approved/UserTiming/test_user_timing_mark.htm [ Failure Pass ]
-Bug(gardener) [ Release XP ] http/tests/w3c/webperf/approved/UserTiming/test_user_timing_mark.htm [ Failure Pass ]
-Bug(gardener) [ Release Win7 ] http/tests/w3c/webperf/approved/UserTiming/test_user_timing_measure.htm [ Failure Pass ]
-Bug(gardener) [ Release XP ] http/tests/w3c/webperf/approved/UserTiming/test_user_timing_measure.htm [ Failure Pass ]
-crbug.com/395127 [ Release Win7 ] http/tests/w3c/webperf/approved/UserTiming/test_user_timing_measure_navigation_timing.htm [ Failure Pass ]
-crbug.com/395127 [ Release XP ] http/tests/w3c/webperf/approved/UserTiming/test_user_timing_measure_navigation_timing.htm [ Failure Pass ]
 Bug(gardener) [ Release MountainLion ] http/tests/w3c/webperf/approved/navigation-timing/html/test_document_open.html [ Crash Pass ]
 Bug(gardener) [ Debug Win7 ] http/tests/w3c/webperf/submission/Google/resource-timing/html/test_resource_connection_reuse.html [ Failure Pass ]
 Bug(gardener) [ Release Mavericks ] http/tests/w3c/webperf/submission/Intel/resource-timing/test_resource_timing_buffer_size_restriction.html [ Failure Pass ]