refs #1700 performance tracking in piwik.js

 * by default, send performance.timing.responseEnd - performance.timing.requestStart as generation time with the tracking request
 * if the performance.timing API is not supported by the browser, don't send the metric
 * new method disablePerformanceTracking()
 * new method setGenerationTimeMs(generationTime) to set the generation after measuring it on the server side 

1 files changed, 18 insertions, 18 deletions

diff --git a/piwik.js b/piwik.js
index afe0e755ae..075c1c3e49 100644
--- a/piwik.js
+++ b/piwik.js
@@ -10,21 +10,21 @@
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