As we track document.registerElement, so should we track customElements.define to get an idea of custom element use.
Patch up at https://codereview.chromium.org/2490083002
The following revision refers to this bug: https://chromium.googlesource.com/chromium/src.git/+/cc55b22c21045a945d284f20373f973aa5aebb2b commit cc55b22c21045a945d284f20373f973aa5aebb2b Author: dominicc <dominicc@chromium.org> Date: Thu Nov 17 08:15:47 2016 Add a use counter to customElements.define. BUG= 664001 Review-Url: https://codereview.chromium.org/2490083002 Cr-Commit-Position: refs/heads/master@{#432806} [modify] https://crrev.com/cc55b22c21045a945d284f20373f973aa5aebb2b/third_party/WebKit/Source/core/dom/custom/CustomElementRegistry.idl [modify] https://crrev.com/cc55b22c21045a945d284f20373f973aa5aebb2b/third_party/WebKit/Source/core/frame/UseCounter.h [modify] https://crrev.com/cc55b22c21045a945d284f20373f973aa5aebb2b/tools/metrics/histograms/histograms.xml
Comment 1 by dominicc@chromium.org
, Nov 10 2016