Add origin_trial_feature_name for MeasureMemory

Bug: 1049093
Change-Id: I830afdbcd712e892053edd263170d67996be40a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2095306Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748606}

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -973,6 +973,7 @@
     },
     {
       name:"MeasureMemory",
+      origin_trial_feature_name: "MeasureMemory",
       status:"experimental",
     },
     {