[devtools] Log drawers with correct telemetry codes.

This adds a bunch of missing values to the "DevToolsPanel" enum, as
otherwise all these drawers get logged with the code 0 instead, which
makes it impossible to distinguish.

Bug: chromium:993562
Change-Id: Icdb11f6c35fe8f521e141c487c6a0b483fa4ee3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1805663
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697206}

third_party/blink/renderer/devtools/front_end/host/UserMetrics.js

@@ -157,6 +157,16 @@ Host.UserMetrics._PanelCodes = {
   security: 16,
   js_profiler: 17,
   audits: 18,
+  'drawer-coverage': 19,
+  'drawer-protocol-monitor': 20,
+  'drawer-remote-devices': 21,
+  'drawer-web-audio': 22,
+  'drawer-changes.changes': 23,
+  'drawer-performance.monitor': 24,
+  'drawer-release-note': 25,
+  'drawer-live_heap_profile': 26,
+  'drawer-sources.quick': 27,
+  'drawer-network.blocked-urls': 28,
 };
 
 /** @type {!Host.UserMetrics} */

third_party/blink/web_tests/http/tests/devtools/user-metrics-expected.txt

@@ -44,11 +44,21 @@ recordPanelShown:
     audits : 18
     console : 8
     drawer-animations : 11
+    drawer-changes.changes : 23
     drawer-console-view : 10
+    drawer-coverage : 19
+    drawer-live_heap_profile : 26
+    drawer-network.blocked-urls : 28
     drawer-network.config : 12
+    drawer-performance.monitor : 24
+    drawer-protocol-monitor : 20
+    drawer-release-note : 25
+    drawer-remote-devices : 21
     drawer-rendering : 13
     drawer-sensors : 14
+    drawer-sources.quick : 27
     drawer-sources.search : 15
+    drawer-web-audio : 22
     elements : 1
     heap_profiler : 6
     js_profiler : 17

tools/metrics/histograms/enums.xml

@@ -13483,6 +13483,16 @@ Called by update_net_error_codes.py.-->
   <int value="16" label="Security"/>
   <int value="17" label="JavaScript Profiler"/>
   <int value="18" label="Audits"/>
+  <int value="19" label="Drawer - Coverage"/>
+  <int value="20" label="Drawer - Protocol monitor"/>
+  <int value="21" label="Drawer - Remote devices"/>
+  <int value="22" label="Drawer - WebAudio"/>
+  <int value="23" label="Drawer - Changes"/>
+  <int value="24" label="Drawer - Performance monitor"/>
+  <int value="25" label="Drawer - What's New"/>
+  <int value="26" label="Drawer - Live Heap Profile"/>
+  <int value="27" label="Drawer - Quick source"/>
+  <int value="28" label="Drawer - Request blocking"/>
 </enum>
 
 <enum name="DevToolsSetting">