Add chrome://flag control for features::kBrowserTouchBar

tools/metrics/histograms/enums.xml

Index: tools/metrics/histograms/enums.xml
diff --git a/tools/metrics/histograms/enums.xml b/tools/metrics/histograms/enums.xml
index 7ce265855746d3f574b33ade4d25635719e2b2da..6bfd852892193276dfd7d116535669a4a3191b56 100644
--- a/tools/metrics/histograms/enums.xml
+++ b/tools/metrics/histograms/enums.xml
@@ -21920,6 +21920,17 @@ uploading your change for review.  These are checked by presubmit scripts.
 </enum>
 
 <enum name="LoginCustomFlags" type="int">
+<!--
+Values in LoginCustomFlags are:  value=(uint32_t)MD5(label).
+This enum is verified by AboutFlagsHistogramTest unit test.
+To add a new entry, add it with any unique value and run test to compute valid
+value. After that run tools/metrics/histograms/validate_format.py to find out
+where the value should be inserted to maintain ordering.
+Don't remove entries when removing a flag, they are still used to decode data
+from previous Chrome versions.
+-->
+
+  <summary>Chrome flags that lead to chrome restart on ChromeOS.</summary>
   <int value="-2146613579" label="V8Future:disabled"/>
   <int value="-2143961262" label="D3DVsync:disabled"/>
   <int value="-2143328006"
@@ -22181,6 +22192,7 @@ uploading your change for review.  These are checked by presubmit scripts.
   <int value="-1344375439" label="ServiceWorkerPaymentApps:disabled"/>
   <int value="-1341092934" label="enable-accelerated-overflow-scroll"/>
   <int value="-1340055960" label="enable-streamlined-hosted-apps"/>
+  <int value="-1338306372" label="BrowserTouchBar:enabled"/>
   <int value="-1337185440" label="enable-webvr"/>
   <int value="-1334327410" label="ash-enable-touch-view-testing"/>
   <int value="-1327676774" label="disable-accelerated-mjpeg-decode"/>
@@ -22206,17 +22218,6 @@ uploading your change for review.  These are checked by presubmit scripts.
   <int value="-1212273428" label="enable-experimental-app-list"/>
   <int value="-1212167260" label="disable-app-window-cycling"/>
   <int value="-1208501269" label="AutofillScanThemeDialog:enabled"/>
-<!--
-Values in LoginCustomFlags are:  value=(uint32_t)MD5(label).
-This enum is verified by AboutFlagsHistogramTest unit test.
-To add a new entry, add it with any unique value and run test to compute valid
-value. After that run tools/metrics/histograms/validate_format.py to find out
-where the value should be inserted to maintain ordering.
-Don't remove entries when removing a flag, they are still used to decode data
-from previous Chrome versions.
--->
-
-  <summary>Chrome flags that lead to chrome restart on ChromeOS.</summary>
   <int value="-1206337150"
       label="OmniboxUIExperimentHideSuggestionUrlScheme:disabled"/>
   <int value="-1203955801" label="enable-password-change-support:disabled"/>
@@ -22609,6 +22610,7 @@ from previous Chrome versions.
   <int value="201343576" label="enable-password-change-support:enabled"/>
   <int value="203776499" label="enable-virtual-keyboard-overscroll"/>
   <int value="223662457" label="BackgroundLoadingForDownloads:enabled"/>
+  <int value="241187301" label="BrowserTouchBar:disabled"/>
   <int value="244697230" label="enable-theme-color-in-tabbed-mode"/>
   <int value="259021228" label="OffMainThreadFetch:disabled"/>
   <int value="262382944" label="GuestViewCrossProcessFrames:disabled"/>