[Sanitizer API] Make Sanitizer available via chrome://flags.

Also, upgrade the Blink runtime feature to 'experimental'.

Bug: 1172254
Change-Id: I471207d0529194182191d713750af57614369997
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2772418
Commit-Queue: Daniel Vogelheim <[email protected]>
Reviewed-by: Mike West <[email protected]>
Cr-Commit-Position: refs/heads/master@{#868532}
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index 09336868..d3e18da 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -2681,6 +2681,10 @@
     "experimental web platform features to be enabled.";
 const char kDrawPredictedPointsName[] = "Draw predicted delegated ink points";
 
+const char kSanitizerApiName[] = "Sanitizer API";
+const char kSanitizerApiDescription[] =
+    "Enable the Sanitizer API. See: https://github.com/WICG/sanitizer-api";
+
 // Android ---------------------------------------------------------------------
 
 #if defined(OS_ANDROID)