Introduce Diagnostics app feature flag

Bug: 1120206
Change-Id: I33cf4b17eac6f527877d82fcf31e8b39770d0ef2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368102
Commit-Queue: Jimmy Gong <[email protected]>
Reviewed-by: Bailey Berro <[email protected]>
Cr-Commit-Position: refs/heads/master@{#801212}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 25fe29e..fa90cde8 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -5214,6 +5214,10 @@
     {"print-save-to-drive", flag_descriptions::kPrintSaveToDriveName,
      flag_descriptions::kPrintSaveToDriveDescription, kOsCrOS,
      FEATURE_VALUE_TYPE(chromeos::features::kPrintSaveToDrive)},
+
+    {"diagnostics-app", flag_descriptions::kDiagnosticsAppName,
+     flag_descriptions::kDiagnosticsAppDescription, kOsCrOS,
+     FEATURE_VALUE_TYPE(chromeos::features::kDiagnosticsApp)},
 #endif  // OS_CHROMEOS
 
     {"autofill-off-no-server-data",