Add AllowStartingServiceManagerOnly to about flags.

Bug: 899225
Change-Id: I3b8a74fadcd4ae1821654e4c37bdbf7985787e72
Reviewed-on: https://chromium-review.googlesource.com/c/1340780Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612726}

chrome/browser/about_flags.cc

@@ -3379,6 +3379,11 @@ const FeatureEntry kFeatureEntries[] = {
      flag_descriptions::kEnableNetworkServiceInProcessDescription, kOsAll,
      FEATURE_VALUE_TYPE(features::kNetworkServiceInProcess)},
 
+    {"allow-starting-service-manager-only",
+     flag_descriptions::kAllowStartingServiceManagerOnlyName,
+     flag_descriptions::kAllowStartingServiceManagerOnlyDescription, kOsAll,
+     FEATURE_VALUE_TYPE(features::kAllowStartingServiceManagerOnly)},
+
     {"out-of-blink-cors", flag_descriptions::kEnableOutOfBlinkCorsName,
      flag_descriptions::kEnableOutOfBlinkCorsDescription, kOsAll,
      FEATURE_VALUE_TYPE(network::features::kOutOfBlinkCors)},

chrome/browser/flag-metadata.json

@@ -86,6 +86,11 @@
     "owners": [ "pshmakov", "peter" ],
     "expiry_milestone": 74
   },
+  {
+    "name": "allow-starting-service-manager-only",
+    "owners": [ "hanxi", "hnakashima" ],
+    "expiry_milestone": 76
+  },
   {
     "name": "allow-sxg-certs-without-extension",
     // "owners": [ "your-team" ],

chrome/browser/flag_descriptions.cc

@@ -43,6 +43,12 @@ const char kAllowSignedHTTPExchangeCertsWithoutExtensionDescription[] =
     "#enable-signed-http-exchange. Warning: Enabling this may pose a security "
     "risk.";
 
+const char kAllowStartingServiceManagerOnlyName[] =
+    "Allow starting service manager only";
+const char kAllowStartingServiceManagerOnlyDescription[] =
+    "Allows running a lightweight service-manager-only mode, in which services "
+    "can run without the browser process.";
+
 const char kAndroidMessagesIntegrationName[] = "Android Messages integration";
 const char kAndroidMessagesIntegrationDescription[] =
     "Enables Chrome OS integration with Android messages.";

chrome/browser/flag_descriptions.h

@@ -53,6 +53,9 @@ extern const char kAllowNaclSocketApiDescription[];
 extern const char kAllowSignedHTTPExchangeCertsWithoutExtensionName[];
 extern const char kAllowSignedHTTPExchangeCertsWithoutExtensionDescription[];
 
+extern const char kAllowStartingServiceManagerOnlyName[];
+extern const char kAllowStartingServiceManagerOnlyDescription[];
+
 extern const char kAndroidMessagesIntegrationName[];
 extern const char kAndroidMessagesIntegrationDescription[];
 

tools/metrics/histograms/enums.xml

@@ -30720,6 +30720,7 @@ from previous Chrome versions.
   <int value="513356954" label="InstantTethering:disabled"/>
   <int value="513372959" label="ViewsProfileChooser:enabled"/>
   <int value="517568645" label="AnimatedAppMenuIcon:disabled"/>
+  <int value="530828403" label="AllowStartingServiceManagerOnly:disabled"/>
   <int value="533064367" label="WebRtcHideLocalIpsWithMdns:disabled"/>
   <int value="535131384" label="OmniboxTailSuggestions:enabled"/>
   <int value="535976218" label="enable-plugin-power-saver"/>
@@ -31578,6 +31579,7 @@ from previous Chrome versions.
   <int value="2005614493" label="tab-management-experiment-type-dill"/>
   <int value="2006413281"
       label="ContextualSuggestionsAlternateCardLayout:enabled"/>
+  <int value="2009362691" label="AllowStartingServiceManagerOnly:enabled"/>
   <int value="2014331873" label="NTPDownloadSuggestions:disabled"/>
   <int value="2014629801" label="view-passwords:disabled"/>
   <int value="2015335629" label="shelf-hover-previews"/>