Initial CL for Data Saver (Flywheel) prompt when cellular network detected

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index ad25f94f100da7e064a1a05e38671da5c4604d9d..1e64b8341cf386845831d6d352ba2b03b02ad057 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -425,6 +425,19 @@ const Experiment::Choice kAshScreenRotationAnimationChoices[] = {
 };
 #endif
 
+#if defined(OS_CHROMEOS)
+const Experiment::Choice kDataSaverPromptChoices[] = {
+  { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
+  { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
+    chromeos::switches::kDisableDataSaverPrompt, "" },
+  { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
+    chromeos::switches::kEnableDataSaverPrompt, "" },
+  { IDS_FLAGS_DATASAVER_PROMPT_DEMO_MODE,
+    chromeos::switches::kEnableDataSaverPrompt,
+    chromeos::switches::kDataSaverPromptDemoMode },
+};
+#endif
+
 // RECORDING USER METRICS FOR FLAGS:
 // -----------------------------------------------------------------------------
 // The first line of the experiment is the internal name. If you'd like to
@@ -2319,6 +2332,15 @@ const Experiment kExperiments[] = {
     SINGLE_VALUE_TYPE(chromeos::switches::kEnableMtpWriteSupport)
   },
 #endif  // defined(OS_CHROMEOS)
+#if defined(OS_CHROMEOS)
+  {
+    "enable-datasaver-prompt",
+    IDS_FLAGS_DATASAVER_PROMPT_NAME,
+    IDS_FLAGS_DATASAVER_PROMPT_DESCRIPTION,
+    kOsCrOS,
+    MULTI_VALUE_TYPE(kDataSaverPromptChoices)
+  },
+#endif  // defined(OS_CHROMEOS)
   // NOTE: Adding new command-line switches requires adding corresponding
   // entries to enum "LoginCustomFlags" in histograms.xml. See note in
   // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.