Disable AutoImport: experiment and histogram for analysis.

chrome/common/chrome_features.cc

Index: chrome/common/chrome_features.cc
diff --git a/chrome/common/chrome_features.cc b/chrome/common/chrome_features.cc
index fcbe47e20dccdb6bf5ebee40404a701e82227ace..464c1e89bdc087b2780abb4fc00a44bf0466506f 100644
--- a/chrome/common/chrome_features.cc
+++ b/chrome/common/chrome_features.cc
@@ -48,6 +48,12 @@ const base::Feature kBlockSmallContent{"BlockSmallPluginContent",
 const base::Feature kBrowserHangFixesExperiment{
     "BrowserHangFixesExperiment", base::FEATURE_DISABLED_BY_DEFAULT};
 
+#if defined(OS_WIN)
+// Disables the AutoImport feature on first run. See crbug.com/555550
+const base::Feature kDisableFirstRunAutoImport{
+    "DisableFirstRunAutoImport", base::FEATURE_DISABLED_BY_DEFAULT};
+#endif
+
 // Enables Expect CT reporting, which sends reports for opted-in sites
 // that don't serve sufficient Certificate Transparency information.
 const base::Feature kExpectCTReporting{"ExpectCTReporting",