Adding Finch and flag for Sign-in promo

ios/chrome/browser/resources/Settings.bundle/Experimental.plist

Index: ios/chrome/browser/resources/Settings.bundle/Experimental.plist
diff --git a/ios/chrome/browser/resources/Settings.bundle/Experimental.plist b/ios/chrome/browser/resources/Settings.bundle/Experimental.plist
index 21aaa2eca8c4665dc710c3392c62e35d5aeea75e..0eecc023226a79b9aa7726a4270e14ee17216bd7 100644
--- a/ios/chrome/browser/resources/Settings.bundle/Experimental.plist
+++ b/ios/chrome/browser/resources/Settings.bundle/Experimental.plist
@@ -276,28 +276,50 @@
 			<key>DefaultValue</key>
 			<false/>
 		</dict>
-                <dict>
-                        <key>Type</key>
-                        <string>PSMultiValueSpecifier</string>
-                        <key>Title</key>
-                        <string>Enable Suggestions UI</string>
-                        <key>Key</key>
-                        <string>EnableSuggestions</string>
-                        <key>DefaultValue</key>
-                        <string></string>
-                        <key>Values</key>
-                        <array>
-                                <string></string>
-                                <string>Enabled</string>
-                                <string>Disabled</string>
-                        </array>
-                        <key>Titles</key>
-                        <array>
-                                <string>Default</string>
-                                <string>Enabled</string>
-                                <string>Disabled</string>
-                        </array>
-                </dict>
+		<dict>
+			<key>Type</key>
+			<string>PSMultiValueSpecifier</string>
+			<key>Title</key>
+			<string>Enable Suggestions UI</string>
+			<key>Key</key>
+			<string>EnableSuggestions</string>
+			<key>DefaultValue</key>
+			<string></string>
+			<key>Values</key>
+			<array>
+				<string></string>
+				<string>Enabled</string>
+				<string>Disabled</string>
+			</array>
+			<key>Titles</key>
+			<array>
+				<string>Default</string>
+				<string>Enabled</string>
+				<string>Disabled</string>
+			</array>
+		</dict>
+		<dict>
+			<key>Type</key>
+			<string>PSMultiValueSpecifier</string>
+			<key>Title</key>
+			<string>Enable Signin Promo</string>
+			<key>Key</key>
+			<string>EnableSigninPromo</string>
+			<key>DefaultValue</key>
+			<string></string>
+			<key>Values</key>
+			<array>
+				<string></string>
+				<string>Enabled</string>
+				<string>Disabled</string>
+			</array>
+			<key>Titles</key>
+			<array>
+				<string>Default</string>
+				<string>Enabled</string>
+				<string>Disabled</string>
+			</array>
+		</dict>
 		<dict>
 			<key>Type</key>
 			<string>PSToggleSwitchSpecifier</string>