[Signin] Update sign in promo triggering logic

chrome/android/java/ChromeVersionConstants.java.version

Index: chrome/android/java/ChromeVersionConstants.java.version
diff --git a/chrome/android/java/ChromeVersionConstants.java.version b/chrome/android/java/ChromeVersionConstants.java.version
index 81e981e066dae9c48d2caf3cbe7160c31f2d7e68..7199126f3aa40770d3f8a3a73975772e65b76c73 100644
--- a/chrome/android/java/ChromeVersionConstants.java.version
+++ b/chrome/android/java/ChromeVersionConstants.java.version
@@ -9,6 +9,8 @@ class ChromeVersionConstants {
     static final String PRODUCT_VERSION = "@MAJOR@.@MINOR@.@BUILD@.@PATCH@";
     static final boolean IS_OFFICIAL_BUILD = @OFFICIAL_BUILD@ == 1;
 
+    static final int PRODUCT_MAJOR_VERSION = @MAJOR@;
+
     static final int CHANNEL_DEFAULT = 0;
     static final int CHANNEL_CANARY = 1;
     static final int CHANNEL_DEV = 2;