Adding option for Proguard jar to be switched.

base/android/java/templates/BuildConfig.template

Index: base/android/java/templates/BuildConfig.template
diff --git a/base/android/java/templates/BuildConfig.template b/base/android/java/templates/BuildConfig.template
index 9a678cc848485304664364a304852c05356e8bf5..f2259c67fd5f924391bcd2c174d296700cecac7a 100644
--- a/base/android/java/templates/BuildConfig.template
+++ b/base/android/java/templates/BuildConfig.template
@@ -23,10 +23,10 @@ public class BuildConfig {
     }
 
     // Debug does not change between targets, can be final and optimized out.
-#if defined(NDEBUG)
-    public static final boolean sIsDebug = true;
+#if defined(DEBUG)
+    public static final boolean IS_DEBUG = true;
 #else
-    public static final boolean sIsDebug = false;
+    public static final boolean IS_DEBUG = false;
 #endif
 
 }