Don't let proguard rename the CREATOR static of any Parcelable

base/android/base_proguard_config.flags

Index: base/android/base_proguard_config.flags
diff --git a/base/android/base_proguard_config.flags b/base/android/base_proguard_config.flags
index c01cc200f3be24fb7687beb9c37457f23d9904e9..e05cce3a0b68757e4a7b4fd5b3f90435c501a124 100644
--- a/base/android/base_proguard_config.flags
+++ b/base/android/base_proguard_config.flags
@@ -37,6 +37,11 @@
   native <methods>;
 }
 
+# Keep all Parcelables as they might be marshalled outside Chrome.
+-keepclassmembers class * implements android.os.Parcelable {
+  public static *** CREATOR;
+}
+
 # Remove methods annotated with this if their return value is unused
 -assumenosideeffects class ** {
   @org.chromium.base.annotations.RemovableInRelease <methods>;
@@ -57,3 +62,4 @@
 -keepclassmembers enum * {
     public static **[] values();
 }
+