[Android] Check for Java object types covariance in Java Bridge

content/common/android/gin_java_bridge_errors.cc

Index: content/common/android/gin_java_bridge_errors.cc
diff --git a/content/common/android/gin_java_bridge_errors.cc b/content/common/android/gin_java_bridge_errors.cc
index 7a80801510266a1706e6306b16249fb3f1628c52..57326b38725c3ec864323453250f70300f379d14 100644
--- a/content/common/android/gin_java_bridge_errors.cc
+++ b/content/common/android/gin_java_bridge_errors.cc
@@ -22,6 +22,9 @@ const char* GinJavaBridgeErrorToString(GinJavaBridgeError error) {
       return "Access to java.lang.Object.getClass is blocked";
     case kGinJavaBridgeJavaExceptionRaised:
       return "Java exception was raised during method invocation";
+    case kGinJavaBridgeNonAssignableTypes:
+      return "The type of the object passed to the method is incompatible "
+          "with the type of method's argument";
   }
   NOTREACHED();
   return "Unknown error";