Add more debugging for ClassCastException when loading modules

This also prints the parent ClassLoaders, to see if there is differences
there too.

Bug: 1142589
Change-Id: Ib8933bba6ce6bc66883a2bc88bee208383e41dcb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2514591
Auto-Submit: Clark DuVall <cduvall@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823396}

components/module_installer/android/java/src/org/chromium/components/module_installer/builder/Module.java

@@ -117,8 +117,14 @@ public class Module<T> {
                 ClassLoader implClassLoader = impl.getClass().getClassLoader();
                 throw new RuntimeException("Failure casting " + mName
                                 + " module class, interface ClassLoader: " + interfaceClassLoader
-                                + ", impl ClassLoader: " + implClassLoader
-                                + ", equal: " + interfaceClassLoader.equals(implClassLoader),
+                                + " (parent " + interfaceClassLoader.getParent() + ")"
+                                + ", impl ClassLoader: " + implClassLoader + " (parent "
+                                + implClassLoader.getParent() + ")"
+                                + ", equal: " + interfaceClassLoader.equals(implClassLoader)
+                                + " (parents equal: "
+                                + interfaceClassLoader.getParent().equals(
+                                        implClassLoader.getParent())
+                                + ")",
                         e);
             }
             return mImpl;