Dump classifier in InputManager

Since we recently added a third input stage, we also need to learn about
its state in bugreports.

Dump the state in InputManager.

Test: adb shell dumpsys input
Bug: 117935272
Change-Id: I2de908fe82005eae6d5cdff3f809bb5d87af82ec

services/core/jni/com_android_server_input_InputManagerService.cpp

@@ -373,6 +373,9 @@ void NativeInputManager::dump(std::string& dump) {
     mInputManager->getReader()->dump(dump);
     dump += "\n";
 
+    mInputManager->getClassifier()->dump(dump);
+    dump += "\n";
+
     mInputManager->getDispatcher()->dump(dump);
     dump += "\n";
 }