Add dump for PointerController.

Just a simple dump to start, but start pushing more PointerController
information into bugreports.

Bug: 254277939
Test: manually inspect `dumpsys input`
Change-Id: I7ca637aa8a8f1cc1188eddcf694f7c4aea7d5821
diff --git a/libs/input/PointerController.h b/libs/input/PointerController.h
index 33480e8..48d5a57 100644
--- a/libs/input/PointerController.h
+++ b/libs/input/PointerController.h
@@ -27,6 +27,7 @@
 
 #include <map>
 #include <memory>
+#include <string>
 #include <vector>
 
 #include "MouseCursorController.h"
@@ -75,6 +76,8 @@
     void onDisplayInfosChangedLocked(const std::vector<gui::DisplayInfo>& displayInfos)
             REQUIRES(getLock());
 
+    void dump(std::string& dump);
+
 protected:
     using WindowListenerConsumer =
             std::function<void(const sp<android::gui::WindowInfosListener>&)>;