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

libs/input/PointerController.cpp

@@ -22,10 +22,17 @@
 #include <SkBlendMode.h>
 #include <SkCanvas.h>
 #include <SkColor.h>
+#include <android-base/stringprintf.h>
 #include <android-base/thread_annotations.h>
+#include <ftl/enum.h>
+
+#include <mutex>
 
 #include "PointerControllerContext.h"
 
+#define INDENT "  "
+#define INDENT2 "    "
+
 namespace android {
 
 namespace {
@@ -313,4 +320,12 @@ const ui::Transform& PointerController::getTransformForDisplayLocked(int display
     return it != di.end() ? it->transform : kIdentityTransform;
 }
 
+void PointerController::dump(std::string& dump) {
+    dump += INDENT "PointerController:\n";
+    std::scoped_lock lock(getLock());
+    dump += StringPrintf(INDENT2 "Presentation: %s\n",
+                         ftl::enum_string(mLocked.presentation).c_str());
+    dump += StringPrintf(INDENT2 "Pointer Display ID: %" PRIu32 "\n", mLocked.pointerDisplayId);
+}
+
 } // namespace android