Second reland "Let InputFlinger create the server InputChannel"

Bug: 167947395
Bug: 169173706
Test: atest NexusLauncherTests:com.android.launcher3.ui.TaplTestsLauncher3
Change-Id: I9cbe8ce92d006abfe9246f88844730951caf940b
diff --git a/libs/input/android/os/IInputFlinger.aidl b/libs/input/android/os/IInputFlinger.aidl
index 0cdf0bb..1771d19 100644
--- a/libs/input/android/os/IInputFlinger.aidl
+++ b/libs/input/android/os/IInputFlinger.aidl
@@ -30,8 +30,8 @@
     // shouldn't be a concern.
     oneway void setInputWindows(in InputWindowInfo[] inputHandles,
             in @nullable ISetInputWindowsListener setInputWindowsListener);
-    void registerInputChannel(in InputChannel channel);
-    void unregisterInputChannel(in IBinder connectionToken);
+    InputChannel createInputChannel(in @utf8InCpp String name);
+    void removeInputChannel(in IBinder connectionToken);
     /**
      * Sets focus to the window identified by the token. This must be called
      * after updating any input window handles.