Fix drag and drop (2/3)

Handle InputWindowCommands in SurfaceFlinger. Send transferTouchFocus from
SurfaceFlinger to InputFlinger.

Test: InputSurfacesTest.transfer_touch_focus
Bug: 120463595
Change-Id: I6592cc9ee4a77700ea191fd1ca337b91895b61fe
diff --git a/services/inputflinger/InputManager.h b/services/inputflinger/InputManager.h
index 8f7551e..ab309b1 100644
--- a/services/inputflinger/InputManager.h
+++ b/services/inputflinger/InputManager.h
@@ -91,6 +91,7 @@
     virtual sp<InputDispatcherInterface> getDispatcher();
 
     virtual void setInputWindows(const Vector<InputWindowInfo>& handles);
+    virtual void transferTouchFocus(const sp<IBinder>& fromToken, const sp<IBinder>& toToken);
 
     virtual void registerInputChannel(const sp<InputChannel>& channel);
     virtual void unregisterInputChannel(const sp<InputChannel>& channel);