Return events from mappers and InputDevice

We are changing the way android input events are reported from the
InputReader. Previously, the process was opaque - anywhere in the code
you were allowed to grab the listener and send events to it. Now, the
flow changes - you will have to explicitly return the events back to the
caller.

With the new approach, InputReader will ultimately be the one
dispatching the events to the listener.

Bug: 211379801
Test: atest inputflinger_tests
Change-Id: I2318ad1220fa66b197ca2a49b8625afcfb45103f
diff --git a/services/inputflinger/reader/mapper/RotaryEncoderInputMapper.h b/services/inputflinger/reader/mapper/RotaryEncoderInputMapper.h
index 42e2421..f4352e7 100644
--- a/services/inputflinger/reader/mapper/RotaryEncoderInputMapper.h
+++ b/services/inputflinger/reader/mapper/RotaryEncoderInputMapper.h
@@ -29,10 +29,11 @@
     virtual uint32_t getSources() const override;
     virtual void populateDeviceInfo(InputDeviceInfo* deviceInfo) override;
     virtual void dump(std::string& dump) override;
-    virtual void configure(nsecs_t when, const InputReaderConfiguration* config,
-                           uint32_t changes) override;
-    virtual void reset(nsecs_t when) override;
-    virtual void process(const RawEvent* rawEvent) override;
+    [[nodiscard]] std::list<NotifyArgs> configure(nsecs_t when,
+                                                  const InputReaderConfiguration* config,
+                                                  uint32_t changes) override;
+    [[nodiscard]] std::list<NotifyArgs> reset(nsecs_t when) override;
+    [[nodiscard]] std::list<NotifyArgs> process(const RawEvent* rawEvent) override;
 
 private:
     CursorScrollAccumulator mRotaryEncoderScrollAccumulator;
@@ -41,7 +42,7 @@
     float mScalingFactor;
     int32_t mOrientation;
 
-    void sync(nsecs_t when, nsecs_t readTime);
+    [[nodiscard]] std::list<NotifyArgs> sync(nsecs_t when, nsecs_t readTime);
 };
 
 } // namespace android