Rename sequenceNum to ID.

This is for consistency with ID in other places. Change it to signed
type to match Java int type.

Bug: 144889238
Test: atest inputflinger_tests
Change-Id: I8b6782a67f28aa13f7feaed2c97b8e87105019db
diff --git a/services/inputflinger/reader/include/InputReader.h b/services/inputflinger/reader/include/InputReader.h
index ca1a081..eaa105a 100644
--- a/services/inputflinger/reader/include/InputReader.h
+++ b/services/inputflinger/reader/include/InputReader.h
@@ -111,7 +111,7 @@
         virtual InputReaderPolicyInterface* getPolicy() override;
         virtual InputListenerInterface* getListener() override;
         virtual EventHubInterface* getEventHub() override;
-        virtual uint32_t getNextSequenceNum() override;
+        virtual int32_t getNextId() override;
     } mContext;
 
     friend class ContextImpl;
@@ -132,8 +132,8 @@
 
     InputReaderConfiguration mConfig;
 
-    // used by InputReaderContext::getNextSequenceNum() as a counter for event sequence numbers
-    uint32_t mNextSequenceNum;
+    // used by InputReaderContext::getNextId() as a counter for event sequence numbers
+    uint32_t mNextId;
 
     // The event queue.
     static const int EVENT_BUFFER_SIZE = 256;