Revert "Revert "Remove notifyConfigurationChanged listener and p..."

Revert submission 28384450-revert-28338641-remove_notify_configuration_changed-KXBQXRGFTY

Reason for revert: Builds started passing.

Reverted changes: /q/submissionid:28384450-revert-28338641-remove_notify_configuration_changed-KXBQXRGFTY

Change-Id: I6e9ffd1fbb5cf6edcbc08591e615bc1d1d383ea6
diff --git a/services/inputflinger/reader/EventHub.cpp b/services/inputflinger/reader/EventHub.cpp
index 9381580..e11adb8 100644
--- a/services/inputflinger/reader/EventHub.cpp
+++ b/services/inputflinger/reader/EventHub.cpp
@@ -888,7 +888,6 @@
       : mBuiltInKeyboardId(NO_BUILT_IN_KEYBOARD),
         mNextDeviceId(1),
         mControllerNumbers(),
-        mNeedToSendFinishedDeviceScan(false),
         mNeedToReopenDevices(false),
         mNeedToScanDevices(true),
         mPendingEventCount(0),
@@ -1877,7 +1876,6 @@
                     .type = DEVICE_REMOVED,
             });
             it = mClosingDevices.erase(it);
-            mNeedToSendFinishedDeviceScan = true;
             if (events.size() == EVENT_BUFFER_SIZE) {
                 break;
             }
@@ -1886,7 +1884,6 @@
         if (mNeedToScanDevices) {
             mNeedToScanDevices = false;
             scanDevicesLocked();
-            mNeedToSendFinishedDeviceScan = true;
         }
 
         while (!mOpeningDevices.empty()) {
@@ -1915,18 +1912,6 @@
             if (!inserted) {
                 ALOGW("Device id %d exists, replaced.", device->id);
             }
-            mNeedToSendFinishedDeviceScan = true;
-            if (events.size() == EVENT_BUFFER_SIZE) {
-                break;
-            }
-        }
-
-        if (mNeedToSendFinishedDeviceScan) {
-            mNeedToSendFinishedDeviceScan = false;
-            events.push_back({
-                    .when = now,
-                    .type = FINISHED_DEVICE_SCAN,
-            });
             if (events.size() == EVENT_BUFFER_SIZE) {
                 break;
             }
diff --git a/services/inputflinger/reader/InputReader.cpp b/services/inputflinger/reader/InputReader.cpp
index 9e9e816..f0e53b5 100644
--- a/services/inputflinger/reader/InputReader.cpp
+++ b/services/inputflinger/reader/InputReader.cpp
@@ -180,6 +180,9 @@
         }
 
         if (oldGeneration != mGeneration) {
+            // Reset global meta state because it depends on connected input devices.
+            updateGlobalMetaStateLocked();
+
             inputDevicesChanged = true;
             inputDevices = getInputDevicesLocked();
             mPendingArgs.emplace_back(
@@ -212,15 +215,6 @@
         mPolicy->notifyInputDevicesChanged(inputDevices);
     }
 
-    // Notify the policy of configuration change. This must be after policy is notified about input
-    // device changes so that policy can fetch newly added input devices on configuration change.
-    for (const auto& args : notifyArgs) {
-        const auto* configArgs = std::get_if<NotifyConfigurationChangedArgs>(&args);
-        if (configArgs != nullptr) {
-            mPolicy->notifyConfigurationChanged(configArgs->eventTime);
-        }
-    }
-
     // Notify the policy of the start of every new stylus gesture.
     for (const auto& args : notifyArgs) {
         const auto* motionArgs = std::get_if<NotifyMotionArgs>(&args);
@@ -256,9 +250,6 @@
                 case EventHubInterface::DEVICE_REMOVED:
                     removeDeviceLocked(rawEvent->when, rawEvent->deviceId);
                     break;
-                case EventHubInterface::FINISHED_DEVICE_SCAN:
-                    handleConfigurationChangedLocked(rawEvent->when);
-                    break;
                 default:
                     ALOG_ASSERT(false); // can't happen
                     break;
@@ -423,14 +414,6 @@
     return ++mNextInputDeviceId;
 }
 
-void InputReader::handleConfigurationChangedLocked(nsecs_t when) {
-    // Reset global meta state because it depends on the list of all configured devices.
-    updateGlobalMetaStateLocked();
-
-    // Enqueue configuration changed.
-    mPendingArgs.emplace_back(NotifyConfigurationChangedArgs{mContext.getNextId(), when});
-}
-
 void InputReader::refreshConfigurationLocked(ConfigurationChanges changes) {
     mPolicy->getReaderConfiguration(&mConfig);
     mEventHub->setExcludedDevices(mConfig.excludedDeviceNames);
diff --git a/services/inputflinger/reader/include/EventHub.h b/services/inputflinger/reader/include/EventHub.h
index c647558..657126a 100644
--- a/services/inputflinger/reader/include/EventHub.h
+++ b/services/inputflinger/reader/include/EventHub.h
@@ -254,9 +254,6 @@
         DEVICE_ADDED = 0x10000000,
         // Sent when a device is removed.
         DEVICE_REMOVED = 0x20000000,
-        // Sent when all added/removed devices from the most recent scan have been reported.
-        // This event is always sent at least once.
-        FINISHED_DEVICE_SCAN = 0x30000000,
 
         FIRST_SYNTHETIC_EVENT = DEVICE_ADDED,
     };
@@ -789,7 +786,6 @@
     std::vector<std::unique_ptr<Device>> mOpeningDevices;
     std::vector<std::unique_ptr<Device>> mClosingDevices;
 
-    bool mNeedToSendFinishedDeviceScan;
     bool mNeedToReopenDevices;
     bool mNeedToScanDevices;
     std::vector<std::string> mExcludedDevices;
diff --git a/services/inputflinger/reader/include/InputReader.h b/services/inputflinger/reader/include/InputReader.h
index 03ca840..4f60a8a 100644
--- a/services/inputflinger/reader/include/InputReader.h
+++ b/services/inputflinger/reader/include/InputReader.h
@@ -221,8 +221,6 @@
                                                                      size_t count) REQUIRES(mLock);
     [[nodiscard]] std::list<NotifyArgs> timeoutExpiredLocked(nsecs_t when) REQUIRES(mLock);
 
-    void handleConfigurationChangedLocked(nsecs_t when) REQUIRES(mLock);
-
     int32_t mGlobalMetaState GUARDED_BY(mLock);
     void updateGlobalMetaStateLocked() REQUIRES(mLock);
     int32_t getGlobalMetaStateLocked() REQUIRES(mLock);