Use ALWAYS_FATAL if touchState is out of sync

Converting an existing LOG(FATAL) to LOG_ALWAYS_FATAL. This methods is
always called with tokens that hvae been added to touchstate. So in this
CL we
1. Rename the method accordingly.
2. Add a LOG_ALWAYS_FATAL for cases this expectation is not met.

This is a followup from ag/31432556.

Test: atest inputflinger_tests
Bug: 245989146
Flag: EXEMPT TEST_ONLY
Change-Id: I18daa7a0086495b3a64df5286f94406d9c2c9ccb

Author: Arpit Singh

services/inputflinger/dispatcher/InputDispatcher.cpp

@@ -4235,13 +4235,8 @@ void InputDispatcher::synthesizePointerDownEventsForConnectionLocked(
             << "channel '" << connection->getInputChannelName() << "' ~ Synthesized "
             << downEvents.size() << " down events to ensure consistent event stream.";
 
-    auto touchedWindowHandleAndDisplay =
-            mTouchStates.findTouchedWindowHandleAndDisplay(connection->getToken());
-    if (!touchedWindowHandleAndDisplay.has_value()) {
-        LOG(FATAL) << __func__ << ": Touch state is out of sync: No touched window for token";
-    }
-
-    const auto [windowHandle, displayId] = touchedWindowHandleAndDisplay.value();
+    const auto [windowHandle, displayId] =
+            mTouchStates.findExistingTouchedWindowHandleAndDisplay(connection->getToken());
 
     const bool wasEmpty = connection->outboundQueue.empty();
     for (std::unique_ptr<EventEntry>& downEventEntry : downEvents) {
@@ -7397,8 +7392,8 @@ bool InputDispatcher::DispatcherTouchState::isPointerInWindow(const sp<android::
     return false;
 }
 
-std::optional<std::tuple<const sp<gui::WindowInfoHandle>&, ui::LogicalDisplayId>>
-InputDispatcher::DispatcherTouchState::findTouchedWindowHandleAndDisplay(
+std::tuple<const sp<gui::WindowInfoHandle>&, ui::LogicalDisplayId>
+InputDispatcher::DispatcherTouchState::findExistingTouchedWindowHandleAndDisplay(
         const sp<android::IBinder>& token) const {
     for (const auto& [displayId, state] : mTouchStatesByDisplay) {
         for (const TouchedWindow& w : state.windows) {
@@ -7407,7 +7402,7 @@ InputDispatcher::DispatcherTouchState::findTouchedWindowHandleAndDisplay(
             }
         }
     }
-    return std::nullopt;
+    LOG_ALWAYS_FATAL("%s : Touch state is out of sync: No touched window for token", __func__);
 }
 
 void InputDispatcher::DispatcherTouchState::forAllTouchedWindows(

services/inputflinger/dispatcher/InputDispatcher.h

@@ -396,9 +396,9 @@ class InputDispatcher : public android::InputDispatcherInterface {
         bool isPointerInWindow(const sp<android::IBinder>& token, ui::LogicalDisplayId displayId,
                                DeviceId deviceId, int32_t pointerId) const;
 
-        // Find touched windowHandle and display by token.
-        std::optional<std::tuple<const sp<gui::WindowInfoHandle>&, ui::LogicalDisplayId>>
-        findTouchedWindowHandleAndDisplay(const sp<IBinder>& token) const;
+        // Find an existing touched windowHandle and display by token.
+        std::tuple<const sp<gui::WindowInfoHandle>&, ui::LogicalDisplayId>
+        findExistingTouchedWindowHandleAndDisplay(const sp<IBinder>& token) const;
 
         void forAllTouchedWindows(std::function<void(const sp<gui::WindowInfoHandle>&)> f) const;