composer: deflake Test_expectedPresentTime

Test_expectedPresentTime might fail due to scheduling delays.
To avoid that, we test that the actual presentation didn't
happen too early, but we allow for a late presentation.

Bug: 198186194
Test: VTS
Change-Id: I9be4bfe5a848443e69ef7b62ffb3dae675a9b81f
diff --git a/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/VtsHalGraphicsComposer3_TargetTest.cpp b/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/VtsHalGraphicsComposer3_TargetTest.cpp
index a591aaa..24b742e 100644
--- a/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/VtsHalGraphicsComposer3_TargetTest.cpp
+++ b/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/VtsHalGraphicsComposer3_TargetTest.cpp
@@ -1426,8 +1426,7 @@
         presentFence2->waitForever(LOG_TAG);
 
         const auto actualPresentTime = presentFence2->getSignalTime();
-        const auto presentError = std::abs(expectedPresentTime - actualPresentTime);
-        EXPECT_LE(presentError, vsyncPeriod / 2);
+        EXPECT_GE(actualPresentTime, expectedPresentTime - vsyncPeriod / 2);
 
         ASSERT_TRUE(mComposerClient->setPowerMode(mPrimaryDisplay, PowerMode::OFF).isOk());
     }