Update OpenImeWindowFromFixedOrientationAppTest (2nd)

To catch Bug 230733128 that the size of TaskSnapshotStartingWindow
surface wrongly rendered by not applying fixed-rotation when the
snapshot included IME,

Add snapshotStartingWindowLayerCoversExactlyOnApp to verify the
size of snapshotRegion should cover appVisibleRegion exactly
in animation.

Bug: 232242249
Test: atest FlickerTest:OpenImeWindowFromFixedOrientationAppTest
Change-Id: I709d8899381126efff82a43a0d39d3342079f122

tests/FlickerTests/src/com/android/server/wm/flicker/CommonAssertions.kt

@@ -18,6 +18,7 @@
 package com.android.server.wm.flicker
 
 import com.android.server.wm.flicker.helpers.WindowUtils
+import com.android.server.wm.flicker.traces.region.RegionSubject
 import com.android.server.wm.traces.common.FlickerComponentName
 
 val LAUNCHER_COMPONENT = FlickerComponentName("com.google.android.apps.nexuslauncher",
@@ -172,6 +173,33 @@ fun FlickerTestParameter.statusBarLayerRotatesScales() {
     statusBarLayerPositionEnd()
 }
 
+/**
+ * Asserts that the visibleRegion of the [FlickerComponentName.SNAPSHOT] layer can cover
+ * the visibleRegion of the given app component exactly
+ */
+fun FlickerTestParameter.snapshotStartingWindowLayerCoversExactlyOnApp(
+        component: FlickerComponentName) {
+    assertLayers {
+        invoke("snapshotStartingWindowLayerCoversExactlyOnApp") {
+            val snapshotLayers = it.subjects.filter { subject ->
+                subject.name.contains(
+                        FlickerComponentName.SNAPSHOT.toLayerName()) && subject.isVisible
+            }
+            // Verify the size of snapshotRegion covers appVisibleRegion exactly in animation.
+            if (snapshotLayers.isNotEmpty()) {
+                val visibleAreas = snapshotLayers.mapNotNull { snapshotLayer ->
+                    snapshotLayer.layer?.visibleRegion
+                }.toTypedArray()
+                val snapshotRegion = RegionSubject.assertThat(visibleAreas, this, timestamp)
+                val appVisibleRegion = it.visibleRegion(component)
+                if (snapshotRegion.region.isNotEmpty) {
+                    snapshotRegion.coversExactly(appVisibleRegion.region)
+                }
+            }
+        }
+    }
+}
+
 /**
  * Asserts that:
  *     [originalLayer] is visible at the start of the trace

tests/FlickerTests/src/com/android/server/wm/flicker/ime/OpenImeWindowFromFixedOrientationAppTest.kt

@@ -17,6 +17,7 @@
 package com.android.server.wm.flicker.ime
 
 import android.app.Instrumentation
+import android.platform.test.annotations.Postsubmit
 import android.platform.test.annotations.Presubmit
 import android.platform.test.annotations.RequiresDevice
 import android.view.Surface
@@ -34,6 +35,7 @@ import com.android.server.wm.flicker.helpers.ImeAppAutoFocusHelper
 import com.android.server.wm.flicker.helpers.setRotation
 import com.android.server.wm.flicker.navBarLayerPositionEnd
 import com.android.server.wm.flicker.navBarWindowIsVisible
+import com.android.server.wm.flicker.snapshotStartingWindowLayerCoversExactlyOnApp
 import com.android.server.wm.flicker.statusBarLayerRotatesScales
 import com.android.server.wm.flicker.statusBarWindowIsVisible
 import org.junit.FixMethodOrder
@@ -107,6 +109,12 @@ class OpenImeWindowFromFixedOrientationAppTest(private val testSpec: FlickerTest
     @Test
     fun imeLayerBecomesVisible() = testSpec.imeLayerBecomesVisible()
 
+    @Postsubmit
+    @Test
+    fun snapshotStartingWindowLayerCoversExactlyOnApp() {
+        testSpec.snapshotStartingWindowLayerCoversExactlyOnApp(imeTestApp.component)
+    }
+
     companion object {
         /**
          * Creates the test configurations.