Move tests to Presubmit

Moving some tests to Presubmit using the annotation tag (adding the annotation lib as dependency). These tests were working on post submit:
- AppPairsTest
- PipKeybopardTest
- EnterSplitScreenTest
- ExitSplitScreenTest

Test: atest WMShellFlickerTests
Change-Id: I10603cbb869044fce9d444ab7c2a8d761eb1ee74

libs/WindowManager/Shell/tests/flicker/src/com/android/wm/shell/flicker/apppairs/AppPairsTest.kt

@@ -16,6 +16,7 @@
 
 package com.android.wm.shell.flicker.apppairs
 
+import android.platform.test.annotations.Presubmit
 import android.os.SystemClock
 import android.util.Log
 import android.view.Surface
@@ -43,6 +44,7 @@ import java.io.IOException
  * Test AppPairs launch.
  * To run this test: `atest WMShellFlickerTests:AppPairsTest`
  */
+@Presubmit
 @RequiresDevice
 @RunWith(Parameterized::class)
 @FixMethodOrder(MethodSorters.NAME_ASCENDING)

libs/WindowManager/Shell/tests/flicker/src/com/android/wm/shell/flicker/pip/PipKeyboardTest.kt

@@ -16,6 +16,7 @@
 
 package com.android.wm.shell.flicker.pip
 
+import android.platform.test.annotations.Presubmit
 import android.view.Surface
 import androidx.test.filters.RequiresDevice
 import com.android.server.wm.flicker.dsl.FlickerBuilder
@@ -36,6 +37,7 @@ import org.junit.runners.Parameterized
  * Test Pip launch.
  * To run this test: `atest WMShellFlickerTests:PipKeyboardTest`
  */
+@Presubmit
 @RequiresDevice
 @RunWith(Parameterized::class)
 @FixMethodOrder(MethodSorters.NAME_ASCENDING)

libs/WindowManager/Shell/tests/flicker/src/com/android/wm/shell/flicker/splitscreen/EnterSplitScreenTest.kt

@@ -16,6 +16,7 @@
 
 package com.android.wm.shell.flicker.splitscreen
 
+import android.platform.test.annotations.Presubmit
 import android.view.Surface
 import androidx.test.filters.RequiresDevice
 import com.android.server.wm.flicker.dsl.FlickerBuilder
@@ -38,6 +39,7 @@ import org.junit.runners.Parameterized
  * Test SplitScreen launch.
  * To run this test: `atest WMShellFlickerTests:EnterSplitScreenTest`
  */
+@Presubmit
 @RequiresDevice
 @RunWith(Parameterized::class)
 @FixMethodOrder(MethodSorters.NAME_ASCENDING)

libs/WindowManager/Shell/tests/flicker/src/com/android/wm/shell/flicker/splitscreen/ExitSplitScreenTest.kt

@@ -16,6 +16,7 @@
 
 package com.android.wm.shell.flicker.splitscreen
 
+import android.platform.test.annotations.Presubmit
 import android.util.Rational
 import android.view.Surface
 import androidx.test.filters.FlakyTest
@@ -40,6 +41,7 @@ import org.junit.runners.Parameterized
  * Test exit SplitScreen mode.
  * To run this test: `atest WMShellFlickerTests:ExitSplitScreenTest`
  */
+@Presubmit
 @RequiresDevice
 @RunWith(Parameterized::class)
 @FixMethodOrder(MethodSorters.NAME_ASCENDING)