Split pip tests in different modules to enable sharding and reduce runtime

Temporarily keep a `WMShellPipTests` module for compatibility with the presubmit configuration. This will be removed in a future CL after presubmit is updated to avoid causing instability

Bug: 301574363
Test: atest WMShellFlickerTestsPip
Change-Id: I3aa7de019ec1d2a0871206499bbc59fdf6677bf6
diff --git a/libs/WindowManager/Shell/tests/flicker/Android.bp b/libs/WindowManager/Shell/tests/flicker/Android.bp
index 7f02072..e111edc 100644
--- a/libs/WindowManager/Shell/tests/flicker/Android.bp
+++ b/libs/WindowManager/Shell/tests/flicker/Android.bp
@@ -39,7 +39,25 @@
 }
 
 filegroup {
-    name: "WMShellFlickerTestsPip-src",
+    name: "WMShellFlickerTestsPip1-src",
+    srcs: [
+        "src/com/android/wm/shell/flicker/pip/A*.kt",
+        "src/com/android/wm/shell/flicker/pip/B*.kt",
+        "src/com/android/wm/shell/flicker/pip/C*.kt",
+        "src/com/android/wm/shell/flicker/pip/D*.kt",
+        "src/com/android/wm/shell/flicker/pip/S*.kt",
+    ],
+}
+
+filegroup {
+    name: "WMShellFlickerTestsPip2-src",
+    srcs: [
+        "src/com/android/wm/shell/flicker/pip/E*.kt",
+    ],
+}
+
+filegroup {
+    name: "WMShellFlickerTestsPip3-src",
     srcs: ["src/com/android/wm/shell/flicker/pip/*.kt"],
 }
 
@@ -176,7 +194,9 @@
     ],
     exclude_srcs: [
         ":WMShellFlickerTestsBubbles-src",
-        ":WMShellFlickerTestsPip-src",
+        ":WMShellFlickerTestsPip1-src",
+        ":WMShellFlickerTestsPip2-src",
+        ":WMShellFlickerTestsPip3-src",
         ":WMShellFlickerTestsPipCommon-src",
         ":WMShellFlickerTestsPipApps-src",
         ":WMShellFlickerTestsSplitScreenGroup1-src",
@@ -207,12 +227,55 @@
     instrumentation_target_package: "com.android.wm.shell.flicker.pip",
     srcs: [
         ":WMShellFlickerTestsBase-src",
-        ":WMShellFlickerTestsPip-src",
+        ":WMShellFlickerTestsPip3-src",
         ":WMShellFlickerTestsPipCommon-src",
     ],
 }
 
 android_test {
+    name: "WMShellFlickerTestsPip1",
+    defaults: ["WMShellFlickerTestsDefault"],
+    additional_manifests: ["manifests/AndroidManifestPip.xml"],
+    package_name: "com.android.wm.shell.flicker.pip",
+    instrumentation_target_package: "com.android.wm.shell.flicker.pip",
+    srcs: [
+        ":WMShellFlickerTestsBase-src",
+        ":WMShellFlickerTestsPip1-src",
+        ":WMShellFlickerTestsPipCommon-src",
+    ],
+}
+
+android_test {
+    name: "WMShellFlickerTestsPip2",
+    defaults: ["WMShellFlickerTestsDefault"],
+    additional_manifests: ["manifests/AndroidManifestPip.xml"],
+    package_name: "com.android.wm.shell.flicker.pip",
+    instrumentation_target_package: "com.android.wm.shell.flicker.pip",
+    srcs: [
+        ":WMShellFlickerTestsBase-src",
+        ":WMShellFlickerTestsPip2-src",
+        ":WMShellFlickerTestsPipCommon-src",
+    ],
+}
+
+android_test {
+    name: "WMShellFlickerTestsPip3",
+    defaults: ["WMShellFlickerTestsDefault"],
+    additional_manifests: ["manifests/AndroidManifestPip.xml"],
+    package_name: "com.android.wm.shell.flicker.pip",
+    instrumentation_target_package: "com.android.wm.shell.flicker.pip",
+    srcs: [
+        ":WMShellFlickerTestsBase-src",
+        ":WMShellFlickerTestsPip3-src",
+        ":WMShellFlickerTestsPipCommon-src",
+    ],
+    exclude_srcs: [
+        ":WMShellFlickerTestsPip1-src",
+        ":WMShellFlickerTestsPip2-src",
+    ],
+}
+
+android_test {
     name: "WMShellFlickerTestsPipApps",
     defaults: ["WMShellFlickerTestsDefault"],
     additional_manifests: ["manifests/AndroidManifestPip.xml"],
diff --git a/libs/WindowManager/Shell/tests/flicker/src/com/android/wm/shell/flicker/pip/AutoEnterPipOnGoToHomeTest.kt b/libs/WindowManager/Shell/tests/flicker/src/com/android/wm/shell/flicker/pip/AutoEnterPipOnGoToHomeTest.kt
index 19c8435..94e3959 100644
--- a/libs/WindowManager/Shell/tests/flicker/src/com/android/wm/shell/flicker/pip/AutoEnterPipOnGoToHomeTest.kt
+++ b/libs/WindowManager/Shell/tests/flicker/src/com/android/wm/shell/flicker/pip/AutoEnterPipOnGoToHomeTest.kt
@@ -22,6 +22,7 @@
 import android.tools.device.flicker.legacy.LegacyFlickerTest
 import androidx.test.filters.FlakyTest
 import androidx.test.filters.RequiresDevice
+import com.android.wm.shell.flicker.pip.common.EnterPipTransition
 import org.junit.Assume
 import org.junit.FixMethodOrder
 import org.junit.Test
@@ -55,7 +56,7 @@
 @Parameterized.UseParametersRunnerFactory(FlickerParametersRunnerFactory::class)
 @FixMethodOrder(MethodSorters.NAME_ASCENDING)
 open class AutoEnterPipOnGoToHomeTest(flicker: LegacyFlickerTest) :
-    EnterPipViaAppUiButtonTest(flicker) {
+    EnterPipTransition(flicker) {
     override val thisTransition: FlickerBuilder.() -> Unit = { transitions { tapl.goHome() } }
 
     override val defaultEnterPip: FlickerBuilder.() -> Unit = {