Pin AGP 'debug.keystore' in the repo.

This change adds shared 'debug.keystore' into the repository and
sets all the tests to use it.

Fixes issue when keystore was created by AGP 7+, but then consumed in
the test using lower versions of AGP.

^KT-45745 In Progress

libraries/tools/gradle/android-test-fixes/Readme.md

@@ -0,0 +1,4 @@
+## Description
+
+Contains a plugin for Gradle integration tests applying different fixes
+for test that are using Android Gradle plugin.

libraries/tools/gradle/android-test-fixes/build.gradle.kts

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+import plugins.KotlinBuildPublishingPlugin
+
+plugins {
+    id("java-gradle-plugin")
+    id("gradle-plugin-common-configuration")
+    id("com.gradle.plugin-publish")
+}
+
+repositories {
+    google()
+}
+
+dependencies {
+    compileOnly(gradleKotlinDsl())
+    compileOnly("com.android.tools.build:gradle:3.4.0")
+    compileOnly("com.android.tools.build:gradle-api:3.4.0")
+    compileOnly("com.android.tools.build:builder:3.4.0")
+    compileOnly("com.android.tools.build:builder-model:3.4.0")
+}
+
+configure<GradlePluginDevelopmentExtension> {
+    isAutomatedPublishing = false
+}
+
+gradlePlugin {
+    (plugins) {
+        create("android-test-fixes") {
+            id = "org.jetbrains.kotlin.test.fixes.android"
+            implementationClass = "org.jetbrains.kotlin.gradle.test.fixes.android.AndroidTestFixesPlugin"
+        }
+    }
+}
+
+pluginBundle {
+    (plugins) {
+        named("android-test-fixes") {
+            id = "org.jetbrains.kotlin.test.fixes.android"
+            displayName = "AndroidTestFixes"
+        }
+    }
+}
+
+publishPluginMarkers()
+
+// Disable releasing for this plugin
+// It is not intended to be released publicly
+tasks.withType<PublishToMavenRepository>()
+    .configureEach {
+        if (name.endsWith("PublicationTo${KotlinBuildPublishingPlugin.REPOSITORY_NAME}Repository")) {
+            enabled = false
+        }
+    }
+
+tasks.named("publishPlugins") {
+    enabled = false
+}

libraries/tools/gradle/android-test-fixes/src/main/kotlin/org/jetbrains/kotlin/gradle/test/fixes/android/AndroidTestFixesPlugin.kt

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+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.gradle.test.fixes.android
+
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import org.jetbrains.kotlin.gradle.test.fixes.android.fixes.applyDebugKeystoreFix
+
+class AndroidTestFixesPlugin : Plugin<Project> {
+    override fun apply(target: Project) {
+        val testFixesProperties = TestFixesProperties(target)
+        target.applyDebugKeystoreFix(testFixesProperties)
+    }
+}

libraries/tools/gradle/android-test-fixes/src/main/kotlin/org/jetbrains/kotlin/gradle/test/fixes/android/TestFixesProperties.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.gradle.test.fixes.android
+
+import org.gradle.api.Project
+
+internal class TestFixesProperties(
+    private val project: Project
+) {
+    val androidDebugKeystoreLocation: String
+        get() = project.findProperty(ANDROID_DEBUG_KEYSTORE_LOCATION) as String? ?: throw IllegalArgumentException(
+            "$ANDROID_DEBUG_KEYSTORE_LOCATION property was not found in 'gradle.properties'."
+        )
+
+    companion object {
+        private const val PROP_PREFIX = "test.fixes."
+        private const val ANDROID_DEBUG_KEYSTORE_LOCATION = "${PROP_PREFIX}android.debugKeystore"
+    }
+}

libraries/tools/gradle/android-test-fixes/src/main/kotlin/org/jetbrains/kotlin/gradle/test/fixes/android/fixes/debugKeystoreFix.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.gradle.test.fixes.android.fixes
+
+import com.android.build.gradle.AppExtension
+import com.android.build.gradle.BaseExtension
+import com.android.build.gradle.TestExtension
+import org.gradle.api.Action
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import org.gradle.kotlin.dsl.configure
+import org.jetbrains.kotlin.gradle.test.fixes.android.TestFixesProperties
+
+/**
+ * AGP 7+ creates a keystore that is not compatible with lover versions of AGP,
+ * but could consume keystores created by them.
+ *
+ * With this fix 'debug.keystore' could be checked in into the repo and shared
+ * between test executions.
+ */
+internal fun Project.applyDebugKeystoreFix(
+    testFixesProperties: TestFixesProperties
+) {
+    plugins.withId("com.android.application", fix<AppExtension>(testFixesProperties))
+    plugins.withId("com.android.test", fix<TestExtension>(testFixesProperties))
+}
+
+private inline fun <reified AndroidExtension : BaseExtension> Project.fix(
+    testFixesProperties: TestFixesProperties
+): Action<Plugin<*>> = Action {
+    extensions.configure<AndroidExtension> {
+        logger.info("Reconfiguring Android debug keystore")
+        buildTypes.named("debug") {
+            it.signingConfig?.storeFile = file(testFixesProperties.androidDebugKeystoreLocation)
+        }
+    }
+}