Resolve resolve native Flutter dependencies in Android Studio (flutter#167332)

With this fix you can edit Flutter and native code in one Android Studio
instance. This fixes flutter#19830

The only downside is that you need to copy the files `settings.gradle`,
`build.gradle` and `local.properteis` from the `android` folder to the
project root folder. The last one should be added to the `.gitignore`
file.

The second step is that you need to correct the path in the
`settings.gradle` at the end is:
```groovy
include ':app'
```
That needs to be replaced with:
```groovy
include ':app'
project(':app').projectDir = new File(rootDir, 'android/app/')
```

The cool thing is if you have two flutter projects or another gradle
module you can include them there too and you get the autocompletion
too.

```groovy
include ':app', ':app2', ':native-lib'
project(':app').projectDir = new File(rootDir, 'android/app/')
project(':app2').projectDir = new File(rootDir, 'app2/android/app/')
project(':native-lib').projectDir = new File(rootDir, 'example/native-lib/')
```

My assumption is that there will be some change requests and some
questions. Feel free to ask

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Author: rekire

packages/flutter_tools/gradle/src/main/kotlin/FlutterPlugin.kt

@@ -20,6 +20,7 @@ import org.gradle.api.Task
 import org.gradle.api.UnknownTaskException
 import org.gradle.api.file.Directory
 import org.gradle.api.tasks.Copy
+import org.gradle.api.tasks.TaskInstantiationException
 import org.gradle.api.tasks.TaskProvider
 import org.gradle.api.tasks.bundling.Jar
 import org.gradle.internal.os.OperatingSystem
@@ -97,6 +98,13 @@ class FlutterPlugin : Plugin<Project> {
             repositories.maven {
                 url = uri(repository!!)
             }
+            if (plugins.hasPlugin("com.android.application") && isInvokedFromAndroidStudio()) {
+                dependencies.add("compileOnly", "io.flutter:flutter_embedding_debug:$engineVersion")
+                dependencies.add("compileOnly", "io.flutter:armeabi_v7a_debug:$engineVersion")
+                dependencies.add("compileOnly", "io.flutter:arm64_v8a_debug:$engineVersion")
+                dependencies.add("compileOnly", "io.flutter:x86_debug:$engineVersion")
+                dependencies.add("compileOnly", "io.flutter:x86_64_debug:$engineVersion")
+            }
         }
 
         project.apply {
@@ -292,19 +300,23 @@ class FlutterPlugin : Plugin<Project> {
     }
 
     private fun addTaskForLockfileGeneration(rootProject: Project) {
-        rootProject.tasks.register("generateLockfiles") {
-            doLast {
-                rootProject.subprojects.forEach { subproject ->
-                    val gradlew: String =
-                        getExecutableNameForPlatform("${rootProject.projectDir}/gradlew")
-                    val execOps = rootProject.serviceOf<ExecOperations>()
-                    execOps.exec {
-                        workingDir(rootProject.projectDir)
-                        executable(gradlew)
-                        args(":${subproject.name}:dependencies", "--write-locks")
+        try {
+            rootProject.tasks.register("generateLockfiles") {
+                doLast {
+                    rootProject.subprojects.forEach { subproject ->
+                        val gradlew: String =
+                            getExecutableNameForPlatform("${rootProject.projectDir}/gradlew")
+                        val execOps = rootProject.serviceOf<ExecOperations>()
+                        execOps.exec {
+                            workingDir(rootProject.projectDir)
+                            executable(gradlew)
+                            args(":${subproject.name}:dependencies", "--write-locks")
+                        }
                     }
                 }
             }
+        } catch (e: TaskInstantiationException) {
+            // ignored
         }
     }
 
@@ -773,4 +785,12 @@ class FlutterPlugin : Plugin<Project> {
             return copyFlutterAssetsTask
         }
     }
+
+    /**
+     * Returns true if the Gradle task is invoked by Android Studio.
+     *
+     * This is true when the property `android.injected.invoked.from.ide` is passed to Gradle.
+     * This property is set by Android Studio when it invokes a Gradle task.
+     */
+    private fun isInvokedFromAndroidStudio(): Boolean = project?.hasProperty("android.injected.invoked.from.ide") == true
 }