Upgrade Android Gradle plugins

platform_tools/android/apps/sample_app/build.gradle

 apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 19
     buildToolsVersion "22.0.1"
 
     defaultConfig {
         applicationId "com.skia.sample_app"
         minSdkVersion 9
         targetSdkVersion 19
         versionCode 1
         versionName "1.0"
         signingConfig signingConfigs.debug
     }
 
     sourceSets.main.jni.srcDirs = [] //disable automatic ndk-build call
     sourceSets.main.jniLibs.srcDir "src/main/libs"
 
     productFlavors {
         arm {}
         arm64 {}
         x86 {}
         x86_64 {}
         mips {}
         mips64 {}
     }
 
     // make sure that app is built and shared libraries are copied to correct directories
-    applicationVariants.all{ variant ->
-
-        def buildNativeLib = task("${variant.name}_NativeLib", type:Exec) {
-            workingDir '../../../..' // top-level skia directory
-            commandLine constructBuildCommand(variant, "CopySampleAppDeps").split()
-            environment PATH: getPathWithDepotTools()
-            environment ANDROID_SDK_ROOT: getSDKPath()
-        }
-
-        buildNativeLib.onlyIf { !project.hasProperty("suppressNativeBuild") }
-
-        TaskCollection<Task> assembleTask
-        assembleTask = project.tasks.matching {
-            it.name.contains("assemble") &&
-                    it.name.toLowerCase().endsWith(variant.name.toLowerCase())
-        }
-        assembleTask.getAt(0).dependsOn buildNativeLib
-    }
+    setupSkiaLibraryBuild(project, applicationVariants, "CopySampleAppDeps")
 }