Try fix the mac build bot after removing Android SampleApp

platform_tools/android/apps/sample_app/build.gradle

Index: platform_tools/android/apps/sample_app/build.gradle
diff --git a/platform_tools/android/apps/sample_app/build.gradle b/platform_tools/android/apps/sample_app/build.gradle
deleted file mode 100644
index 46789804338048d5c3d36a56ecad05b9e666611f..0000000000000000000000000000000000000000
--- a/platform_tools/android/apps/sample_app/build.gradle
+++ /dev/null
@@ -1,30 +0,0 @@
-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
-    setupSkiaLibraryBuild(project, applicationVariants, "CopySampleAppDeps")
-}