Update Android Apps to use gradle

platform_tools/android/apps/visualbench/build.gradle

+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 19
+    buildToolsVersion "22.0.1"
+
+    defaultConfig {
+        applicationId "com.skia.visualbench"
+        minSdkVersion 9
+        targetSdkVersion 19
+        versionCode 1
+        versionName "1.0"
+    }
+
+    sourceSets.main.jni.srcDirs = [] //disable automatic ndk-build call
+    sourceSets.main.jniLibs.srcDir "src/main/libs"
+
+    productFlavors {
+        arm {}
+        arm64 {}
+        x86 {}
+        x86_64 {}
+    }
+
+    // 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, "CopyVisualBenchDeps").split()
+            environment PATH: getPathWithDepotTools()
+            environment ANDROID_SDK_ROOT: getSDKPath()
+        }
+
+        if (!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
+        }
+    }
+}