Add CMake path to gradle

platform_tools/android/apps/vulkanviewer/build.gradle

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 apply plugin: 'com.android.application'
 android {
     compileSdkVersion 19
     buildToolsVersion "22.0.1"
     defaultConfig {
         applicationId "org.skia.vulkanviewer"
         minSdkVersion 19
         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 {}; }
 
-    setupSkiaLibraryBuild(project, applicationVariants, "--vulkan CopyVulkanViewerDeps")
+    setupSkiaLibraryBuild(project, applicationVariants, "--vulkan CopyVulkanViewerDeps", true)
 }