Update Android Apps to use gradle

platform_tools/android/apps/build.gradle

Index: platform_tools/android/apps/build.gradle
diff --git a/platform_tools/android/apps/build.gradle b/platform_tools/android/apps/build.gradle
new file mode 100644
index 0000000000000000000000000000000000000000..b20334b887694d3bb8652ae46ae61debc35dc1f9
--- /dev/null
+++ b/platform_tools/android/apps/build.gradle
@@ -0,0 +1,86 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+    repositories {
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:1.2.3'
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        jcenter()
+    }
+}
+
+def getLocalProperties() {
+    Properties properties = new Properties()
+    File propFile = project.rootProject.file('local.properties')
+    if (propFile.canRead()) {
+        properties.load(propFile.newDataInputStream())
+    }
+    propFile = project.rootProject.file('gradle.properties')
+    if (propFile.canRead()) {
+        properties.load(propFile.newDataInputStream())
+    }
+    return properties
+}
+
+def getSDKPath() {
+    String path = System.getenv("ANDROID_SDK_ROOT")
+    if (path == null) {
+        path = getLocalProperties().getProperty('sdk.dir', null)
+    }
+
+    if (path == null) {
+        throw new GradleScriptException("Android SDK not found! Please set ANDROID_SDK_ROOT to" +
+                                        " your path or define sdk.dir in gradle.properties")
+    }
+    return path
+}
+
+def getPathWithDepotTools() {
+    System.getenv("PATH") + ":" + getLocalProperties().getProperty('depot_tools.dir', null)
+    String path = System.getenv("PATH")
+    if (!path.contains("depot_tools")) {
+        path += ":" + getLocalProperties().getProperty('depot_tools.dir', null)
+    }
+
+    if (!path.contains("depot_tools")) {
+        throw GradleScriptException("Depot Tools not found! Please update your path to include" +
+                                    " depot_tools or define depot_tools.dir in gradle.properties")
+    }
+    return path
+}
+
+def constructBuildCommand(variant, buildTarget) {
+    String cmdLine = "./platform_tools/android/bin/android_ninja $buildTarget"
+    String deviceType = null
+    if (variant.name.startsWith("arm64")) {
+        deviceType = "arm64"
+    } else if (variant.name.startsWith("arm")) {
+        deviceType = "arm_v7_neon"
+    } else if (variant.name.startsWith("x86_64")) {
+        deviceType = "x86_64"
+    } else if (variant.name.startsWith("x86")) {
+        deviceType = "x86"
+    } else if (variant.name.startsWith("mips")) {
+        deviceType = "mips"
+    } else if (variant.name.startsWith("mips64")) {
+        deviceType = "mips64"
+    }
+
+    if (deviceType != null) {
+        cmdLine += " -d " + deviceType
+    }
+
+    if (variant.name.endsWith("Release")) {
+        cmdLine += " --release"
+    }
+    return cmdLine
+}