LatinIME: Support building and running make-keyboard-text with gradle

Change-Id: I1ec3a7637fcd939f9475379f4836bf531590ac0c

Author: pgaskin

settings.gradle

@@ -1 +1,2 @@
 rootProject.name = "LatinIME"
+include ':tools:make-keyboard-text'

tools/make-keyboard-text/build.gradle

@@ -0,0 +1,40 @@
+plugins {
+    id 'application'
+}
+
+application {
+    mainClass = 'com.android.inputmethod.keyboard.tools.MakeKeyboardText'
+}
+
+sourceSets {
+    main.java.srcDir 'src'
+    main.resources.srcDir 'res'
+}
+
+jar {
+    manifest {
+        attributes 'Main-Class': application.mainClass
+    }
+}
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_1_8
+    targetCompatibility = JavaVersion.VERSION_1_8
+}
+
+tasks.register('generate', JavaExec) {
+    mainClass = application.mainClass
+    dependsOn jar
+    classpath jar.archiveFile
+    workingDir rootProject.projectDir
+    args '-java', 'java'
+
+    doLast {
+        println()
+        println("===========================================================================")
+        println('WARNING: The locales will be messed up when running this on a host JVM. You')
+        println('should manually merge the required changes.')
+        println('===========================================================================')
+        println()
+    }
+}