Update dependencies for MultiWindowPlayground sample.

Change-Id: I7ddec60766efaf104c5ed4b00806b512ed70dba1
diff --git a/ui/window/MultiWindowPlayground/Application/build.gradle b/ui/window/MultiWindowPlayground/Application/build.gradle
index c423c25..0cfa04c 100644
--- a/ui/window/MultiWindowPlayground/Application/build.gradle
+++ b/ui/window/MultiWindowPlayground/Application/build.gradle
@@ -20,7 +20,7 @@
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.2.3'
+        classpath 'com.android.tools.build:gradle:2.1.0-alpha1'
     }
 }
 
@@ -34,7 +34,7 @@
 
 android {
     compileSdkVersion 'android-N'
-    buildToolsVersion '23.0.1'
+    buildToolsVersion '24.0.0 rc1'
 
     defaultConfig {
         applicationId "com.android.multiwindowplayground"
@@ -60,7 +60,7 @@
 dependencies {
     compile fileTree(include: ['*.jar'], dir: 'libs')
     testCompile 'junit:junit:4.12'
-    compile 'com.android.support:appcompat-v7:23.2.0'
-    androidTestCompile 'com.android.support:support-annotations:23.2.0'
+    compile 'com.android.support:appcompat-v7:24.0.0-alpha1'
+    androidTestCompile 'com.android.support:support-annotations:24.0.0-alpha1'
     androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.1'
 }
diff --git a/ui/window/MultiWindowPlayground/gradle/wrapper/gradle-wrapper.properties b/ui/window/MultiWindowPlayground/gradle/wrapper/gradle-wrapper.properties
index afb3296..122a0dc 100644
--- a/ui/window/MultiWindowPlayground/gradle/wrapper/gradle-wrapper.properties
+++ b/ui/window/MultiWindowPlayground/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Wed Apr 10 15:27:10 PDT 2013
+#Mon Dec 28 10:00:20 PST 2015
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=http\://services.gradle.org/distributions/gradle-2.2.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.10-all.zip