Add zoom/pan functionality back to AOSP WallpaperPicker.

Bug: 70243090
Change-Id: Ib5145ea1ef22b50fa944c8b68b20ea09807f4629
diff --git a/build.gradle b/build.gradle
index 8b13c7d..b3dfd92 100755
--- a/build.gradle
+++ b/build.gradle
@@ -12,12 +12,12 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 27
-    buildToolsVersion "27.0.0"
+    compileSdkVersion 28
+    buildToolsVersion "28.0.0"
     defaultConfig {
         applicationId "com.android.wallpaper"
         minSdkVersion 26
-        targetSdkVersion 27
+        targetSdkVersion 28
         versionCode 1
         versionName "1.0"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
@@ -62,7 +62,7 @@
     }
 }
 
-final String SUPPORT_LIBS_VERSION = '27.0.1'
+final String SUPPORT_LIBS_VERSION = '28.0.0-SNAPSHOT'
 
 
 repositories {
@@ -84,6 +84,7 @@
     implementation 'com.github.bumptech.glide:glide:SNAPSHOT'
     implementation 'com.github.bumptech.glide:disklrucache:SNAPSHOT'
     implementation 'com.github.bumptech.glide:gifdecoder:SNAPSHOT'
+    implementation 'com.davemorrissey.labs:subsampling-scale-image-view:3.9.0'
 
 
     androidTestImplementation('junit:junit:4.12')