Update core.jar to r2864 in google3.

Path in google3:
//depot/google3/third_party/zxing/java/core.jar

Bug: 21592800

Change-Id: I7d36b4d301a0726caa5838fcf4da555c291bc2b9
diff --git a/core/README.google b/core/README.google
index 03c873e..420ec2b 100644
--- a/core/README.google
+++ b/core/README.google
@@ -1,6 +1,6 @@
-URL: svn checkout -r 1937 http://zxing.googlecode.com/svn/trunk/ zxing-read-only
+URL: http://zxing.googlecode.com/svn/!svn/bc/2864/trunk/
 
-Version: 1.7.1 (Revision: r1937)
+Version: r2864
 
 License: Apache License 2.0
 
@@ -13,4 +13,4 @@
 clients for J2ME, J2SE, and Android.
 
 Local Modifications:
-No modifications.
+See https://cs.corp.google.com/#piper///depot/google3/third_party/zxing/README.google.
diff --git a/core/build.gradle b/core/build.gradle
new file mode 100644
index 0000000..084a48f
--- /dev/null
+++ b/core/build.gradle
@@ -0,0 +1 @@
+artifacts.add('default', file('core.jar'))
\ No newline at end of file
diff --git a/core/core.jar b/core/core.jar
index 43a3140..64c658c 100644
--- a/core/core.jar
+++ b/core/core.jar
Binary files differ
diff --git a/qr_scanner/build.gradle b/qr_scanner/build.gradle
new file mode 100644
index 0000000..bf997a6
--- /dev/null
+++ b/qr_scanner/build.gradle
@@ -0,0 +1,13 @@
+apply plugin: 'com.android.library'
+
+android {
+    sourceSets.main {
+        manifest.srcFile 'AndroidManifest.xml'
+        java.srcDirs = ['src']
+        res.srcDirs = ['res']
+    }
+}
+
+dependencies {
+    compile project(':zxing-core')
+}
\ No newline at end of file