Make Chips work on API 11+

By using the support library, and copying a few methods from TextView
into RecipientEditTextView, we can support chips back to API 11.

Bug: 8744878
Change-Id: I2d9bb43e71556504e929dcdccff9dae347020f28
diff --git a/chips/AndroidManifest.xml b/chips/AndroidManifest.xml
index fd7775d..7487c18 100644
--- a/chips/AndroidManifest.xml
+++ b/chips/AndroidManifest.xml
@@ -16,4 +16,9 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="com.android.ex.chips"
           android:versionCode="1">
-</manifest>
+
+    <uses-sdk
+        android:minSdkVersion="11"
+        android:targetSdkVersion="18" />
+
+</manifest>
\ No newline at end of file