Support CAST V2 authentication

bug: 12702350

Squashed commit of these CLs from the widevine cdm repo:

Cast V2 cdm support
https://widevine-internal-review.googlesource.com/#/c/9190/

Add CASTv2 Support to DrmPlugin
https://widevine-internal-review.googlesource.com/#/c/9228/

Test for CastV2 authentication APIs
https://widevine-internal-review.googlesource.com/9550

Change-Id: I6d66bc1bbd653db5542c68687b30b441dd20617f

libwvdrmengine/test/castv2/AndroidManifest.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+      package="com.android.castv2.test"
+>
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-library android:name="com.android.mediadrm.signer"
+                  android:required="true" />
+
+    <uses-sdk android:minSdkVersion="18"></uses-sdk>
+    <application android:icon="@drawable/icon" android:label="@string/app_name" android:theme="@android:style/Theme.Holo.NoActionBar">
+        <activity android:name="CastSignAPITest"
+                  android:label="@string/app_name"
+                  android:screenOrientation="landscape">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>