Refactor VideoCapturerAndroid tests in WebRTC.

webrtc/api/java/android/org/webrtc/CameraEnumerationAndroid.java

Index: webrtc/api/java/android/org/webrtc/CameraEnumerationAndroid.java
diff --git a/webrtc/api/java/android/org/webrtc/CameraEnumerationAndroid.java b/webrtc/api/java/android/org/webrtc/CameraEnumerationAndroid.java
index 44c850538ef3e3e78beee70a41eb9206b5bf3744..ed93bd12a0fe6af831a4a27db268f86b0deb3791 100644
--- a/webrtc/api/java/android/org/webrtc/CameraEnumerationAndroid.java
+++ b/webrtc/api/java/android/org/webrtc/CameraEnumerationAndroid.java
@@ -11,10 +11,11 @@
 package org.webrtc;
 
 import static java.lang.Math.abs;
-import android.graphics.ImageFormat;
 
 import org.webrtc.Logging;
 
+import android.graphics.ImageFormat;
+
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
@@ -137,6 +138,18 @@ public class CameraEnumerationAndroid {
         + ", Orientation " + info.orientation;
   }
 
+  // Returns the camera index for camera with name |deviceName|, or throws IllegalArgumentException
+  // if no such camera can be found.
+  public static int getCameraIndex(String deviceName) {
+    Logging.d(TAG, "getCameraIndex: " + deviceName);
+    for (int i = 0; i < android.hardware.Camera.getNumberOfCameras(); ++i) {
+      if (deviceName.equals(CameraEnumerationAndroid.getDeviceName(i))) {
+        return i;
+      }
+    }
+    throw new IllegalArgumentException("No such camera: " + deviceName);
+  }
+
   // Returns the name of the front facing camera. Returns null if the
   // camera can not be used or does not exist.
   public static String getNameOfFrontFacingDevice() {