Add Android device testers for WebRTC.

masters/master.client.webrtc/slaves.cfg

Index: masters/master.client.webrtc/slaves.cfg
diff --git a/masters/master.client.webrtc/slaves.cfg b/masters/master.client.webrtc/slaves.cfg
index 79fc5f7c0a269d40c6e7570e441af83ddc4ee7e4..becc9f820646178ae6be0e9daf89718d75e168f9 100644
--- a/masters/master.client.webrtc/slaves.cfg
+++ b/masters/master.client.webrtc/slaves.cfg
@@ -25,7 +25,8 @@ slaves = [
     'version': 'precise',
     'bits': '64',
     'builder': [
-      'Android NDK',
+      'Android Builder',
+      'Android Builder (dbg)',
       'Chrome OS',
       'Linux64 Debug',
       'Linux64 Release',
@@ -49,6 +50,19 @@ slaves = [
     'hostname': 'chromeperf88',
   }
 ] + [
+  # Bare-metal Linux 64-bit machines with Android devices connected.
+  {
+    'master': 'WebRTC',
+    'os': 'linux',
+    'version': 'precise',
+    'bits': '64',
+    'builder': [
+      'Android Tests',
+      'Android Tests (dbg)',
+    ],
+    'hostname': 'build%d-a3' % i,
+  } for i in range(1, 3)
+] + [
   # Mac.
   {
     'master': 'WebRTC',