Add JSON and MB configs for the internal iOS bots.

tools_webrtc/ios/internal.client.webrtc/iOS64_Debug.json

Index: tools_webrtc/ios/internal.client.webrtc/iOS64_Debug.json
diff --git a/tools_webrtc/ios/internal.client.webrtc/iOS64_Debug.json b/tools_webrtc/ios/internal.client.webrtc/iOS64_Debug.json
new file mode 100644
index 0000000000000000000000000000000000000000..37074b6f3e89ca71bd4f176684b58323fec2c0ff
--- /dev/null
+++ b/tools_webrtc/ios/internal.client.webrtc/iOS64_Debug.json
@@ -0,0 +1,24 @@
+{
+  "comments": [
+    "Tests for 64-bit iOS devices."
+  ],
+  "xcode version": "8.0",
+  "gn_args": [
+    "goma_dir=\"$(goma_dir)\"",
+    "is_component_build=false",
+    "is_debug=true",
+    "target_cpu=\"x64\"",

[kjellander_webrtc, 2017/06/01 11:35:35]

This should have been arm64 etc. Sorry for missing that - I'll fix in a new CL.

+    "target_os=\"ios\"",
+    "use_goma=true"
+  ],
+  "use_analyze": false,
+  "additional_compile_targets": [ "all" ],
+  "configuration": "Debug",
+  "tests": [
+    {
+      "include": "common_tests.json",
+      "device type": "iPhone 6s",
+      "os": "10.0"
+    }
+  ]
+}