Added mandrill_128.r11.ktx to resources

Review URL: https://codereview.chromium.org/443303005
diff --git a/resources/mandrill_128.r11.ktx b/resources/mandrill_128.r11.ktx
new file mode 100644
index 0000000..932ac4c
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+++ b/resources/mandrill_128.r11.ktx
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