Quick fix for SDF sample.
Quick fix for SDF sample.

- A simple layout fix to left aligned makes the sample look better when
  zooming texts.
- Still needs to evaluate better method to scale layout efficiently.

Change-Id: I2dda54e3a94aa8263a2c88450c2156002eb2c916

google/flatui,google/flatui,google/flatui,google/flatui