GridTileBar doesn't seem to respect Material design's spec

[Pacane]

Steps to Reproduce

• Go to Flutter Gallery
• Go to Grid Demo
• (Keep the default "Two Lines")

Expected : All bars should have the same height
Actual: There's a small difference in height between the bottom bars in the tiles "Mountain country" and "Alpine place".

If you want to make it even more visible:

• Change the demo to be "One line"
  Expected : All bars should have the same height
  Actual: There's a big difference in height between the bottom bars in the tiles "Desert land" and "Narnia".

Note: See the specs for specific measurements.

Logs

N/A

Flutter Doctor

 ❯ flutter doctor                                                                                                                                                                                                        [15:27:09]
[✓] Flutter (on Linux, channel master)
    • Flutter at /home/joel/code/flutter
    • Framework revision c1f817dfa1 (3 hours ago), 2016-11-13 12:30:48
    • Engine revision 84a060820a
    • Tools Dart version 1.21.0-dev.3.0

[✓] Android toolchain - develop for Android devices (Android SDK 25.0.0)
    • Android SDK at /opt/android-sdk
    • Platform android-25, build-tools 25.0.0
    • ANDROID_HOME = /opt/android-sdk
    • Java(TM) SE Runtime Environment (build 1.8.0_112-b15)

[✓] IntelliJ IDEA Ultimate Edition (version 2016.3)
    • Dart plugin installed
    • Flutter plugin installed

[✓] Connected devices
    • Nexus 6P • 84B7N15A10004400 • android-arm • Android 7.1.1 (API 25)

[HansMuller]

Thanks for the report, will fix!

[github-actions]

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