Build Robolectric with Gradle.
Build Robolectric with Gradle.

Change-Id: I5c820036fc5795e8b2668e191e866fc99eca6938

android-ia/platform_external_robolectric,geekboxzone/lollipop_external_robolectric,android-ia/platform_external_robolectric,geekboxzone/lollipop_external_robolectric,geekboxzone/mmallow_external_robolectric,Omegaphora/external_robolectric,Omegaphora/external_robolectric,geekboxzone/mmallow_external_robolectric,geekboxzone/lollipop_external_robolectric,Omegaphora/external_robolectric,geekboxzone/mmallow_external_robolectric,android-ia/platform_external_robolectric,Omegaphora/external_robolectric,android-ia/platform_external_robolectric,geekboxzone/lollipop_external_robolectric,geekboxzone/mmallow_external_robolectric