Implement calculations of Responsive Grid in DeviceProfile

When a grid has a responsive spec and the feature flag is on, use the new calculations for the sizes in Workspace. This shouldn't affect Scalable grids.

Fix: 277064708
Test: HomeScreenImageTest
Test: DeviceProfileDumpTest
Test: ResponsiveHomeScreenImageTest
Test: DeviceProfileResponsiveDumpTest
Flag: ENABLE_RESPONSIVE_WORKSPACE
Change-Id: Idef3d17fbfa1b2e0c82c12e7784a7584f1ba1b88