Use targetCell[Width|Height] as default widget size.

Test: Created a widget and manually tested the following scenarios
  - targetCell[Width|Height] not specified
  - targetCell[Width|Height] larger than maxResize[Width|Height]
  - targetCell[Width|Height] smaller than minResize[Width|Height]
  - targetCell[Width|Height] within max/min bounds
Bug: 179807199
Change-Id: I55a9dd2f94aa450ba6362301f7ac5ba4ee42f44d
1 file changed