Override Bridge.createMockView

The responsability for creating a mock view now falls on layoutlib
through the Bridge.

Bug: 187316741
Test: N/A
Change-Id: Ifa9c90d447ed2631ae43aa7c801c2d36fba0ced7
(cherry picked from commit fb8a00c2ebe1d21e26cca3841ef4ca937c0cf8f3)
1 file changed