Extract InsetsSourceProvider from WM Trace

Because there is no reliable way to get the actual height of the taskbar from a WM trace, we will instead get the insets applied to the DisplayContent via the InsetsSourceProviders

Bug: 361254713
Test: manually built
Test: flicker test (coming in future CL)
Flag: TEST_ONLY
Change-Id: I28a413b45a004a0ed2c685a3ce258ddbf1b311a8
6 files changed