Collect NeededUriGrants without holding locks.

In preparation for a future security fix, we need to determine Uri
permission grants before acquiring the WM lock.  This CL is mostly
mechanical refactoring to split the calculation and granting logic
into two phases, and pass around the calculated NeededUriGrants.

There is no other logic changes included in this CL, so it should
have no effects.

Bug: 115619667
Test: atest WmTests:ActivityStarterTests
Test: atest FrameworksServicesTests:com.android.server.uri
Test: atest CtsAppSecurityHostTestCases:android.appsecurity.cts.AppSecurityTests#testPermissionDiffCert
Test: atest CtsWindowManagerDeviceTestCases:CrossAppDragAndDropTests
Test: atest CtsWindowManagerDeviceTestCases:ActivityStarterTests
Change-Id: I07f331a53e27ae5c9d4bade50d70544d02bcd7b1