Sync Framework from Jetpack.

Included changes:
* ebd84f: Further fixes and improvements to export script.
* 968bbd: Copy AppSearchSession, GlobalSearchSession and SearchResults into shims.
* a0d314: Refactor tests involving AppSearchSession into base and concrete class.
* 8d652e: Remove spam logs from GenericDocument.
* 11e8f8: Update AppSearch to be in sync google3 update aosp/1541514.
* cdd6f7: Add package name to SearchResult.

Bug: 176519441
Bug: 175801531
Bug: 174614009
Bug: 169883602
Test: Presubmit
Change-Id: I4cf2d830294b41909b6d41adb7925ddebc1d01eb