Consolidate shortcut usage report api.

In S, to simplify shortcut usage report, calling pushDynamicShortcut now
leads to usage report so that developer only needs to deal with one api.

Bug: 151359749
Test: atest ShortcutManagerTest1 ShortcutManagerTest2
ShortcutManagerTest3 ShortcutManagerTest4 ShortcutManagerTest5
ShortcutManagerTest6 ShortcutManagerTest7 ShortcutManagerTest8
ShortcutManagerTest9 ShortcutManagerTest10 ShortcutManagerTest11
Test: atest CtsShortcutManagerTestCases

Change-Id: Ib7b0de0c8343475c2e09078240a87f9b29d55880