Support accessibility for battery chart (2)

Support virtual accessbility children in battery usage chart.

Please see the following screen record with sound:
VoiceAccess by name: https://drive.google.com/file/d/15pEEU0OJsyCRbqR4nkALlIgHue4KVEvL/view?usp=sharing&resourcekey=0-ed-u-IWSDlODiYyJIEmVng
VoiceAccess by number: https://drive.google.com/file/d/1mBNjbpPGsw4nYU_krG8283RVPaYGZMO3/view?usp=sharing&resourcekey=0-3aIhbcCzJuEpsbDkaPAcWg
SwitchAccess: https://drive.google.com/file/d/1rr8sHMGCbP0kglsp7rWwOVQV5kcgEZHa/view?usp=sharing&resourcekey=0-GW2525dHtzDWvzS2uhu8Yg
TalkBack: https://drive.google.com/file/d/1daxwHQE3BwySuSIptvO9wCJwnjVehsLE/view?usp=sharing&resourcekey=0-DWo0TuhAfz_9Qaf9_orIWA
MouseConnected: https://drive.google.com/file/d/1DzJq5tJsNneNsRbRIZptXfK1l_wR0Kdz/view?usp=sharing&resourcekey=0-npq7ekR1glpofEKMRcJzFQ

The following is the orignal broken behaviors:
Original VoiceAccess: https://drive.google.com/file/d/1FtQJoVVWnq2xZyUaxW5_h1o0y7jTm9zd/view?usp=sharing&resourcekey=0-BVfk0nzpC2RSx9vGKmfogQ
Original TalkBack: https://drive.google.com/file/d/1jMuDo8Lu0uGRSm3OWVBCbm7lXVJnpMn4/view?usp=sharing&resourcekey=0-ozUs4bN14fMPrbvHUtogpw

Bug: 242989585
Fix: 242989585
Test: manual
Change-Id: I18fe63f75c2438e80b244050608a7ccb2b52c37b