This CL adds an FYI string under the battery graph to let users
know that their current estimate is coming from the enhanced
estimate provider when it is enabled.
Test: Robotests
Bug: 38399654
Change-Id: If5cd622ef0251a5a483cef870fc2261369e14845
In preparation for modifying the graph code to show detailed projections
(see bug), this change moves it into Settings along with related tests
and resources.
Bug: 38400320
Test: manual, make SettingsUnitTests, make SettingsGoogleUnitTests
Change-Id: I88e5336c15827727b3427e29b10954bba9cfba7d
