1. Set null content description for all labels of the chart.
2. Set 2 parts in the content description of the chart:
I. Brief description of the chart.
II. Stats of the data usage.
Bug: 141093026
Test: ChartDataUsagePreferenceTest
Manually listen to TalkBack speaking
Change-Id: I82cefd9987793f40a5bba5bf3ea5f4017da37640
Flips the canvas horizontally before drawing paths under RTL mode.
Bug: 78008951
Test: manually verified graphs of wifi data usage, app data usage, and
battery usage.
Change-Id: I79286e9f3f98632e3a9710d42c3e197231a14c39
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