Add systrace labels

1. HwToVsync_latency         [silk.hw2vsync]
2. DispatchVsync             [silk.vd]
3. Input                     [silk.i.scope]
4. Compositor                [silk.c.scope]
5. RefreshDriver             [silk.r.scope]
6. RefreshDriver.client      [silk.r.scope.client]
7. Input_Latency             [silk.i.lat]
8. Comp_Latency              [silk.c.lat]
9. RefreshDriver_Latency     [silk.r.lat]
10. VsyncToRefreshDriver_IPC [silk.ipc]