systrace label for silk

add vsync trace timer
Add systrace labels

1. HwToVsync            [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. RD_Latency           [silk.r.lat]
10. IPC                 [silk.ipc]