Smart sampling for geometric inputs.

Gesture:
+1     227
-1     131
+2       0
-2       0
+3       0
-3       0
+4     261
-4     167
+5      73
-5     263
+6       0
-6       0
+7       0
-7       0
Gesture incremental:
+1     228
-1     127
+2       0
-2       0
+3       0
-3       0
+4     269
-4     167
+5      68
-5     271
+6       0
-6       0
+7       0
-7       0

On device:
0: all, 1:initialize

(0)  56285.82 (99.99%)
(1)  3886.59 (6.90%)
->
(0)  42795.78 (99.98%)
(1)  3916.80 (9.15%)

Change-Id: I3eed99cbd75b22fd2d8b5404a4f7e0972f284a85