add SkAnimTimer, SPACE = pause/resume, ESP = stop

gm/addarc.cpp

Index: gm/addarc.cpp
diff --git a/gm/addarc.cpp b/gm/addarc.cpp
index 1386cdd0e78e6a2c985f0b20cdc8c6f2d247b61a..e6fad25772db27b6a8ca642b3885ca2c14a12981 100644
--- a/gm/addarc.cpp
+++ b/gm/addarc.cpp
@@ -6,6 +6,7 @@
  */
 
 #include "gm.h"
+#include "SkAnimTimer.h"
 #include "SkCanvas.h"
 #include "SkRandom.h"
 
@@ -49,8 +50,8 @@ protected:
         }
     }
 
-    bool onAnimatePulse(SkMSec curr, SkMSec prev) SK_OVERRIDE {
-        fRotate = SkDoubleToScalar(fmod(curr * 0.001, 360));
+    bool onAnimate(const SkAnimTimer& timer) SK_OVERRIDE {
+        fRotate = timer.scaled(1, 360);
         return true;
     }