disable GPU blur on small paths

Change originally by Guanqun.Lu@gmail.com with minor edits and sample added by me

COULD POSSIBLY CHANGE GPU RESULTS OF GM SLIDES WITH BLUR, WILL REBASILINE IF SO.

Review URL: https://codereview.appspot.com/5940045/



git-svn-id: http://skia.googlecode.com/svn/trunk@3514 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleCode.h b/samplecode/SampleCode.h
index 197e0f1..3d1f266 100644
--- a/samplecode/SampleCode.h
+++ b/samplecode/SampleCode.h
@@ -35,6 +35,10 @@
     static SkMSec GetAnimTimeDelta();
     static SkScalar GetAnimSecondsDelta();
     static SkScalar GetAnimScalar(SkScalar speedPerSec, SkScalar period = 0);
+    // gives a sinusoidal value between 0 and amplitude
+    static SkScalar GetAnimSinScalar(SkScalar amplitude,
+                                     SkScalar periodInSec,
+                                     SkScalar phaseInSec = 0);
 
     static GrContext* GetGr();
 };