Fix some fixed-point bugs.

Review URL: https://codereview.appspot.com/6047046

git-svn-id: http://skia.googlecode.com/svn/trunk@3714 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/shaderbounds.cpp b/gm/shaderbounds.cpp
index ee08ce6..9529151 100644
--- a/gm/shaderbounds.cpp
+++ b/gm/shaderbounds.cpp
@@ -78,8 +78,8 @@
         if (background) {
             scale = SkFloatToScalar(0.6f);
         }
-        SkScalar shaderWidth = SkIntToScalar(width)/scale;
-        SkScalar shaderHeight = SkIntToScalar(height)/scale;
+        SkScalar shaderWidth = SkScalarDiv(SkIntToScalar(width), scale);
+        SkScalar shaderHeight = SkScalarDiv(SkIntToScalar(height), scale);
         SkShader* shader = fShaderMaker(shaderWidth, shaderHeight, background);
         SkMatrix shaderScale;
         shaderScale.setScale(scale, scale);