Fixed Windows compiler complaints (esp. in debugger)

https://codereview.appspot.com/6497090/



git-svn-id: http://skia.googlecode.com/svn/trunk@5419 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tools/PictureRenderer.cpp b/tools/PictureRenderer.cpp
index 0bc3df1..edbdce9 100644
--- a/tools/PictureRenderer.cpp
+++ b/tools/PictureRenderer.cpp
@@ -251,7 +251,7 @@
             + fTileMinPowerOf2Width;
     }
 
-    int num_bits = SkScalarCeilToInt(SkScalarLog2(fPicture->width()));
+    int num_bits = SkScalarCeilToInt(SkScalarLog2(SkIntToScalar(fPicture->width())));
     int largest_possible_tile_size = 1 << num_bits;
 
     // The tile height is constant for a particular picture.