Fix rounding rules for skia operations to work with non-integer scaling factors.

ui/gfx/canvas.cc

Index: ui/gfx/canvas.cc
diff --git a/ui/gfx/canvas.cc b/ui/gfx/canvas.cc
index 4b4a0f47e3bdc7a3b8a49b00cc85facf19bebb89..134c1453d2e104d7351b7abcd87f08ed215a2b3a 100644
--- a/ui/gfx/canvas.cc
+++ b/ui/gfx/canvas.cc
@@ -28,7 +28,7 @@ Canvas::Canvas(const gfx::Size& size,
                bool is_opaque)
       : scale_factor_(scale_factor),
         canvas_(NULL) {
-  gfx::Size pixel_size = gfx::ToFlooredSize(
+  gfx::Size pixel_size = gfx::ToCeiledSize(
       gfx::ScaleSize(size, ui::GetScaleFactorScale(scale_factor)));
   owned_canvas_ = skia::AdoptRef(skia::CreatePlatformCanvas(pixel_size.width(),
                                                             pixel_size.height(),