Remove implicit flooring Scale() method from Point and Size.

ui/gfx/canvas.cc

Index: ui/gfx/canvas.cc
diff --git a/ui/gfx/canvas.cc b/ui/gfx/canvas.cc
index c4f98d68b515ba3cdbaae7ffe42631966f044584..78badf1694873acfc852b5d1b42b633e6a1371be 100644
--- a/ui/gfx/canvas.cc
+++ b/ui/gfx/canvas.cc
@@ -13,6 +13,7 @@
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/font.h"
 #include "ui/gfx/rect.h"
+#include "ui/gfx/size_conversions.h"
 #include "ui/gfx/skia_util.h"
 #include "ui/gfx/transform.h"
 
@@ -28,7 +29,8 @@ Canvas::Canvas(const gfx::Size& size,
       : scale_factor_(scale_factor),
         owned_canvas_(NULL),
         canvas_(NULL) {
-  gfx::Size pixel_size = size.Scale(ui::GetScaleFactorScale(scale_factor));
+  gfx::Size pixel_size = gfx::ToFlooredSize(size.Scale(
+      ui::GetScaleFactorScale(scale_factor)));
   owned_canvas_.reset(new skia::PlatformCanvas(pixel_size.width(),
                                                pixel_size.height(),
                                                is_opaque));
@@ -74,7 +76,8 @@ void Canvas::RecreateBackingCanvas(const gfx::Size& size,
                                    ui::ScaleFactor scale_factor,
                                    bool is_opaque) {
   scale_factor_ = scale_factor;
-  gfx::Size pixel_size = size.Scale(ui::GetScaleFactorScale(scale_factor));
+  gfx::Size pixel_size = gfx::ToFlooredSize(
+      size.Scale(ui::GetScaleFactorScale(scale_factor)));
   owned_canvas_.reset(new skia::PlatformCanvas(pixel_size.width(),
                                                pixel_size.height(),
                                                is_opaque));