fix warnings

git-svn-id: http://skia.googlecode.com/svn/trunk@1129 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/views/SkWindow.cpp b/src/views/SkWindow.cpp
index 14672e2..db4faee 100644
--- a/src/views/SkWindow.cpp
+++ b/src/views/SkWindow.cpp
@@ -135,7 +135,9 @@
 }
 
 void SkWindow::forceInvalAll() {
-    fDirtyRgn.setRect(0, 0, this->width(), this->height());
+    fDirtyRgn.setRect(0, 0,
+                      SkScalarCeil(this->width()),
+                      SkScalarCeil(this->height()));
 }
 
 #if defined(SK_BUILD_FOR_WINCE) && defined(USE_GX_SCREEN)