Fix compile warning

src/effects/SkRectShaderImageFilter.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkRectShaderImageFilter.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
@@ skipping 31 matching lines @@
     SkSafeUnref(fShader);
 }
 
 bool SkRectShaderImageFilter::onFilterImage(Proxy* proxy,
                                             const SkBitmap& source,
                                             const SkMatrix&,
                                             SkBitmap* result,
                                             SkIPoint*) {
     SkRect rect(fRect);
     if (rect.isEmpty()) {
-        rect = SkRect::MakeWH(source.width(), source.height());
+        rect = SkRect::MakeWH(SkIntToScalar(source.width()), SkIntToScalar(source.height()));
     }
 
     if (rect.isEmpty()) {
         return false;
     }
 
     SkAutoTUnref<SkDevice> device(proxy->createDevice(SkScalarCeilToInt(rect.width()),
                                                       SkScalarCeilToInt(rect.height())));
     SkCanvas canvas(device.get());
     SkPaint paint;
     paint.setShader(fShader);
     canvas.drawRect(rect, paint);
     *result = device.get()->accessBitmap(false);
     return true;
 }