SW backend for viewer on Windows

tools/viewer/sk_app/WindowContext.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef WindowContext_DEFINED
 #define WindowContext_DEFINED
 
 #include "DisplayParams.h"
@@ skipping 13 matching lines @@
                     , fSurfaceProps(SkSurfaceProps::kLegacyFontHost_InitType) {}
 
     virtual ~WindowContext() {}
 
     virtual sk_sp<SkSurface> getBackbufferSurface() = 0;
 
     virtual void swapBuffers() = 0;
 
     virtual bool isValid() = 0;
 
-    virtual void resize(uint32_t w, uint32_t h) = 0;
+    virtual void resize(int w, int h) = 0;
 
     const DisplayParams& getDisplayParams() { return fDisplayParams; }
     virtual void setDisplayParams(const DisplayParams& params) = 0;
 
     SkSurfaceProps getSurfaceProps() const { return fSurfaceProps; }
     void setSurfaceProps(const SkSurfaceProps& props) {
         fSurfaceProps = props;
     }
 
     virtual GrBackendContext getBackendContext() = 0;
@@ skipping 17 matching lines @@
     SkSurfaceProps    fSurfaceProps;
 
 private:
     sk_sp<SkSurface> createSurface(
             GrBackendRenderTargetDesc*, int colorBits, bool offscreen, bool forceSRGB);
 };
 
 }   // namespace sk_app
 
 #endif