Don't unnecessarily resize windows in sk_app on X

tools/viewer/sk_app/Window.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 Window_DEFINED
 #define Window_DEFINED
 
@@ skipping 140 matching lines @@
     }
 
     bool onChar(SkUnichar c, uint32_t modifiers);
     bool onKey(Key key, InputState state, uint32_t modifiers);
     bool onMouse(int x, int y, InputState state, uint32_t modifiers);
     bool onTouch(intptr_t owner, InputState state, float x, float y);  // multi-owner = multi-touch
     void onUIStateChanged(const SkString& stateName, const SkString& stateValue);
     void onPaint();
     void onResize(uint32_t width, uint32_t height);
 
-    uint32_t width() { return fWidth; }
-    uint32_t height() { return fHeight;  }
+    int width() { return fWidth; }
+    int height() { return fHeight;  }
 
     virtual const DisplayParams& getDisplayParams();
     void setDisplayParams(const DisplayParams& params);
 
     // This is just for the sRGB split screen
     sk_sp<SkSurface> getOffscreenSurface(bool forceSRGB);
 
 protected:
     Window();
 
-    uint32_t     fWidth;
-    uint32_t     fHeight;
+    int          fWidth;
+    int          fHeight;
 
     OnCharFunc   fCharFunc;
     void*        fCharUserData;
     OnKeyFunc    fKeyFunc;
     void*        fKeyUserData;
     OnMouseFunc  fMouseFunc;
     void*        fMouseUserData;
     OnTouchFunc  fTouchFunc;
     void*        fTouchUserData;
     OnUIStateChangedFunc
                  fUIStateChangedFunc;
     void*        fUIStateChangedUserData;
     OnPaintFunc  fPaintFunc;
     void*        fPaintUserData;
 
     WindowContext* fWindowContext = nullptr;
 
     virtual void onInval() = 0;
 
     // Uncheck fIsContentInvalided to allow future inval/onInval.
     void markInvalProcessed();
 
     bool fIsContentInvalidated = false;  // use this to avoid duplicate invalidate events
 };
 
 }   // namespace sk_app
 #endif