Don't unnecessarily resize windows in sk_app on X

tools/viewer/sk_app/unix/Window_unix.h

Index: tools/viewer/sk_app/unix/Window_unix.h
diff --git a/tools/viewer/sk_app/unix/Window_unix.h b/tools/viewer/sk_app/unix/Window_unix.h
index fb6b22d4132a4e09ed056528bc6b298cb2588e84..b6d40e69dbda855db5afe579ec0dde4899d793ab 100644
--- a/tools/viewer/sk_app/unix/Window_unix.h
+++ b/tools/viewer/sk_app/unix/Window_unix.h
@@ -63,10 +63,12 @@ public:
         }
     }
 
-    void markPendingResize(int width, int height) { 
-        fPendingWidth = width; 
-        fPendingHeight = height;
-        fPendingResize = true;
+    void markPendingResize(int width, int height) {
+        if (width != fWidth || height != fHeight){
+            fPendingResize = true;
+            fPendingWidth = width;
+            fPendingHeight = height;
+        }
     }
     void finishResize() { 
         if (fPendingResize) {