Fix to check for inf when generating quadratic points

gm/conicpaths.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 "gm.h"
 #include "SkCanvas.h"
 #include "SkTArray.h"
@@ skipping 54 matching lines @@
         {
             SkPath* veryThinEllipse = &fPaths.push_back();
             veryThinEllipse->moveTo(0, 0);
             veryThinEllipse->conicTo(100, 100, 1, 0, SK_ScalarHalf);
         }
         {
             SkPath* closedEllipse = &fPaths.push_back();
             closedEllipse->moveTo(0,  0);
             closedEllipse->conicTo(100, 100, 0, 0, SK_ScalarHalf);
         }
+        {
+            const SkScalar w = SkScalarSqrt(2)/2;
+            fGiantCircle.moveTo(2.1e+11f, -1.05e+11f);
+            fGiantCircle.conicTo(2.1e+11f, 0, 1.05e+11f, 0, w);
+            fGiantCircle.conicTo(0, 0, 0, -1.05e+11f, w);
+            fGiantCircle.conicTo(0, -2.1e+11f, 1.05e+11f, -2.1e+11f, w);
+            fGiantCircle.conicTo(2.1e+11f, -2.1e+11f, 2.1e+11f, -1.05e+11f, w);
+
+        }
+    }
+
+    void drawGiantCircle(SkCanvas* canvas) {
+        SkPaint paint;
+        canvas->drawPath(fGiantCircle, paint);
     }
 
     void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         const SkAlpha kAlphaValue[] = { 0xFF, 0x40 };
 
         const SkScalar margin = 15;
         canvas->translate(margin, margin);
 
         SkPaint paint;
         for (int p = 0; p < fPaths.count(); ++p) {
@@ skipping 12 matching lines @@
                         canvas->restore();
 
                         canvas->translate(110, 0);
                     }
                 }
             }
             canvas->restore();
             canvas->translate(0, 110);
         }
         canvas->restore();
+
+        this->drawGiantCircle(canvas);  
     }
 
 private:
     SkTArray<SkPath> fPaths;
+    SkPath           fGiantCircle;
     typedef skiagm::GM INHERITED;
 };
 DEF_GM( return SkNEW(ConicPathsGM); )
 
 //////////////////////////////////////////////////////////////////////////////