Fix imagemagnifier GM quality and speed.

gm/imagemagnifier.cpp

Index: gm/imagemagnifier.cpp
diff --git a/gm/imagemagnifier.cpp b/gm/imagemagnifier.cpp
index e2847b4c67312707b5aa1110a3b87986702a877a..371b3088f9e57c378e811183cd0745c5910c88b2 100644
--- a/gm/imagemagnifier.cpp
+++ b/gm/imagemagnifier.cpp
@@ -35,23 +35,24 @@ protected:
     }
 
     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
-        SkPaint paint;
-        paint.setImageFilter(
+        SkPaint filterPaint;
+        filterPaint.setImageFilter(
             SkMagnifierImageFilter::Create(
                 SkRect::MakeXYWH(SkIntToScalar(100), SkIntToScalar(100),
                                  SkIntToScalar(WIDTH / 2),
                                  SkIntToScalar(HEIGHT / 2)),
                 100))->unref();
-        canvas->saveLayer(NULL, &paint);
-        paint.setAntiAlias(true);
-        sk_tool_utils::set_portable_typeface(&paint);
+        canvas->saveLayer(NULL, &filterPaint);
         const char* str = "The quick brown fox jumped over the lazy dog.";
         SkRandom rand;
         for (int i = 0; i < 25; ++i) {
             int x = rand.nextULessThan(WIDTH);
             int y = rand.nextULessThan(HEIGHT);
+            SkPaint paint;
+            sk_tool_utils::set_portable_typeface(&paint);
             paint.setColor(rand.nextBits(24) | 0xFF000000);
             paint.setTextSize(rand.nextRangeScalar(0, 300));
+            paint.setAntiAlias(true);
             canvas->drawText(str, strlen(str), SkIntToScalar(x),
                              SkIntToScalar(y), paint);
         }