try to speed-up maprect + round2i + contains

tests/RectTest.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkRect.h"
@@ skipping 70 matching lines @@
     paint.setColor(0xff000000);
     paint.setStrokeWidth(0.99f);
     canvas.drawRect(r, paint);
     REPORTER_ASSERT(reporter, has_green_pixels(bm));
 }
 
 DEF_TEST(Rect, reporter) {
     test_stroke_width_clipping(reporter);
     test_skbug4406(reporter);
 }
+
+DEF_TEST(Rect_round, reporter) {
+    SkRandom rand;
+
+    for (int i = 0; i < 100000; ++i) {
+        SkRect src = SkRect::MakeXYWH(rand.nextSScalar1() * 1000,
+                                      rand.nextSScalar1() * 1000,
+                                      rand.nextUScalar1() * 1000,
+                                      rand.nextUScalar1() * 1000);
+        SkRect rd0 = {
+            SkScalarRoundToScalar(src.fLeft),
+            SkScalarRoundToScalar(src.fTop),
+            SkScalarRoundToScalar(src.fRight),
+            SkScalarRoundToScalar(src.fBottom)
+        };
+        SkRect rd1 = src.round2s();
+
+        REPORTER_ASSERT(reporter, rd0 == rd1);
+
+        SkIRect ir0 = {
+            SkScalarRoundToInt(src.fLeft),
+            SkScalarRoundToInt(src.fTop),
+            SkScalarRoundToInt(src.fRight),
+            SkScalarRoundToInt(src.fBottom)
+        };
+        SkIRect ir1 = src.round();
+        SkIRect ir2 = src.round2i();
+
+        REPORTER_ASSERT(reporter, ir0 == ir1);
+        REPORTER_ASSERT(reporter, ir0 == ir2);
+    }
+}