Avoid overflow when checking if a transform is integer translation.

ui/gfx/transform_unittest.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // MSVC++ requires this to be set before any other includes to get M_PI.
 #define _USE_MATH_DEFINES
 
 #include "ui/gfx/transform.h"
 
 #include <stddef.h>
@@ skipping 1327 matching lines @@
   transform.Translate3d(4.5f, 0, 0);
   EXPECT_FALSE(transform.IsIdentityOrIntegerTranslation());
 
   transform.MakeIdentity();
   transform.Translate3d(0, -6.7f, 0);
   EXPECT_FALSE(transform.IsIdentityOrIntegerTranslation());
 
   transform.MakeIdentity();
   transform.Translate3d(0, 0, 8.9f);
   EXPECT_FALSE(transform.IsIdentityOrIntegerTranslation());
+
+  float max_int = std::numeric_limits<int>::max();
+  transform.MakeIdentity();
+  transform.Translate3d(0, 0, max_int + 1000.5f);
+  EXPECT_FALSE(transform.IsIdentityOrIntegerTranslation());
+
+  float max_float = std::numeric_limits<float>::max();
+  transform.MakeIdentity();
+  transform.Translate3d(0, 0, max_float - 0.5f);
+  EXPECT_FALSE(transform.IsIdentityOrIntegerTranslation());
 }
 
 TEST(XFormTest, verifyMatrixInversion) {
   {
     // Invert a translation
     gfx::Transform translation;
     translation.Translate3d(2.0, 3.0, 4.0);
     EXPECT_TRUE(translation.IsInvertible());
 
     gfx::Transform inverse_translation;
@@ skipping 1359 matching lines @@
   EXPECT_FALSE(backface_invisible.IsBackFaceVisible());
 
   // A noise that is more than the tolerance should change the result.
   backface_invisible.matrix().set(0, 3, 1.f + (2 * noise));
   EXPECT_TRUE(backface_invisible.IsBackFaceVisible());
 }
 
 }  // namespace
 
 }  // namespace gfx