cc: disable denorm handling before calling into Skia's filter code.

cc/base/math_util.h

 // Copyright 2012 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.
 
 #ifndef CC_BASE_MATH_UTIL_H_
 #define CC_BASE_MATH_UTIL_H_
 
 #include <algorithm>
 #include <cmath>
 #include <memory>
@@ skipping 305 matching lines @@
     return (n > 0) ? ((n + mul - 1) / mul) * mul : (n / mul) * mul;
   }
 
   template <typename T>
   static T RoundDownInternal(T n, T mul) {
     return (n > 0) ? (n / mul) * mul : (n == 0) ? 0
                                                 : ((n - mul + 1) / mul) * mul;
   }
 };
 
+class ScopedSubnormalFloatDisabler {
+ public:
+  ScopedSubnormalFloatDisabler();
+  ~ScopedSubnormalFloatDisabler();
+
+ private:
+#ifdef __SSE__
+  unsigned int orig_state_;
+#endif
+  DISALLOW_COPY_AND_ASSIGN(ScopedSubnormalFloatDisabler);
+};
+
 }  // namespace cc
 
 #endif  // CC_BASE_MATH_UTIL_H_