Add gfx::ToRoundedInt safe conversion method from float to int.

ui/gfx/safe_integer_conversions.h

Index: ui/gfx/safe_integer_conversions.h
diff --git a/ui/gfx/safe_floor_ceil.h b/ui/gfx/safe_integer_conversions.h
similarity index 65%
rename from ui/gfx/safe_floor_ceil.h
rename to ui/gfx/safe_integer_conversions.h
index c2d80c6406397c553cb416338cb1c9cea12cbaa8..2c22aa70d9899b5716e01af8460bb8563de765e7 100644
--- a/ui/gfx/safe_floor_ceil.h
+++ b/ui/gfx/safe_integer_conversions.h
@@ -2,15 +2,16 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef UI_GFX_SAFE_FLOOR_CEIL_H_
-#define UI_GFX_SAFE_FLOOR_CEIL_H_
+#ifndef UI_GFX_SAFE_INTEGER_CONVERSIONS_H_
+#define UI_GFX_SAFE_INTEGER_CONVERSIONS_H_
 
 namespace gfx {
 
 UI_EXPORT int ClampToInt(float value);

[tfarina, 2012/10/10 00:29:44]

is it worth adding unittests for these functions? 

[tfarina, 2012/10/10 00:29:44]

missing the include to ui/base/ui_export.h

[danakj, 2012/10/10 00:31:35]

Done.

[danakj, 2012/10/10 00:31:35]

I think the likelihood these functions will regress is marginal.

 UI_EXPORT int ToFlooredInt(float value);
 UI_EXPORT int ToCeiledInt(float value);
+UI_EXPORT int ToRoundedInt(float value);
 
 }  // namespace gfx
 
-#endif  // UI_GFX_SAFE_FLOOR_CEIL_H_
+#endif  // UI_GFX_SAFE_INTEGER_CONVERSIONS_H_