Fix test failure for 32 bit official build.

Official 32 bit builds seem to generate x86 fpu instructions while normal
development settings and Chromium settings generate SSE instructions. GCC has a
loss of precision bug (gcc.gnu.org/PR323) that results in a different floating
point value in some cases. This bug can be worked around by storing the
intermediate value in a variable.

BUG=334475

Review URL: https://codereview.chromium.org/135643006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245343 0039d316-1c4b-4281-b951-d872f2087c98

ui/gfx/animation/tween.cc

@@ -131,10 +131,11 @@ int Tween::IntValueBetween(double value, int start, int target) {
   else
     delta++;
 #if defined(OS_WIN)
-  return start + static_cast<int>(value * _nextafter(delta, 0));
+  value *= _nextafter(delta, 0);
 #else
-  return start + static_cast<int>(value * nextafter(delta, 0));
+  value *= nextafter(delta, 0);
 #endif
+  return start + static_cast<int>(value);
 }
 
 //static