Add the "mfpmath=sse" compiler flag for ChromeOS devices.

build/common.gypi

 # Copyright (c) 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 2969 matching lines @@
                       '-mfpmath=sse',
                     ],
                   }],
                   # ChromeOS targets Pinetrail, which is sse3, but most of the
                   # benefit comes from sse2 so this setting allows ChromeOS
                   # to build on other CPUs.  In the future -march=atom would
                   # help but requires a newer compiler.
                   ['chromeos==1 and disable_sse2==0', {
                     'cflags': [
                       '-msse2',
+                      '-mfpmath=sse',
                     ],
                   }],
                   # Use gold linker for Android ia32 target.
                   ['OS=="android"', {
                     'cflags': [
                       '-fuse-ld=gold',
                     ],
                     'ldflags': [
                       '-fuse-ld=gold',
                     ],
@@ skipping 1707 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }