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

This is to preventng floating-point computations in the 80-bit precision
on x87. Please see more details in:
http://codereview.chromium.org/42340/patch/64/2085

BUG=261358
TEST=Play videos on Parrot

Review URL: https://chromiumcodereview.appspot.com/23181007

git-svn-id: http://src.chromium.org/svn/trunk/src/build@218068 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -2986,6 +2986,7 @@
                   ['chromeos==1 and disable_sse2==0', {
                     'cflags': [
                       '-msse2',
+                      '-mfpmath=sse',
                     ],
                   }],
                   # Use gold linker for Android ia32 target.