Break out SSE functions into new media_sse target.

media/media.gyp

Index: media/media.gyp
diff --git a/media/media.gyp b/media/media.gyp
index 526c089fc69df20cf92a165a63d0a70167cfb670..0c992acbbdd36e84f0b0c3b5287e2df364bf8888 100644
--- a/media/media.gyp
+++ b/media/media.gyp
@@ -683,7 +683,7 @@
                   'message': 'Generating Pulse stubs for dynamic loading.',
                 },
               ],
-              'conditions': [ 
+              'conditions': [
                 # Linux/Solaris need libdl for dlopen() and friends.
                 ['OS == "linux" or OS == "solaris"', {
                   'link_settings': {
@@ -811,6 +811,11 @@
             '../build/linux/system.gyp:gtk',
           ],
         }],
+        ['target_arch == "ia32" or target_arch == "x64"', {
+          'dependencies': [
+            'media_sse',
+          ],
+        }],
       ],
       'target_conditions': [
         ['OS == "ios"', {
@@ -1022,6 +1027,9 @@
           'sources': [
             'base/simd/convert_rgb_to_yuv_unittest.cc',
           ],
+          'dependencies': [
+            'media_sse',
+          ],
         }],
         [ 'screen_capture_supported == 0', {
           'sources/': [
@@ -1610,5 +1618,28 @@
         }, # end of target differ_block_sse2
       ],
     }],
+    ['target_arch=="ia32" or target_arch=="x64"', {
+      'targets': [
+        {
+          'target_name': 'media_sse',
+          'type': 'static_library',
+          'conditions': [
+            # OSX already enables SSE2 or higher.

[Mark Mentovai, 2013/03/05 21:32:31]

…and OSX doesn’t use cflags either, so this would be pointless.

[DaleCurtis, 2013/03/05 21:51:37]

Yes! I was irritated that this expression was necessary as it's linking concepts
expressed is other .gyp files.

+            ['OS != "mac"', {
+              'cflags': [
+                '-msse',
+              ],
+            }],
+          ],
+          'include_dirs': [
+            '..',
+          ],
+          'sources': [
+            'base/simd/sinc_resampler_sse.cc',
+            'base/simd/vector_math_sse.cc',
+          ],
+        }, # end of target media_sse
+      ],
+    }],
   ],
 }