Add chromium_code: 1 to surface.gyp and gl.gyp to pick up -Werror.

ui/gfx/surface/surface.gyp

Index: ui/gfx/surface/surface.gyp
diff --git a/ui/gfx/surface/surface.gyp b/ui/gfx/surface/surface.gyp
index 960e14845d9ce5a1a23f48ae799eb93003d3c2c2..a4e0122c42ac9e8e4f5c5315b1813cc16cb0b1e2 100644
--- a/ui/gfx/surface/surface.gyp
+++ b/ui/gfx/surface/surface.gyp
@@ -3,37 +3,17 @@
 # found in the LICENSE file.
 
 {
+  'variables': {
+    'chromium_code': 1,
+  },
+
   'target_defaults': {
-    'sources/': [
-      ['exclude', '/(cocoa|gtk|win)/'],
-      ['exclude', '_(cocoa|gtk|linux|mac|posix|win|x)\\.(cc|mm?)$'],
-      ['exclude', '/(gtk|win|x11)_[^/]*\\.cc$'],
-    ],
     'conditions': [
       ['toolkit_uses_gtk == 1', {
-        'sources/': [
-          ['include', '/gtk/'],
-          ['include', '_(gtk|linux|posix|skia|x)\\.cc$'],
-          ['include', '/(gtk|x11)_[^/]*\\.cc$'],
-        ],
         'include_dirs': [
           '<(DEPTH)/third_party/angle/include',
         ],
       }],
-      ['OS=="mac"', {'sources/': [
-        ['include', '/cocoa/'],
-        ['include', '_(cocoa|mac|posix)\\.(cc|mm?)$'],
-      ]}, { # else: OS != "mac"
-        'sources/': [
-          ['exclude', '\\.mm?$'],
-        ],
-      }],
-      ['OS=="win"',
-        {'sources/': [
-          ['include', '_(win)\\.cc$'],
-          ['include', '/win/'],
-          ['include', '/win_[^/]*\\.cc$'],
-      ]}],
     ],
   },
   'targets': [