skia: Add support for ANGLE on linux

gyp/common_conditions.gypi

Index: gyp/common_conditions.gypi
diff --git a/gyp/common_conditions.gypi b/gyp/common_conditions.gypi
index 44220a3bfd8e6834542231d2935c397cf4060681..ad3ad1ce7c4e22d666bc22ae75daf1f5849b987e 100644
--- a/gyp/common_conditions.gypi
+++ b/gyp/common_conditions.gypi
@@ -250,6 +250,17 @@
                   '-m32',
                 ],
               }],
+              [ 'skia_angle == 1' , {
+                'cflags!': [
+                  '-fstrict-aliasing',

[mtklein, 2015/09/21 13:02:57]

Can we not just turn off this stuff for ANGLE?  Anything in this file is global.

+                ],
+                'cflags_cc!': [
+                  '-Wnon-virtual-dtor',
+                ],
+                'cflags_cc': [
+                  '-Wunknown-pragmas -Wno-error=unknown-pragmas',
+                ],
+              }],
             ],
           }],
           [ 'skia_warnings_as_errors', {