Add effects/core.gypi to 'sources' to make them appear in VS projects

Review URL: https://codereview.appspot.com/6493075/



git-svn-id: http://skia.googlecode.com/svn/trunk@5384 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/gpu.gyp b/gyp/gpu.gyp
index 172f84e..10f1a80 100644
--- a/gyp/gpu.gyp
+++ b/gyp/gpu.gyp
@@ -133,7 +133,7 @@
         '<@(skgr_mesa_gl_sources)',
         '<@(skgr_debug_gl_sources)',
         '<@(skgr_null_gl_sources)',
-        'gpu.gypi',
+        'gpu.gypi', # Makes the gypi appear in IDEs (but does not modify the build).
       ],
       'conditions': [
         [ 'not skia_mesa', {
@@ -181,7 +181,7 @@
         '<@(gr_mesa_gl_sources)',
         '<@(gr_debug_gl_sources)',
         '<@(gr_null_gl_sources)',
-        'gpu.gypi',
+        'gpu.gypi', # Makes the gypi appear in IDEs (but does not modify the build).
       ],
       'defines': [
         'GR_IMPLEMENTATION=1',