Move GL-specific include files to their own subdirectory, to better
coexist alongside D3D backend.
Requires gyp change.

http://codereview.appspot.com/5665045/



git-svn-id: http://skia.googlecode.com/svn/trunk@3185 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/gl/SkNullGLContext.cpp b/src/gpu/gl/SkNullGLContext.cpp
index 04e63d8..86c09b2 100644
--- a/src/gpu/gl/SkNullGLContext.cpp
+++ b/src/gpu/gl/SkNullGLContext.cpp
@@ -6,7 +6,7 @@
  * found in the LICENSE file.
  */
 
-#include "SkNullGLContext.h"
+#include "gl/SkNullGLContext.h"
 
 const GrGLInterface* SkNullGLContext::createGLContext() {
     return GrGLCreateNullInterface();