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/samplecode/SampleApp.cpp b/samplecode/SampleApp.cpp
index 898bda0..d40a670 100644
--- a/samplecode/SampleApp.cpp
+++ b/samplecode/SampleApp.cpp
@@ -22,7 +22,7 @@
 #include "GrContext.h"
 #include "SkTypeface.h"
 
-#include "GrGLInterface.h"
+#include "gl/GrGLInterface.h"
 #include "GrRenderTarget.h"
 
 #include "SkPDFDevice.h"