Add header needed to use the SWAP_PER_DRAW debug facility on windows.
git-svn-id: http://skia.googlecode.com/svn/trunk@4327 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/gl/GrGpuGL.cpp b/src/gpu/gl/GrGpuGL.cpp
index 5b03500..2662f8e 100644
--- a/src/gpu/gl/GrGpuGL.cpp
+++ b/src/gpu/gl/GrGpuGL.cpp
@@ -1658,6 +1658,7 @@
#if GR_MAC_BUILD
#include <AGL/agl.h>
#elif GR_WIN32_BUILD
+ #include <gl/GL.h>
void SwapBuf() {
DWORD procID = GetCurrentProcessId();
HWND hwnd = GetTopWindow(GetDesktopWindow());