Allow debugger to be compiled without Ganesh

https://codereview.appspot.com/7311084/



git-svn-id: http://skia.googlecode.com/svn/trunk@7710 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/debugger/QT/SkGLWidget.h b/debugger/QT/SkGLWidget.h
index 2a60c9a..ccbb1ee 100644
--- a/debugger/QT/SkGLWidget.h
+++ b/debugger/QT/SkGLWidget.h
@@ -10,12 +10,13 @@
 #ifndef SKGLWIDGET_H_
 #define SKGLWIDGET_H_
 
+#if SK_SUPPORT_GPU
+
 #include <QtOpenGL/QGLWidget>
 #include "SkDebugCanvas.h"
 #include "SkDebugger.h"
 #include "SkDevice.h"
 #include "SkGpuDevice.h"
-
 #include "GrContext.h"
 #include "gl/GrGLInterface.h"
 #include "gl/GrGLUtil.h"
@@ -51,4 +52,6 @@
     GrBackendRenderTargetDesc getDesc(int w, int h);
 };
 
+#endif /* SK_SUPPORT_GPU */
+
 #endif /* SKGLWIDGET_H_ */