Fix SkWindow.cpp includes for non-gpu mode

TBR=bungeman@google.com

Review URL: https://codereview.chromium.org/1400933002 .
diff --git a/src/views/SkWindow.cpp b/src/views/SkWindow.cpp
index 7f9b683..d93bc96 100644
--- a/src/views/SkWindow.cpp
+++ b/src/views/SkWindow.cpp
@@ -6,7 +6,6 @@
  */
 
 #include "SkWindow.h"
-#include "GrContext.h"
 #include "SkCanvas.h"
 #include "SkOSMenu.h"
 #include "SkSurface.h"
@@ -317,6 +316,7 @@
 
 #if SK_SUPPORT_GPU
 
+#include "GrContext.h"
 #include "gl/GrGLInterface.h"
 #include "gl/GrGLUtil.h"
 #include "SkGr.h"