Fixing heap corruption issue in deferred canvas when using SkGPipe.

Swapping the declaration order of fPipeController and fPipeWriter to
make sure that the writer is destroyed first before the controller.
Review URL: https://codereview.appspot.com/6427054

git-svn-id: http://skia.googlecode.com/svn/trunk@4682 2bbb7eff-a529-9590-31e7-b0007b416f81

include/utils/SkDeferredCanvas.h

@@ -320,8 +320,8 @@ public:
         void beginRecording();
 
 #if SK_DEFERRED_CANVAS_USES_GPIPE
-        SkGPipeWriter  fPipeWriter;
         DeferredPipeController fPipeController;
+        SkGPipeWriter  fPipeWriter;
 #else
         SkPicture fPicture;
 #endif