fix compilation errors when VISUALIZE_COMPLEX_CLIP is set (debug assist code path)

Review URL: http://codereview.appspot.com/5596043/



git-svn-id: http://skia.googlecode.com/svn/trunk@3100 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrGpu.cpp b/src/gpu/GrGpu.cpp
index 8ee98b7..27a4497 100644
--- a/src/gpu/GrGpu.cpp
+++ b/src/gpu/GrGpu.cpp
@@ -434,7 +434,7 @@
 #if VISUALIZE_COMPLEX_CLIP
     #include "GrRandom.h"
     GrRandom gRandom;
-    #define SET_RANDOM_COLOR this->setColor(0xff000000 | gRandom.nextU());
+    #define SET_RANDOM_COLOR drawState->setColor(0xff000000 | gRandom.nextU());
 #else
     #define SET_RANDOM_COLOR
 #endif