disable GM that asserts on gpu

BUG=skia:3265

TBR=egdaniel@google.com
NOTRY=true
NOTREECHECKS=true

Review URL: https://codereview.chromium.org/818743002
diff --git a/gm/complexclip3.cpp b/gm/complexclip3.cpp
index bae5c5a..1cea1ce 100644
--- a/gm/complexclip3.cpp
+++ b/gm/complexclip3.cpp
@@ -22,7 +22,7 @@
 
 protected:
     uint32_t onGetFlags() const SK_OVERRIDE {
-        return kSkipTiled_Flag;
+        return kSkipTiled_Flag | kSkipGPU_Flag;
     }
 
     SkString onShortName() {