Reset clip in ~SkGpuDevice

https://codereview.appspot.com/6763044/



git-svn-id: http://skia.googlecode.com/svn/trunk@6070 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index dadb9a0..52d26bb 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -256,6 +256,10 @@
         fContext->setRenderTarget(NULL);
     }
 
+    if (fContext->getClip() == &fClipData) {
+        fContext->setClip(NULL);
+    }
+
     SkSafeUnref(fRenderTarget);
     fContext->unref();
 }