Clean up test drawContext usage

src/gpu/SkGpuDevice.cpp

Index: src/gpu/SkGpuDevice.cpp
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index 78b3cfc7d0efe2930ddfba287baba3659b621d17..0e6eb92537c6794f3f9e8b19e9350a46f6a9d24b 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -347,6 +347,11 @@ GrRenderTarget* SkGpuDevice::accessRenderTarget() {
     return fRenderTarget;
 }
 
+GrDrawContext* SkGpuDevice::accessDrawContext() {
+    ASSERT_SINGLE_OWNER
+    return fDrawContext.get();
+}
+
 void SkGpuDevice::clearAll() {
     ASSERT_SINGLE_OWNER
     GrColor color = 0;