Fix accessBitmap() with deferred clear, GPU path.

src/gpu/SkGpuDevice.cpp

Index: src/gpu/SkGpuDevice.cpp
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index 7d69e620e492077c4d62cbb0c259f05702ea3683..de01953b6708bbb16b6509c8c2884ce8541b955e 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -433,6 +433,11 @@ bool SkGpuDevice::onWritePixels(const SkImageInfo& info, const void* pixels, siz
     return true;
 }
 
+const SkBitmap& SkGpuDevice::onAccessBitmap() {
+    DO_DEFERRED_CLEAR();
+    return INHERITED::onAccessBitmap();
+}
+
 void SkGpuDevice::onAttachToCanvas(SkCanvas* canvas) {
     INHERITED::onAttachToCanvas(canvas);