Don't purge resources for trivial GrContext flushes
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2298003003
Review-Url: https://codereview.chromium.org/2298003003
diff --git a/src/gpu/GrDrawTarget.h b/src/gpu/GrDrawTarget.h
index 682dd2d..dfc1489 100644
--- a/src/gpu/GrDrawTarget.h
+++ b/src/gpu/GrDrawTarget.h
@@ -96,10 +96,11 @@
void reset();
/**
- * Together these two functions flush all queued up draws to the Gpu.
+ * Together these two functions flush all queued up draws to GrCommandBuffer. The return value
+ * of drawBatches() indicates whether any commands were actually issued to the GPU.
*/
void prepareBatches(GrBatchFlushState* flushState);
- void drawBatches(GrBatchFlushState* flushState);
+ bool drawBatches(GrBatchFlushState* flushState);
/**
* Gets the capabilities of the draw target.