DM: print cache stats after every GPU GM when GR_CACHE_STATS is set

dm/DMGpuTask.cpp

Index: dm/DMGpuTask.cpp
diff --git a/dm/DMGpuTask.cpp b/dm/DMGpuTask.cpp
index 2aceb02b8ae01980f862b859acbfa525017a36fb..4d99356237b3188b472058b018911afc1df0873a 100644
--- a/dm/DMGpuTask.cpp
+++ b/dm/DMGpuTask.cpp
@@ -56,6 +56,10 @@ void GpuTask::draw() {
     bitmap.setConfig(fConfig, SkScalarCeilToInt(fGM->width()), SkScalarCeilToInt(fGM->height()));
     canvas.readPixels(&bitmap, 0, 0);
 
+#if GR_CACHE_STATS
+    gr->printCacheStats();
+#endif
+
     // We offload checksum comparison to the main CPU threadpool.
     // This cuts run time by about 30%.
     this->spawnChild(SkNEW_ARGS(ComparisonTask, (*this, fExpectations, bitmap)));