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

BUG=
R=bsalomon@google.com

Author: mtklein@google.com

Review URL: https://codereview.chromium.org/39743003

git-svn-id: http://skia.googlecode.com/svn/trunk@11950 2bbb7eff-a529-9590-31e7-b0007b416f81

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)));