Make SKP bench JSON ouput better

BUG=skia:
NOTREECHECKS=true
R=bensong@google.com, jcgregorio@google.com, bsalomon@google.com, robertphillips@google.com, rmistry@google.com

Author: kelvinly@google.com

Review URL: https://codereview.chromium.org/329993008
diff --git a/tools/PictureBenchmark.cpp b/tools/PictureBenchmark.cpp
index 85a49f4..70ce180 100644
--- a/tools/PictureBenchmark.cpp
+++ b/tools/PictureBenchmark.cpp
@@ -173,7 +173,7 @@
                 SkAssertResult(longRunningTimerData.appendTimes(longRunningTimer.get()));
             }
 
-            fWriter->tileConfig(tiledRenderer->getConfigName());
+            fWriter->logRenderer(tiledRenderer);
             fWriter->tileMeta(x, y, xTiles, yTiles);
 
             // TODO(borenet): Turn off per-iteration tile time reporting for now.
@@ -236,7 +236,7 @@
             SkAssertResult(longRunningTimerData.appendTimes(longRunningTimer.get()));
         }
 
-        fWriter->tileConfig(fRenderer->getConfigName());
+        fWriter->logRenderer(fRenderer);
         if (fPurgeDecodedTex) {
             fWriter->addTileFlag(PictureResultsWriter::kPurging);
         }