[render-test] Prettyfy metrics output

render-test/parser.cpp

@@ -270,7 +270,7 @@ std::string serializeJsonValue(const mbgl::JSValue& value) {
 
 std::string serializeMetrics(const TestMetrics& metrics) {
     rapidjson::StringBuffer s;
-    rapidjson::Writer<rapidjson::StringBuffer> writer(s);
+    rapidjson::PrettyWriter<rapidjson::StringBuffer> writer(s);
 
     writer.StartObject();
 

render-test/tests/filesize/fail-file-doesnt-match/metrics.json

@@ -1 +1,14 @@
-{"fileSize":[["image","foo.123",442],["style","bar.321",609]]}
+{
+    "fileSize": [
+        [
+            "image",
+            "expected.aaa",
+            169
+        ],
+        [
+            "style",
+            "style.bbbb",
+            510
+        ]
+    ]
+}

render-test/tests/filesize/fail-size-is-over/metrics.json

@@ -1 +1,14 @@
-{"fileSize":[["image","expected.png",999],["style","style.json",999]]}
+{
+    "fileSize": [
+        [
+            "image",
+            "expected.png",
+            999
+        ],
+        [
+            "style",
+            "style.json",
+            999
+        ]
+    ]
+}

render-test/tests/filesize/fail-size-is-under/metrics.json

@@ -1 +1,14 @@
-{"fileSize":[["image","expected.png",100],["style","style.json",100]]}
+{
+    "fileSize": [
+        [
+            "image",
+            "expected.png",
+            100
+        ],
+        [
+            "style",
+            "style.json",
+            100
+        ]
+    ]
+}

render-test/tests/filesize/pass-size-is-same/metrics.json

@@ -1 +1,14 @@
-{"fileSize":[["image","expected.png",169],["style","style.json",510]]}
+{
+    "fileSize": [
+        [
+            "image",
+            "expected.png",
+            169
+        ],
+        [
+            "style",
+            "style.json",
+            510
+        ]
+    ]
+}