Add a MotionMark smoothness benchmark.

tools/perf/page_sets/data/motionmark.json

Index: tools/perf/page_sets/data/motionmark.json
diff --git a/tools/perf/page_sets/data/motionmark.json b/tools/perf/page_sets/data/motionmark.json
new file mode 100644
index 0000000000000000000000000000000000000000..b372b72808ef9d608259cf55ad7bfcda499a4922
--- /dev/null
+++ b/tools/perf/page_sets/data/motionmark.json
@@ -0,0 +1,105 @@
+{
+    "archives": {
+        "3D Graphics - WebGL": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "Animometer - Canvas Arcs": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "Animometer - Canvas Lines": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "Animometer - Design": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "Animometer - Focus": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "Animometer - Images": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "Animometer - Leaves": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "Animometer - Multiply": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "Animometer - Paths": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "Animometer - Suits": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "Canvas suite - Canvas put/get image data": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "Canvas suite - Fill shapes": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "Canvas suite - Stroke shapes": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "Canvas suite - canvas bouncing PNG images": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "Canvas suite - canvas bouncing SVG images": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "Canvas suite - canvas bouncing clipped rects": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "Canvas suite - canvas bouncing gradient circles": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "HTML suite - CSS bouncing SVG images": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "HTML suite - CSS bouncing blend circles": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "HTML suite - CSS bouncing circles": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "HTML suite - CSS bouncing clipped rects": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "HTML suite - CSS bouncing filter circles": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "HTML suite - CSS bouncing gradient circles": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "HTML suite - CSS bouncing tagged images": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "HTML suite - Composited Transforms": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "HTML suite - DOM particles, SVG masks": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "HTML suite - Focus 2.0": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "HTML suite - Leaves 2.0": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "SVG suite - SVG bouncing PNG images": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "SVG suite - SVG bouncing SVG images": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "SVG suite - SVG bouncing circles": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "SVG suite - SVG bouncing clipped rects": {
+            "DEFAULT": "motionmark_000.wpr"
+        },
+        "SVG suite - SVG bouncing gradient circles": {
+            "DEFAULT": "motionmark_000.wpr"
+        }
+    },
+    "description": "Describes the Web Page Replay archives for a story set. Don't edit by hand! Use record_wpr for updating.",
+    "platform_specific": true
+}