Add Protobuf support for cc/playback skia usage

Add protobuf serialization to the following:
- SkRegion::Op
- SkXfermode::Mode
- SkRRect

These are used by cc/playback DisplayItem classes.

In the short term, will just use Skia's flatten for:
- SkColorFilter
- SkPath
- SkPicture

BUG=541321
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1399933004

Cr-Commit-Position: refs/heads/master@{#355865}

1 files changed, 20 insertions, 0 deletions

diff --git a/cc/proto/skrrect.proto b/cc/proto/skrrect.proto
new file mode 100644
index 0000000..28a8be4
--- /dev/null
+++ b/cc/proto/skrrect.proto
@@ -0,0 +1,20 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+syntax = "proto2";
+
+import "pointf.proto";
+import "rectf.proto";
+
+option optimize_for = LITE_RUNTIME;
+
+package cc.proto;
+
+message SkRRect {
+  optional cc.proto.RectF rect = 1;
+  optional cc.proto.PointF radii_upper_left = 2;
+  optional cc.proto.PointF radii_upper_right = 3;
+  optional cc.proto.PointF radii_lower_right = 4;
+  optional cc.proto.PointF radii_lower_left = 5;
+}