[blimp] Add SkPicture caching support.

cc/proto/picture_data.cc

Index: cc/proto/picture_data.cc
diff --git a/cc/proto/picture_data.cc b/cc/proto/picture_data.cc
new file mode 100644
index 0000000000000000000000000000000000000000..75a2415900b74b6b2ee7c87767881dba18faf2b8
--- /dev/null
+++ b/cc/proto/picture_data.cc
@@ -0,0 +1,18 @@
+// Copyright 2016 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.
+
+#include "cc/proto/picture_data.h"
+
+namespace cc {
+
+// PictureData::PictureData() = default;
+
+PictureData::PictureData(uint32_t unique_id, sk_sp<SkData> data)
+    : unique_id(unique_id), data(data) {}
+
+PictureData::PictureData(const PictureData& other) = default;
+
+PictureData::~PictureData() = default;
+
+}  // namespace cc