Serialize DisplayListRecordingSource to protos.

cc/proto/display_list_recording_source.proto

Index: cc/proto/display_list_recording_source.proto
diff --git a/cc/proto/display_list_recording_source.proto b/cc/proto/display_list_recording_source.proto
new file mode 100644
index 0000000000000000000000000000000000000000..1ef90629617d958036e7d608b664ee4cfbe1c33b
--- /dev/null
+++ b/cc/proto/display_list_recording_source.proto
@@ -0,0 +1,37 @@
+// 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 "display_item.proto";
+import "rect.proto";
+import "size.proto";
+
+option optimize_for = LITE_RUNTIME;
+
+package cc.proto;
+
+// A serialized representation of the DisplayListRecordingSource class.
+message DisplayListRecordingSource {
+  // required

[vmpstr, 2015/12/10 01:12:19]

Skip these comments.. Maybe just say a blanket "all fields are required by the
protocol, but are optional in order for it to be able to change." Or maybe just
don't comment.

[David Trainor- moved to gerrit, 2015/12/10 17:10:10]

Done.

+  optional Rect recorded_viewport = 1;
+  // required
+  optional Size size = 2;
+  // required
+  optional int64 slow_down_raster_scale_factor_for_debug = 3;
+  // required
+  optional bool generate_discardable_images_metadata = 4;
+  // required
+  optional bool requires_clear = 5;
+  // required
+  optional bool is_solid_color = 6;
+  // required
+  optional bool clear_canvas_with_debug_color = 7;
+  // required
+  optional uint64 solid_color = 8;
+  // required
+  optional uint64 background_color = 9;
+  // required
+  optional DisplayItemList display_list = 10;
+}