Add support for converting cc::Region to and from protobuf.

cc/base/region.cc

 // Copyright (c) 2012 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/base/region.h"
 
 #include "base/trace_event/trace_event_argument.h"
 #include "base/values.h"
 #include "cc/base/simple_enclosed_region.h"
+#include "cc/proto/region.pb.h"
 
 namespace cc {
 
 Region::Region() {
 }
 
 Region::Region(const Region& region)
     : skregion_(region.skregion_) {
 }
 
@@ skipping 113 matching lines @@
 void Region::AsValueInto(base::trace_event::TracedValue* result) const {
   for (Iterator it(*this); it.has_rect(); it.next()) {
     gfx::Rect rect(it.rect());
     result->AppendInteger(rect.x());
     result->AppendInteger(rect.y());
     result->AppendInteger(rect.width());
     result->AppendInteger(rect.height());
   }
 }
 
+void Region::ToProtobuf(proto::Region* proto) const {
+  size_t region_size = skregion_.writeToMemory(nullptr);
+  if (region_size > 0) {
+    scoped_ptr<char[]> buffer(new char[region_size]);

[David Trainor- moved to gerrit, 2015/11/19 19:14:01]

uint8_t?  Again same for the DisplayItem protos :(.  Thanks!

[nyquist, 2015/11/20 01:11:43]

Done.

+    skregion_.writeToMemory(buffer.get());
+    proto->set_skregion(std::string(buffer.get(), region_size));
+  }
+}
+
+void Region::FromProtobuf(const proto::Region& proto) {
+  SkRegion region;
+  if (proto.has_skregion()) {
+    size_t bytes_read = region.readFromMemory(proto.skregion().c_str(),

[David Trainor- moved to gerrit, 2015/11/19 19:14:01]

.data?  Could you also do this for the DisplayItem* protos?  Thanks!

[nyquist, 2015/11/20 01:11:43]

Done.

+                                              proto.skregion().size());
+    DCHECK_EQ(proto.skregion().size(), bytes_read);
+  }
+  skregion_ = region;
+}
+
 Region::Iterator::Iterator() {
 }
 
 Region::Iterator::Iterator(const Region& region)
     : it_(region.skregion_) {
 }
 
 Region::Iterator::~Iterator() {
 }
 
 }  // namespace cc