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

cc/base/region_unittest.cc

 // Copyright 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 "cc/proto/region.pb.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
 namespace {
 
 #define TEST_INSIDE_RECT(r, x, y, w, h)                      \
   EXPECT_TRUE(r.Contains(gfx::Point(x, y)));                 \
   EXPECT_TRUE(r.Contains(gfx::Point(x + w - 1, y)));         \
   EXPECT_TRUE(r.Contains(gfx::Point(x, y + h - 1)));         \
   EXPECT_TRUE(r.Contains(gfx::Point(x + w - 1, y + h - 1))); \
@@ skipping 426 matching lines @@
 
   r1 = gfx::Rect(0, 0, 50, 50);
   r1.Union(gfx::Rect(100, 0, 50, 50));
   r1.Union(gfx::Rect(0, 0, 500, 500));
   r3 = r1;
   r1.Swap(&r2);
   EXPECT_EQ(r1.ToString(), Region(gfx::Rect(0, 0, 50, 50)).ToString());
   EXPECT_EQ(r2.ToString(), r3.ToString());
 }
 
+TEST(RegionTest, ProtoConversion) {
+  Region region1(gfx::Rect(14, 15, 16, 17));
+  proto::Region proto;
+  region1.ToProtobuf(&proto);
+  Region region2;
+  region2.FromProtobuf(proto);
+  EXPECT_EQ(region1, region2);
+}
+
 }  // namespace
 }  // namespace cc