Add iterator range constructors to StringPiece.

base/string_piece_unittest.cc

Index: base/string_piece_unittest.cc
diff --git a/base/string_piece_unittest.cc b/base/string_piece_unittest.cc
index 1362d4e5c7d58bb3dfa85e2714b1948d48e90ea0..b95b6eeaaac5f2c064851b013d4d7e45e003b1ef 100644
--- a/base/string_piece_unittest.cc
+++ b/base/string_piece_unittest.cc
@@ -653,4 +653,22 @@ TEST(StringPiece16Test, CheckConversion) {
       "\xf0\x9d\x84\x9e");
 }
 
+TYPED_TEST(CommonStringPieceTest, CheckConstructors) {
+  TypeParam str(TestFixture::as_string("hello world"));
+  TypeParam empty;
+
+  ASSERT_TRUE(str == BasicStringPiece<TypeParam>(str));
+  ASSERT_TRUE(str == BasicStringPiece<TypeParam>(str.c_str()));
+  ASSERT_TRUE(TestFixture::as_string("hello") ==
+              BasicStringPiece<TypeParam>(str.c_str(), 5));
+  ASSERT_TRUE(empty == BasicStringPiece<TypeParam>(str.c_str(), 0));
+  ASSERT_TRUE(empty == BasicStringPiece<TypeParam>(NULL));
+  ASSERT_TRUE(empty == BasicStringPiece<TypeParam>(NULL, 0));
+  ASSERT_TRUE(empty == BasicStringPiece<TypeParam>());
+  ASSERT_TRUE(str == BasicStringPiece<TypeParam>(str.begin(), str.end()));
+  ASSERT_TRUE(empty == BasicStringPiece<TypeParam>(str.begin(), str.begin()));
+  ASSERT_TRUE(empty == BasicStringPiece<TypeParam>(empty));
+  ASSERT_TRUE(empty == BasicStringPiece<TypeParam>(empty.begin(), empty.end()));
+}
+
 }  // namespace base