Add support for zero-padded strings to WebMParser.

media/webm/webm_parser_unittest.cc

Index: media/webm/webm_parser_unittest.cc
diff --git a/media/webm/webm_parser_unittest.cc b/media/webm/webm_parser_unittest.cc
index 4c140a6f6a78fbab01f6c88af3357449b565db13..43ad3c2b80e0dbc5d405f8cc741e507c7b3d682e 100644
--- a/media/webm/webm_parser_unittest.cc
+++ b/media/webm/webm_parser_unittest.cc
@@ -367,4 +367,29 @@ TEST_F(WebMParserTest, ReservedSizes) {
   }
 }
 
+TEST_F(WebMParserTest, ZeroPaddedStrings) {
+  const uint8 kBuffer[] = {
+    0x1A, 0x45, 0xDF, 0xA3, 0x91,  // EBMLHEADER (size = 17)
+    0x42, 0x82, 0x80,  // DocType (size = 0)
+    0x42, 0x82, 0x81, 0x00,  // DocType (size = 1) ""
+    0x42, 0x82, 0x81, 'a',  // DocType (size = 1) "a"
+    0x42, 0x82, 0x83, 'a', 0x00, 0x00  // DocType (size = 3) "a"
+  };
+  int size = sizeof(kBuffer);
+
+  InSequence s;
+  EXPECT_CALL(client_, OnListStart(kWebMIdEBMLHeader))
+      .WillOnce(Return(&client_));
+  EXPECT_CALL(client_, OnString(kWebMIdDocType, "")).WillOnce(Return(true));
+  EXPECT_CALL(client_, OnString(kWebMIdDocType, "")).WillOnce(Return(true));
+  EXPECT_CALL(client_, OnString(kWebMIdDocType, "a")).WillOnce(Return(true));
+  EXPECT_CALL(client_, OnString(kWebMIdDocType, "a")).WillOnce(Return(true));
+  EXPECT_CALL(client_, OnListEnd(kWebMIdEBMLHeader)).WillOnce(Return(true));
+
+  WebMListParser parser(kWebMIdEBMLHeader, &client_);
+  int result = parser.Parse(kBuffer, size);
+  EXPECT_EQ(size, result);
+  EXPECT_TRUE(parser.IsParsingComplete());
+}
+
 }  // namespace media