Add <xmlfile> to manifest / comp mat.

manifest.xml is allowed to contain <xmlfile> that is similar to:
<xmlfile>
    <name>media_profile</name>
    <version>1.0</version>
    <path>/path/to/media_profile_v1_0.xml</path>
</xmlfile>

For compatibility-matrix.xml
<xmlfile format="dtd" optional="false">
    <name>media_profile</name>
    <version>1.0-1</version>
    <path>/path/to/media_profile_v1_1.dtd</path>
</xmlfile>

The <path> tag is optional. See test/main.cpp for examples.

Test: libvintf_test
Test: vintf_object_test

Bug: 38359330

Change-Id: I0a921f32d023e1ba9c54ea6e898bb385fc7abd4f
diff --git a/XmlFile.cpp b/XmlFile.cpp
new file mode 100644
index 0000000..695b3d4
--- /dev/null
+++ b/XmlFile.cpp
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "XmlFile.h"
+
+namespace android {
+namespace vintf {
+
+bool MatrixXmlFile::operator==(const MatrixXmlFile& other) const {
+    return name() == other.name() && overriddenPath() == other.overriddenPath() &&
+           optional() == other.optional() && format() == other.format() &&
+           versionRange() == other.versionRange();
+}
+
+bool ManifestXmlFile::operator==(const ManifestXmlFile& other) const {
+    return name() == other.name() && overriddenPath() == other.overriddenPath() &&
+           version() == other.version();
+}
+
+}  // namespace vintf
+}  // namespace android