Dust-off SkXMLParser

tests/SkDOMTest.cpp

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkDOM.h"
+#include "SkStream.h"
+#include "Test.h"
+
+DEF_TEST(SkDOM_test, r) {
+    static const char gDoc[] =
+        "<root a='1' b='2'>"
+            "<elem1 c='3' />"
+            "<elem2 d='4' />"
+            "<elem3 e='5'>"
+                "<subelem1/>"
+                "<subelem2 f='6' g='7'/>"
+            "</elem3>"
+            "<elem4 h='8'/>"
+        "</root>"
+        ;
+
+    SkMemoryStream docStream(gDoc, sizeof(gDoc) - 1);
+
+    SkDOM   dom;
+    REPORTER_ASSERT(r, !dom.getRootNode());
+
+    const SkDOM::Node* root = dom.build(docStream);

[stephana, 2016/07/14 18:53:22]

Nit: 
If you called 

  ... dom.build(gDoc, sizeof(gDoc)-1); 

you would test both build functions. 
Unless I am missing something. 

[f(malita), 2016/07/14 23:22:11]

Done.

I was thinking we should kill that build variant since SkStream is a
generalization, but sure, let's cover it in the meantime.

+    REPORTER_ASSERT(r, root && dom.getRootNode() == root);
+
+    const char* v = dom.findAttr(root, "a");
+    REPORTER_ASSERT(r, v && !strcmp(v, "1"));
+    v = dom.findAttr(root, "b");
+    REPORTER_ASSERT(r, v && !strcmp(v, "2"));
+    v = dom.findAttr(root, "c");
+    REPORTER_ASSERT(r, v == nullptr);
+
+    REPORTER_ASSERT(r, dom.getFirstChild(root, "elem1"));
+    REPORTER_ASSERT(r, !dom.getFirstChild(root, "subelem1"));
+}