Make XML compilation conditional.

tests/SkDOMTest.cpp

Index: tests/SkDOMTest.cpp
diff --git a/tests/SkDOMTest.cpp b/tests/SkDOMTest.cpp
index aca2c4870bb58943435a5a223aefd9f1c1b0470b..7d170dcc27621b9dfaef9a1bb39eb4bf6c2d471c 100644
--- a/tests/SkDOMTest.cpp
+++ b/tests/SkDOMTest.cpp
@@ -8,6 +8,8 @@
 #include "SkDOM.h"
 #include "Test.h"
 
+#if defined(SK_XML)

[dogben, 2016/07/15 14:41:41]

Does this need to be before the includes?

[f(malita), 2016/07/15 14:46:30]

There's a presubmit check I tripped while trying to do that.  But SkDOM.h
doesn't seem to pull in any XML headers, so hopefully not required.

[mtklein, 2016/07/15 16:20:32]

The presubmit is there to guard against

#ifdef SK_BUILD_FOR_PLATFORM_DEFINED_IN_SKTYPES

#include "SkTypes.h"

#endif

If you want to quiet it down spiritually, you can

#include "SkTypes.h"

#if defined(SK_XML)

#include "SkDOM.h"
...

(That'd let SK_XML be defined in SkUserConfig.h, etc.)

[f(malita), 2016/07/15 16:47:55]

Done.

+
 DEF_TEST(SkDOM_test, r) {
     static const char gDoc[] =
         "<root a='1' b='2'>"
@@ -37,3 +39,5 @@ DEF_TEST(SkDOM_test, r) {
     REPORTER_ASSERT(r, dom.getFirstChild(root, "elem1"));
     REPORTER_ASSERT(r, !dom.getFirstChild(root, "subelem1"));
 }
+
+#endif // SK_XML