Add --resourcePath flag to the test program.

tests/StreamTest.cpp

Index: tests/StreamTest.cpp
diff --git a/tests/StreamTest.cpp b/tests/StreamTest.cpp
index 2b86e7bca347097295e3c9d9dbc8dbe3b52cd144..d0a850724107cd46c62b993f029b967d8b57c698 100644
--- a/tests/StreamTest.cpp
+++ b/tests/StreamTest.cpp
@@ -155,8 +155,8 @@ static void TestWStream(skiatest::Reporter* reporter) {
     }
     delete[] dst;
 
-    if (skiatest::Test::GetTmpDir()) {
-        test_filestreams(reporter, skiatest::Test::GetTmpDir());
+    if (!skiatest::Test::GetTmpDir().isEmpty()) {
+        test_filestreams(reporter, skiatest::Test::GetTmpDir().c_str());
     }
 }