Add config options to run different GPU APIs to dm and nanobench

include/core/SkString.h

Index: include/core/SkString.h
diff --git a/include/core/SkString.h b/include/core/SkString.h
index 9229d808a63d00ab79e758d249f5cd08952daf41..93514f2659febb67a6588cdc214595f278c825a4 100644
--- a/include/core/SkString.h
+++ b/include/core/SkString.h
@@ -267,7 +267,22 @@ template <> inline void SkTSwap(SkString& a, SkString& b) {
     a.swap(b);
 }
 
+enum SkStrSplitMode {
+    // Strictly return all results. If the input is ",," and the separator is ',' this will return
+    // an array of three empty strings.
+    kStrict_SkStrSplitMode,
+
+    // Only nonempty results will be added to the results. Multiple separators will be
+    // coalesced. Separators at the beginning and end of the input will be ignored.  If the input is
+    // ",," and the separator is ',', this will return an empty vector.
+    kCoalesce_SkStrSplitMode
+};
+
 // Split str on any characters in delimiters into out.  (Think, strtok with a sane API.)
-void SkStrSplit(const char* str, const char* delimiters, SkTArray<SkString>* out);
+void SkStrSplit(const char* str, const char* delimiters, SkStrSplitMode splitMode,
+                SkTArray<SkString>* out);
+inline void SkStrSplit(const char* str, const char* delimiters, SkTArray<SkString>* out) {
+    SkStrSplit(str, delimiters, kCoalesce_SkStrSplitMode, out);
+}
 
 #endif