make fontscalar gammatext lcdtext typeface verttext2 gm portable

gm/gammatext.cpp

Index: gm/gammatext.cpp
diff --git a/gm/gammatext.cpp b/gm/gammatext.cpp
index ed8c82929d60d74dfaa0dce48c95c581b71ed5d6..b6d4ea23f236e1acb00578c8d85da88edc41d338 100644
--- a/gm/gammatext.cpp
+++ b/gm/gammatext.cpp
@@ -40,7 +40,9 @@ static bool setFont(SkPaint* paint, const char name[]) {
 class GammaTextGM : public skiagm::GM {
 protected:
     SkString onShortName() override {
-        return SkString("gammatext");
+        SkString name("gammatext");
+        name.append(sk_tool_utils::major_platform_os_name());
+        return name;
     }
 
     SkISize onISize() override {
@@ -72,7 +74,7 @@ protected:
         size_t len = strlen(text);
 
         SkPaint paint;
-        setFont(&paint, "Times");
+        setFont(&paint, sk_tool_utils::platform_font_name("serif"));
         paint.setTextSize(SkIntToScalar(16));
         paint.setAntiAlias(true);
         paint.setLCDRenderText(true);