Enable libtxt as the default text renderer (#4773)

shell/common/shell.cc

@@ -121,7 +121,7 @@ void Shell::InitStandalone(fxl::CommandLine command_line,
       command_line.HasOption(FlagForSwitch(Switch::EnableSoftwareRendering));
 
   settings.using_blink =
-      !command_line.HasOption(FlagForSwitch(Switch::EnableTxt));
+      command_line.HasOption(FlagForSwitch(Switch::EnableBlink));
 
   settings.endless_trace_buffer =
       command_line.HasOption(FlagForSwitch(Switch::EndlessTraceBuffer));

shell/common/switches.h

@@ -63,9 +63,9 @@ DEF_SWITCH(SkiaDeterministicRendering,
            "Skips the call to SkGraphics::Init(), thus avoiding swapping out"
            "some Skia function pointers based on available CPU features. This"
            "is used to obtain 100% deterministic behavior in Skia rendering.")
-DEF_SWITCH(EnableTxt,
-           "enable-txt",
-           "Enable libtxt as the text shaping library instead of Blink.")
+DEF_SWITCH(EnableBlink,
+           "enable-blink",
+           "Enable Blink as the text shaping library instead of libtxt.")
 DEF_SWITCH(FLX, "flx", "Specify the FLX path.")
 DEF_SWITCH(FlutterAssetsDir,
            "flutter-assets-dir",