add ganesh checkbox to skfiddle interface

experimental/webtry/main.cpp

Index: experimental/webtry/main.cpp
diff --git a/experimental/webtry/main.cpp b/experimental/webtry/main.cpp
index 98c2f5e4e68aa6a6421d32bb6533da005a1414e3..f35dd04f6f6df30031ef75e3c68a582a26e4f65c 100644
--- a/experimental/webtry/main.cpp
+++ b/experimental/webtry/main.cpp
@@ -1,6 +1,8 @@
 #include <sys/time.h>
 #include <sys/resource.h>
 
+#include "GrContextFactory.h"
+
 #include "SkCanvas.h"
 #include "SkCommandLineFlags.h"
 #include "SkData.h"
@@ -21,6 +23,7 @@ DEFINE_string(out, "", "Filename of the PNG to write to.");
 DEFINE_string(source, "", "Filename of the source image.");
 DEFINE_int32(width, 256, "Width of output image.");
 DEFINE_int32(height, 256, "Height of output image.");
+DEFINE_bool(gpu, false, "Use GPU (Mesa) rendering.");
 
 // Defined in template.cpp.
 extern SkBitmap source;
@@ -119,8 +122,22 @@ int main(int argc, char** argv) {
     SkFILEWStream stream(FLAGS_out[0]);
 
     SkImageInfo info = SkImageInfo::MakeN32(FLAGS_width, FLAGS_height, kPremul_SkAlphaType);
-    SkAutoTUnref<SkSurface> surface(SkSurface::NewRaster(info));
-    SkCanvas* canvas = surface->getCanvas();
+
+    SkCanvas* canvas;
+    SkAutoTUnref<SkSurface> surface;
+
+    GrContextFactory* grFactory = NULL;
+
+    if (FLAGS_gpu) {
+        GrContext::Options grContextOpts;
+        grFactory = new GrContextFactory(grContextOpts);
+        GrContext* gr = grFactory->get(GrContextFactory::kMESA_GLContextType);
+        surface.reset(SkSurface::NewRenderTarget(gr,info));
+    } else {
+        surface.reset(SkSurface::NewRaster(info));
+    }    
+
+    canvas = surface->getCanvas();
 
     setLimits();
 
@@ -138,4 +155,5 @@ int main(int argc, char** argv) {
         exit(1);
     }
     stream.write(data->data(), data->size());
+    delete grFactory;
 }