add ganesh checkbox to skfiddle interface

experimental/webtry/main.cpp

 #include <sys/time.h>
 #include <sys/resource.h>
 
+#include "GrContextFactory.h"
+
 #include "SkCanvas.h"
 #include "SkCommandLineFlags.h"
 #include "SkData.h"
 #include "SkForceLinking.h"
 #include "SkGraphics.h"
 #include "SkImageDecoder.h"
 #include "SkImageEncoder.h"
 #include "SkImageInfo.h"
 #include "SkOSFile.h"
 #include "SkStream.h"
 #include "SkSurface.h"
 
 #include "seccomp_bpf.h"
 
 __SK_FORCE_IMAGE_DECODER_LINKING;
 
 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;
 
 static bool install_syscall_filter() {
 
 #ifndef SK_UNSAFE_BUILD_DESKTOP_ONLY
     struct sock_filter filter[] = {
         /* Grab the system call number. */
         EXAMINE_SYSCALL,
@@ skipping 78 matching lines @@
 
         SkString sourcePath = SkOSPath::Join(sourceDir, FLAGS_source[0]);
         if (!SkImageDecoder::DecodeFile(sourcePath.c_str(), &source)) {
             perror("Unable to read the source image.");
         }
     }
 
     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();
 
     if (!install_syscall_filter()) {
         return 1;
     }
 
     draw(canvas);
 
     // Write out the image as a PNG.
     SkAutoTUnref<SkImage> image(surface->newImageSnapshot());
     SkAutoTUnref<SkData> data(image->encode(SkImageEncoder::kPNG_Type, 100));
     if (NULL == data.get()) {
         printf("Failed to encode\n");
         exit(1);
     }
     stream.write(data->data(), data->size());
+    delete grFactory;
 }