Support using OpenGL ES context on desktop

dm/DMGpuGMTask.cpp

 #include "DMGpuGMTask.h"
 
 #include "DMExpectationsTask.h"
 #include "DMUtil.h"
 #include "DMWriteTask.h"
 #include "SkCommandLineFlags.h"
 #include "SkSurface.h"
 #include "SkTLS.h"
 
 namespace DM {
 
 GpuGMTask::GpuGMTask(const char* config,
                      Reporter* reporter,
                      TaskRunner* taskRunner,
                      skiagm::GMRegistry::Factory gmFactory,
                      const Expectations& expectations,
                      GrContextFactory::GLContextType contextType,
+                     GrGLStandard gpuAPI,
                      int sampleCount)
     : GpuTask(reporter, taskRunner)
     , fGM(gmFactory(NULL))
     , fName(UnderJoin(fGM->getName(), config))
     , fExpectations(expectations)
     , fContextType(contextType)
+    , fGpuAPI(gpuAPI)
     , fSampleCount(sampleCount)
     {}
 
 void GpuGMTask::draw(GrContextFactory* grFactory) {
     SkImageInfo info = SkImageInfo::Make(SkScalarCeilToInt(fGM->width()),
                                          SkScalarCeilToInt(fGM->height()),
                                          kN32_SkColorType,
                                          kPremul_SkAlphaType);
-    SkAutoTUnref<SkSurface> surface(NewGpuSurface(grFactory, fContextType, info, fSampleCount));
+    SkAutoTUnref<SkSurface> surface(NewGpuSurface(grFactory, fContextType, fGpuAPI, info,
+                                                  fSampleCount));
+    if (!surface) {
+        this->fail("Could not create context for the config and the api.");
+        return;
+    }
     SkCanvas* canvas = surface->getCanvas();
 
     canvas->concat(fGM->getInitialTransform());
     fGM->draw(canvas);
     canvas->flush();
 
     SkBitmap bitmap;
     bitmap.setInfo(info);
     canvas->readPixels(&bitmap, 0, 0);
 
     this->spawnChild(SkNEW_ARGS(ExpectationsTask, (*this, fExpectations, bitmap)));
     this->spawnChild(SkNEW_ARGS(WriteTask, (*this, bitmap)));
 }
 
 bool GpuGMTask::shouldSkip() const {
     return kGPUDisabled || SkToBool(fGM->getFlags() & skiagm::GM::kSkipGPU_Flag);
 }
 
 }  // namespace DM