DM: make GPU tasks multithreaded again. Big refactor.

dm/DMGpuTask.cpp

-#include "DMGpuTask.h"
-
-#include "DMExpectationsTask.h"
-#include "DMUtil.h"
-#include "DMWriteTask.h"
-#include "SkCommandLineFlags.h"
-#include "SkSurface.h"
-#include "SkTLS.h"
-
-namespace DM {
-
-GpuTask::GpuTask(const char* config,
-                 Reporter* reporter,
-                 TaskRunner* taskRunner,
-                 const Expectations& expectations,
-                 skiagm::GMRegistry::Factory gmFactory,
-                 GrContextFactory::GLContextType contextType,
-                 int sampleCount)
-    : Task(reporter, taskRunner)
-    , fGM(gmFactory(NULL))
-    , fName(UnderJoin(fGM->getName(), config))
-    , fExpectations(expectations)
-    , fContextType(contextType)
-    , fSampleCount(sampleCount)
-    {}
-
-void GpuTask::draw() {
-    SkImageInfo info = SkImageInfo::Make(SkScalarCeilToInt(fGM->width()),
-                                         SkScalarCeilToInt(fGM->height()),
-                                         kPMColor_SkColorType,
-                                         kPremul_SkAlphaType);
-    SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTarget(
-            this->getGrContextFactory()->get(fContextType), info, fSampleCount));
-    SkCanvas* canvas = surface->getCanvas();
-
-    canvas->concat(fGM->getInitialTransform());
-    fGM->draw(canvas);
-    canvas->flush();
-
-    SkBitmap bitmap;
-    bitmap.setConfig(info);
-    canvas->readPixels(&bitmap, 0, 0);
-
-#if GR_CACHE_STATS
-    gr->printCacheStats();
-#endif
-
-    this->spawnChild(SkNEW_ARGS(ExpectationsTask, (*this, fExpectations, bitmap)));
-    this->spawnChild(SkNEW_ARGS(WriteTask, (*this, bitmap)));
-}
-
-bool GpuTask::shouldSkip() const {
-    return SkToBool(fGM->getFlags() & skiagm::GM::kSkipGPU_Flag);
-}
-
-}  // namespace DM