DM: make GPU tasks multithreaded again. Big refactor.

dm/DMTestTask.h

 #ifndef DMTestTask_DEFINED
 #define DMTestTask_DEFINED
 
 #include "DMReporter.h"
 #include "DMTask.h"
 #include "DMTaskRunner.h"
 #include "SkString.h"
 #include "SkTemplates.h"
 #include "Test.h"
 
 // Runs a unit test.
 namespace DM {
 
-class TestTask : public Task {
+class TestReporter : public skiatest::Reporter {
 public:
-    TestTask(Reporter*, TaskRunner*, skiatest::TestRegistry::Factory);
+  TestReporter() {}
+
+  const char* failure() const { return fFailure.c_str(); }
+
+private:
+  virtual bool allowExtendedTest() const SK_OVERRIDE;
+  virtual bool allowThreaded()     const SK_OVERRIDE;
+  virtual bool verbose()           const SK_OVERRIDE;
+
+  virtual void onReportFailed(const SkString& desc) SK_OVERRIDE {
+      fFailure = desc;
+  }
+
+  SkString fFailure;
+};
+
+class CpuTestTask : public CpuTask {
+public:
+    CpuTestTask(Reporter*, TaskRunner*, skiatest::TestRegistry::Factory);
 
     virtual void draw() SK_OVERRIDE;
-    virtual bool usesGpu() const SK_OVERRIDE { return fTest->isGPUTest(); }
     virtual bool shouldSkip() const SK_OVERRIDE { return false; }
     virtual SkString name() const SK_OVERRIDE { return fName; }
 
 private:
-    class TestReporter : public skiatest::Reporter {
-    public:
-      TestReporter() {}
-
-      const char* failure() const { return fFailure.c_str(); }
-
-    private:
-      virtual bool allowExtendedTest() const SK_OVERRIDE;
-      virtual bool allowThreaded()     const SK_OVERRIDE;
-      virtual bool verbose()           const SK_OVERRIDE;
-
-      virtual void onReportFailed(const SkString& desc) SK_OVERRIDE {
-          fFailure = desc;
-      }
-
-      SkString fFailure;
-    };
-
     TestReporter fTestReporter;
     SkAutoTDelete<skiatest::Test> fTest;
     const SkString fName;
+};
+
+class GpuTestTask : public GpuTask {
+public:
+    GpuTestTask(Reporter*, TaskRunner*, skiatest::TestRegistry::Factory);
+
+    virtual void draw(GrContextFactory*) SK_OVERRIDE;
+    virtual bool shouldSkip() const SK_OVERRIDE { return false; }
+    virtual SkString name() const SK_OVERRIDE { return fName; }
+
+private:
+    TestReporter fTestReporter;
+    SkAutoTDelete<skiatest::Test> fTest;
+    const SkString fName;
 };
 
 }  // namespace DM
 
 #endif // DMTestTask_DEFINED