Sketch DM refactor.

dm/DMPipeTask.h

-#ifndef DMPipeTask_DEFINED
-#define DMPipeTask_DEFINED
-
-#include "DMTask.h"
-#include "SkBitmap.h"
-#include "SkString.h"
-#include "SkTemplates.h"
-#include "gm.h"
-
-// Sends a GM through a pipe, draws it, and compares against the reference bitmap.
-
-namespace DM {
-
-class PipeTask : public CpuTask {
-
-public:
-    enum Mode {
-        kInProcess_Mode,
-        kCrossProcess_Mode,
-        kSharedAddress_Mode,
-    };
-
-    PipeTask(const Task& parent,        // PipeTask must be a child task.  Pass its parent here.
-             skiagm::GM*,               // GM to run through a pipe.  Takes ownership.
-             SkBitmap reference,        // Bitmap to compare pipe results to.
-             Mode);
-
-    void draw() SK_OVERRIDE;
-    bool shouldSkip() const SK_OVERRIDE;
-    SkString name() const SK_OVERRIDE { return fName; }
-
-private:
-    const uint32_t fFlags;
-    const SkString fName;
-    SkAutoTDelete<skiagm::GM> fGM;
-    const SkBitmap fReference;
-};
-
-}  // namespace DM
-
-#endif  // DMPipeTask_DEFINED