add DeferredCanvas mode to SampleApp

samplecode/SampleApp.h

 /*
  * Copyright 2011 Skia
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SampleApp_DEFINED
 #define SampleApp_DEFINED
 
 #include "SkOSMenu.h"
 #include "SkPath.h"
 #include "SkPicture.h"
 #include "SkPictureRecorder.h"
 #include "SkScalar.h"
 #include "SkTDArray.h"
 #include "SkTouchGesture.h"
 #include "SkWindow.h"
 
 class GrContext;
 class GrRenderTarget;
 
 class SkCanvas;
 class SkData;
+class SkDeferredCanvas;
 class SkDocument;
 class SkEvent;
 class SkTypeface;
 class SkViewFactory;
 
 class SampleWindow : public SkOSWindow {
     SkTDArray<const SkViewFactory*> fSamples;
 public:
     enum DeviceType {
         kRaster_DeviceType,
         kPicture_DeviceType,
 #if SK_SUPPORT_GPU
         kGPU_DeviceType,
 #if SK_ANGLE
         kANGLE_DeviceType,
 #endif // SK_ANGLE
 #endif // SK_SUPPORT_GPU
-
+        kDeferred_DeviceType,
         kDeviceTypeCnt
     };
 
     static bool IsGpuDeviceType(DeviceType devType) {
     #if SK_SUPPORT_GPU
         switch (devType) {
             case kGPU_DeviceType:
     #if SK_ANGLE
             case kANGLE_DeviceType:
     #endif // SK_ANGLE
@@ skipping 101 matching lines @@
     bool onClick(Click* click) override;
     virtual Click* onFindClickHandler(SkScalar x, SkScalar y,
                                       unsigned modi) override;
 
 private:
     class DefaultDeviceManager;
 
     int fCurrIndex;
 
     SkPictureRecorder fRecorder;
+    SkAutoTDelete<SkSurface> fDeferredSurface;
+    SkAutoTDelete<SkDeferredCanvas> fDeferredCanvas;
     SkPath fClipPath;
 
     SkTouchGesture fGesture;
     SkScalar fZoomLevel;
     SkScalar fZoomScale;
 
     DeviceType fDeviceType;
     DeviceManager* fDevManager;
 
     bool fSaveToPdf;
@@ skipping 58 matching lines @@
     void installDrawFilter(SkCanvas*);
     int findByTitle(const char*);
     void listTitles();
     SkSize tileSize() const;
     bool sendAnimatePulse();
 
     typedef SkOSWindow INHERITED;
 };
 
 #endif