Don't clear in SkSurface::NewWrappedRenderTarget

src/image/SkSurface_Gpu.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkSurface_Gpu.h"
 
 #include "SkCanvas.h"
@@ skipping 95 matching lines @@
     if (NULL == context) {
         return NULL;
     }
     if (!SkToBool(desc.fFlags & kRenderTarget_GrBackendTextureFlag)) {
         return NULL;
     }
     SkAutoTUnref<GrSurface> surface(context->textureProvider()->wrapBackendTexture(desc));
     if (!surface) {
         return NULL;
     }
-    SkAutoTUnref<SkGpuDevice> device(SkGpuDevice::Create(surface->asRenderTarget(), props,
-                                                         SkGpuDevice::kNeedClear_Flag));
+    SkAutoTUnref<SkGpuDevice> device(SkGpuDevice::Create(surface->asRenderTarget(), props));
     if (!device) {
         return NULL;
     }
     return SkNEW_ARGS(SkSurface_Gpu, (device));
 }
 
 #endif