Fixing deferred canvas bug caused by SkTwoPointConicalGradient declaring itself as opaque.

src/effects/gradients/SkTwoPointConicalGradient.h

 
 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
  #ifndef SkTwoPointConicalGradient_DEFINED
  #define SkTwoPointConicalGradient_DEFINED
@@ skipping 44 matching lines @@
                            int count) SK_OVERRIDE;
     virtual bool setContext(const SkBitmap& device,
                             const SkPaint& paint,
                             const SkMatrix& matrix) SK_OVERRIDE;
 
     virtual BitmapType asABitmap(SkBitmap* bitmap,
                                  SkMatrix* matrix,
                                  TileMode* xy) const;
     virtual SkShader::GradientType asAGradient(GradientInfo* info) const  SK_OVERRIDE;
     virtual GrEffectRef* asNewEffect(GrContext* context, const SkPaint& paint) const SK_OVERRIDE;
+    virtual bool isOpaque() const SK_OVERRIDE;
 
     SkScalar getCenterX1() const { return SkPoint::Distance(fCenter1, fCenter2); }
     SkScalar getStartRadius() const { return fRadius1; }
     SkScalar getDiffRadius() const { return fRadius2 - fRadius1; }
 
     SK_DEVELOPER_TO_STRING()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTwoPointConicalGradient)
 
 protected:
     SkTwoPointConicalGradient(SkFlattenableReadBuffer& buffer);
     virtual void flatten(SkFlattenableWriteBuffer& buffer) const SK_OVERRIDE;
 
 private:
     typedef SkGradientShaderBase INHERITED;
     const SkPoint fCenter1;
     const SkPoint fCenter2;
     const SkScalar fRadius1;
     const SkScalar fRadius2;
 };
 
 #endif