Fix memory leak

src/gpu/GrPathRenderingDrawContext.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrPathRenderingDrawContext.h"
 
 #include "GrDrawingManager.h"
 
 #include "text/GrStencilAndCoverTextContext.h"
 
 #define ASSERT_SINGLE_OWNER \
     SkDEBUGCODE(GrSingleOwner::AutoEnforce debug_SingleOwner(this->singleOwner());)
 #define RETURN_IF_ABANDONED        if (this->drawingManager()->abandoned()) { return; }
 
 void GrPathRenderingDrawContext::drawText(const GrClip& clip,  const GrPaint& grPaint,
                                           const SkPaint& skPaint,
                                           const SkMatrix& viewMatrix, const char text[],
                                           size_t byteLength, SkScalar x, SkScalar y,
                                           const SkIRect& clipBounds) {
     ASSERT_SINGLE_OWNER
     RETURN_IF_ABANDONED
     SkDEBUGCODE(this->validate();)
     GR_AUDIT_TRAIL_AUTO_FRAME(this->auditTrail(), "GrPathRenderingDrawContext::drawText");
 
     if (!fStencilAndCoverTextContext) {
-        fStencilAndCoverTextContext = GrStencilAndCoverTextContext::Create();
+        fStencilAndCoverTextContext.reset(GrStencilAndCoverTextContext::Create());
     }
 
     fStencilAndCoverTextContext->drawText(this->drawingManager()->getContext(), this, clip, grPaint,
                                           skPaint, viewMatrix, this->surfaceProps(),
                                           text, byteLength, x, y, clipBounds);
 }
 
 void GrPathRenderingDrawContext::drawPosText(const GrClip& clip, const GrPaint& grPaint,
                                              const SkPaint& skPaint,
                                              const SkMatrix& viewMatrix, const char text[],
                                              size_t byteLength,  const SkScalar pos[],
                                              int scalarsPerPosition, const SkPoint& offset,
                                              const SkIRect& clipBounds) {
     ASSERT_SINGLE_OWNER
     RETURN_IF_ABANDONED
     SkDEBUGCODE(this->validate();)
     GR_AUDIT_TRAIL_AUTO_FRAME(this->auditTrail(), "GrPathRenderingDrawContext::drawPosText");
 
     if (!fStencilAndCoverTextContext) {
-        fStencilAndCoverTextContext = GrStencilAndCoverTextContext::Create();
+        fStencilAndCoverTextContext.reset(GrStencilAndCoverTextContext::Create());
     }
 
     fStencilAndCoverTextContext->drawPosText(this->drawingManager()->getContext(), this, clip,
                                              grPaint, skPaint, viewMatrix, this->surfaceProps(),
                                              text, byteLength, pos, scalarsPerPosition, offset,
                                              clipBounds);
 }
 
 void GrPathRenderingDrawContext::drawTextBlob(const GrClip& clip, const SkPaint& skPaint,
                                               const SkMatrix& viewMatrix, const SkTextBlob* blob,
                                               SkScalar x, SkScalar y,
                                               SkDrawFilter* filter, const SkIRect& clipBounds) {
     ASSERT_SINGLE_OWNER
     RETURN_IF_ABANDONED
     SkDEBUGCODE(this->validate();)
     GR_AUDIT_TRAIL_AUTO_FRAME(this->auditTrail(), "GrPathRenderingDrawContext::drawTextBlob");
 
     if (!fStencilAndCoverTextContext) {
-        fStencilAndCoverTextContext = GrStencilAndCoverTextContext::Create();
+        fStencilAndCoverTextContext.reset(GrStencilAndCoverTextContext::Create());
     }
 
     fStencilAndCoverTextContext->drawTextBlob(this->drawingManager()->getContext(), this, clip,
                                               skPaint, viewMatrix, this->surfaceProps(), blob, x,
                                               y, filter, clipBounds);
 }