Add support for creating texture backed images where Skia will delete the texture.

src/gpu/gl/GrGLRenderTarget.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef GrGLRenderTarget_DEFINED
 #define GrGLRenderTarget_DEFINED
@@ skipping 38 matching lines @@
             // catches FBO 0 and non MSAA case
             return kAutoResolves_ResolveType;
         } else if (kUnresolvableFBOID == fTexFBOID) {
             return kCantResolve_ResolveType;
         } else {
             return kCanResolve_ResolveType;
         }
     }
 
     /** When we don't own the FBO ID we don't attempt to modify its attachments. */
-    bool canAttemptStencilAttachment() const override { return !fIsWrapped; }
+    bool canAttemptStencilAttachment() const override {
+        return kCached_LifeCycle == fRTLifecycle || kUncached_LifeCycle == fRTLifecycle;
+    }
 
 protected:
     // The public constructor registers this object with the cache. However, only the most derived
     // class should register with the cache. This constructor does not do the registration and
     // rather moves that burden onto the derived class.
     enum Derived { kDerived };
     GrGLRenderTarget(GrGLGpu*, const GrSurfaceDesc&, const IDDesc&, Derived);
 
     void init(const GrSurfaceDesc&, const IDDesc&);
 
     void onAbandon() override;
     void onRelease() override;
 
     // In protected because subclass GrGLTextureRenderTarget calls this version.
     size_t onGpuMemorySize() const override;
 
 private:
-    GrGLuint      fRTFBOID;
-    GrGLuint      fTexFBOID;
-    GrGLuint      fMSColorRenderbufferID;
+    GrGLuint    fRTFBOID;
+    GrGLuint    fTexFBOID;
+    GrGLuint    fMSColorRenderbufferID;
 
     // We track this separately from GrGpuResource because this may be both a texture and a render
     // target, and the texture may be wrapped while the render target is not.
-    bool fIsWrapped;
+    LifeCycle   fRTLifecycle;
 
     // when we switch to this render target we want to set the viewport to
     // only render to content area (as opposed to the whole allocation) and
     // we want the rendering to be at top left (GL has origin in bottom left)
-    GrGLIRect fViewport;
+    GrGLIRect   fViewport;
 
     // onGpuMemorySize() needs to know the VRAM footprint of the FBO(s). However, abandon and
     // release zero out the IDs and the cache needs to know the size even after those actions.
-    size_t fGpuMemorySize;
+    size_t      fGpuMemorySize;
 
     typedef GrRenderTarget INHERITED;
 };
 
 #endif