Add wrapBackendTextureAsRenderTarget API

src/gpu/GrGpu.cpp

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGpu.h"
 
@@ skipping 171 matching lines @@
 
 GrRenderTarget* GrGpu::wrapBackendRenderTarget(const GrBackendRenderTargetDesc& desc,
                                                GrWrapOwnership ownership) {
     if (!this->caps()->isConfigRenderable(desc.fConfig, desc.fSampleCnt > 0)) {
         return nullptr;
     }
     this->handleDirtyContext();
     return this->onWrapBackendRenderTarget(desc, ownership);
 }
 
+GrRenderTarget* GrGpu::wrapBackendTextureAsRenderTarget(const GrBackendTextureDesc& desc,
+                                                        GrWrapOwnership ownership) {
+    this->handleDirtyContext();
+    if (!(desc.fFlags & kRenderTarget_GrBackendTextureFlag)) {
+      return nullptr;
+    }
+    if (!this->caps()->isConfigRenderable(desc.fConfig, desc.fSampleCnt > 0)) {
+        return nullptr;
+    }
+    return this->onWrapBackendTextureAsRenderTarget(desc, ownership);
+}
+
 GrVertexBuffer* GrGpu::createVertexBuffer(size_t size, bool dynamic) {
     this->handleDirtyContext();
     GrVertexBuffer* vb = this->onCreateVertexBuffer(size, dynamic);
     if (!this->caps()->reuseScratchBuffers()) {
         vb->resourcePriv().removeScratchKey();
     }
     return vb;
 }
 
 GrIndexBuffer* GrGpu::createIndexBuffer(size_t size, bool dynamic) {
@@ skipping 176 matching lines @@
     }
 
     GrVertices::Iterator iter;
     const GrNonInstancedVertices* verts = iter.init(vertices);
     do {
         this->onDraw(args, *verts);
         fStats.incNumDraws();
     } while ((verts = iter.next()));
 }