Cache render targets that render to wrapped textures

src/gpu/GrGpu.cpp

Index: src/gpu/GrGpu.cpp
diff --git a/src/gpu/GrGpu.cpp b/src/gpu/GrGpu.cpp
index 57e033d8464cf490dd485b0b2bb23827d55a0cb6..df0fde879213e30b82cd603e613cc4b6a414775e 100644
--- a/src/gpu/GrGpu.cpp
+++ b/src/gpu/GrGpu.cpp
@@ -217,6 +217,27 @@ GrRenderTarget* GrGpu::wrapBackendRenderTarget(const GrBackendRenderTargetDesc&
     return this->onWrapBackendRenderTarget(desc, ownership);
 }
 
+void GrGpu::computeBackendTextureKeyForWrapAsRenderTarget(
+    const GrBackendTextureDesc& desc, GrUniqueKey* key) {
+    this->onComputeBackendTextureKeyForWrapAsRenderTarget(desc, key);
+}
+
+bool GrGpu::rewrapRenderTargetWithBackendTexture(
+    const GrBackendTextureDesc& desc, GrRenderTarget* rt) {
+    if (!(desc.fFlags & kRenderTarget_GrBackendTextureFlag)) {
+      return nullptr;
+    }
+    if (!this->caps()->isConfigRenderable(desc.fConfig, desc.fSampleCnt > 0)) {
+        return nullptr;
+    }
+    int maxSize = this->caps()->maxTextureSize();
+    if (desc.fWidth > maxSize || desc.fHeight > maxSize) {
+        return nullptr;
+    }
+    this->handleDirtyContext();
+    return this->onRewrapRenderTargetWithBackendTexture(desc, rt);
+}
+
 GrRenderTarget* GrGpu::wrapBackendTextureAsRenderTarget(const GrBackendTextureDesc& desc) {
     this->handleDirtyContext();
     if (!(desc.fFlags & kRenderTarget_GrBackendTextureFlag)) {