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

src/gpu/gl/GrGLRenderTarget.cpp

Index: src/gpu/gl/GrGLRenderTarget.cpp
diff --git a/src/gpu/gl/GrGLRenderTarget.cpp b/src/gpu/gl/GrGLRenderTarget.cpp
index a89022e27cc3454dfc2c0b9ff21f251a01cecd4c..e93c5c100be2a206756e107c675acd10d4bfe072 100644
--- a/src/gpu/gl/GrGLRenderTarget.cpp
+++ b/src/gpu/gl/GrGLRenderTarget.cpp
@@ -31,7 +31,7 @@ void GrGLRenderTarget::init(const GrSurfaceDesc& desc, const IDDesc& idDesc) {
     fRTFBOID                = idDesc.fRTFBOID;
     fTexFBOID               = idDesc.fTexFBOID;
     fMSColorRenderbufferID  = idDesc.fMSColorRenderbufferID;
-    fIsWrapped              = kWrapped_LifeCycle == idDesc.fLifeCycle;
+    fRTLifecycle            = idDesc.fLifeCycle;
 
     fViewport.fLeft   = 0;
     fViewport.fBottom = 0;
@@ -59,7 +59,7 @@ size_t GrGLRenderTarget::onGpuMemorySize() const {
 }
 
 void GrGLRenderTarget::onRelease() {
-    if (!fIsWrapped) {
+    if (kBorrowed_LifeCycle != fRTLifecycle) {
         if (fTexFBOID) {
             GL_CALL(DeleteFramebuffers(1, &fTexFBOID));
         }
@@ -73,7 +73,6 @@ void GrGLRenderTarget::onRelease() {
     fRTFBOID                = 0;
     fTexFBOID               = 0;
     fMSColorRenderbufferID  = 0;
-    fIsWrapped              = false;
     INHERITED::onRelease();
 }
 
@@ -81,6 +80,5 @@ void GrGLRenderTarget::onAbandon() {
     fRTFBOID                = 0;
     fTexFBOID               = 0;
     fMSColorRenderbufferID  = 0;
-    fIsWrapped              = false;
     INHERITED::onAbandon();
 }