Remove GrTexture::releaseRenderTarget() and add GrSurface::isSameAs().

src/gpu/GrTexture.cpp

Index: src/gpu/GrTexture.cpp
===================================================================
--- src/gpu/GrTexture.cpp	(revision 8517)
+++ src/gpu/GrTexture.cpp	(working copy)
@@ -67,33 +67,15 @@
                                 pixelOpsFlags);
 }
 
-void GrTexture::releaseRenderTarget() {
-    if (NULL != fRenderTarget) {
-        GrAssert(fRenderTarget->asTexture() == this);
-        GrAssert(fDesc.fFlags & kRenderTarget_GrTextureFlagBit);
-
-        fRenderTarget->onTextureReleaseRenderTarget();
-        fRenderTarget->unref();
-        fRenderTarget = NULL;
-
-        fDesc.fFlags = fDesc.fFlags &
-            ~(kRenderTarget_GrTextureFlagBit|kNoStencil_GrTextureFlagBit);
-        fDesc.fSampleCnt = 0;
-    }
-}
-
 void GrTexture::onRelease() {
     GrAssert(!this->isSetFlag((GrTextureFlags) kReturnToCache_FlagBit));
-    this->releaseRenderTarget();
-
     INHERITED::onRelease();
 }
 
 void GrTexture::onAbandon() {
-    if (NULL != fRenderTarget) {
+    if (NULL != fRenderTarget.get()) {
         fRenderTarget->abandon();
     }
-
     INHERITED::onAbandon();
 }