Some fixes around GrContext::abandonContext:

src/gpu/GrContext.cpp

Index: src/gpu/GrContext.cpp
diff --git a/src/gpu/GrContext.cpp b/src/gpu/GrContext.cpp
index 6a35ed9d26fc78aa7fcd1c7d2dd765306589a1b2..55a9ccf2a819c03f29c76c63a461590bdb078970 100755
--- a/src/gpu/GrContext.cpp
+++ b/src/gpu/GrContext.cpp
@@ -516,7 +516,9 @@ void GrContext::addExistingTextureToCache(GrTexture* texture) {
 
     // Conceptually, the cache entry is going to assume responsibility
     // for the creation ref. Assert refcnt == 1.
-    SkASSERT(texture->unique());
+    // Except that this also gets called when the texture is prematurely
+    // abandoned. In that case the ref count may be > 1.
+    // SkASSERT(texture->unique());
 
     if (fGpu->caps()->reuseScratchTextures() || NULL != texture->asRenderTarget()) {
         // Since this texture came from an AutoScratchTexture it should