Make a single GrSingleOwner in GrContext

src/gpu/GrContext.cpp

Index: src/gpu/GrContext.cpp
diff --git a/src/gpu/GrContext.cpp b/src/gpu/GrContext.cpp
index 854ff742f348934f90f4b66f08b90184c65d5fcc..2bf887c7f03411722e88b1ab93eb52331e93ddfe 100644
--- a/src/gpu/GrContext.cpp
+++ b/src/gpu/GrContext.cpp
@@ -95,7 +95,7 @@ void GrContext::initCommon(const GrContextOptions& options) {
     dtOptions.fClipBatchToBounds = options.fClipBatchToBounds;
     dtOptions.fDrawBatchBounds = options.fDrawBatchBounds;
     dtOptions.fMaxBatchLookback = options.fMaxBatchLookback;
-    fDrawingManager.reset(new GrDrawingManager(this, dtOptions));
+    fDrawingManager.reset(new GrDrawingManager(this, dtOptions, &fSingleOwner));
 
     // GrBatchFontCache will eventually replace GrFontCache
     fBatchFontCache = new GrBatchFontCache(this);