Give GrDrawTarget a back ptr to its owning GrContext.
Review URL: https://codereview.appspot.com/7395055

git-svn-id: http://skia.googlecode.com/svn/trunk@7850 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrClipMaskManager.cpp b/src/gpu/GrClipMaskManager.cpp
index 1bbb885..3bdb332 100644
--- a/src/gpu/GrClipMaskManager.cpp
+++ b/src/gpu/GrClipMaskManager.cpp
@@ -991,3 +991,8 @@
 void GrClipMaskManager::releaseResources() {
     fAACache.releaseResources();
 }
+
+void GrClipMaskManager::setGpu(GrGpu* gpu) {
+    fGpu = gpu;
+    fAACache.setContext(gpu->getContext());
+}