Switch GrGpu's GrResource list over to using SkTDLinkedList

https://codereview.appspot.com/6500062/



git-svn-id: http://skia.googlecode.com/svn/trunk@5379 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrGpu.h b/src/gpu/GrGpu.h
index fb5c1f5..60e49e7 100644
--- a/src/gpu/GrGpu.h
+++ b/src/gpu/GrGpu.h
@@ -554,7 +554,8 @@
 
     bool                        fContextIsDirty;
 
-    GrResource*                 fResourceHead;
+    typedef SkTDLinkedList<GrResource> ResourceList;
+    ResourceList                fResourceList;
 
     // Given a rt, find or create a stencil buffer and attach it
     bool attachStencilBufferToRenderTarget(GrRenderTarget* target);