Add GrOpList and rename GrDrawTarget to GrRenderTargetOpList

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=3910

Change-Id: I026aa26ecc61a0d002e98892dca728536259e8b1
Reviewed-on: https://skia-review.googlesource.com/3910
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/GrPipeline.h b/src/gpu/GrPipeline.h
index 845044f..6330de1 100644
--- a/src/gpu/GrPipeline.h
+++ b/src/gpu/GrPipeline.h
@@ -105,8 +105,8 @@
     ///////////////////////////////////////////////////////////////////////////
     /// @name GrFragmentProcessors
 
-    // Make the renderTarget's drawTarget (if it exists) be dependent on any
-    // drawTargets in this pipeline
+    // Make the renderTarget's GrOpList (if it exists) be dependent on any
+    // GrOpLists in this pipeline
     void addDependenciesTo(GrRenderTarget* rt) const;
 
     int numColorFragmentProcessors() const { return fNumColorProcessors; }