Add debug-only helper methods to get #ops & #clips per opList

These are being/will be used to determine the correct amout of memory to preallocate for ops & clips in the opLists.

Change-Id: I98ebaec8a6e72a43d97101aca5fbc58264964ebd
Reviewed-on: https://skia-review.googlesource.com/15882
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/GrRenderTargetContext.cpp b/src/gpu/GrRenderTargetContext.cpp
index f81dc46..7de1f8d 100644
--- a/src/gpu/GrRenderTargetContext.cpp
+++ b/src/gpu/GrRenderTargetContext.cpp
@@ -127,7 +127,7 @@
     return fOpList.get();
 }
 
-// TODO: move this (and GrTextContext::copy) to GrSurfaceContext?
+// MDB TODO: move this (and GrTextContext::copy) to GrSurfaceContext?
 bool GrRenderTargetContext::onCopy(GrSurfaceProxy* srcProxy,
                                    const SkIRect& srcRect,
                                    const SkIPoint& dstPoint) {