Add ability to uninstantiate lazy proxies after every flush.

Bug: skia:
Change-Id: Id32540cda54a9c5e3e6cb721776699be3cc8ac1a
Reviewed-on: https://skia-review.googlesource.com/113263
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/gn/gpu.gni b/gn/gpu.gni
index 86e2a03..457b405 100644
--- a/gn/gpu.gni
+++ b/gn/gpu.gni
@@ -225,6 +225,8 @@
   "$_src/gpu/GrTextureRenderTargetProxy.h",
   "$_src/gpu/GrTextureStripAtlas.h",
   "$_src/gpu/GrTRecorder.h",
+  "$_src/gpu/GrUninstantiateProxyTracker.cpp",
+  "$_src/gpu/GrUninstantiateProxyTracker.h",
   "$_src/gpu/GrUserStencilSettings.h",
   "$_src/gpu/GrWindowRectangles.h",
   "$_src/gpu/GrWindowRectsState.h",