Part 2: WIP Refactor Webview graphics related code

android_webview/browser/browser_view_renderer_client.h

Index: android_webview/browser/browser_view_renderer_client.h
diff --git a/android_webview/browser/browser_view_renderer_client.h b/android_webview/browser/browser_view_renderer_client.h
index dfa5ff0ce7ab6f4e2da505c8a5b7d8818a772316..17d0dc4745eb8cdb35f85e283861c2730422c6ff 100644
--- a/android_webview/browser/browser_view_renderer_client.h
+++ b/android_webview/browser/browser_view_renderer_client.h
@@ -27,6 +27,10 @@ class BrowserViewRendererClient {
   // Called to trigger view invalidations.
   virtual void PostInvalidate() = 0;
 
+  // Call postInvalidateOnAnimation for invalidations. This is only used to
+  // synchronize draw functor destruction.
+  virtual void InvalidateOnFunctorDestroy() = 0;
+
   // Called to update the parent draw constraints in browser view renderer.
   virtual void UpdateParentDrawConstraints() = 0;