Android: Don't hold frame lock during readback

content/browser/renderer_host/render_widget_host_view_android.cc

Index: content/browser/renderer_host/render_widget_host_view_android.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_android.cc b/content/browser/renderer_host/render_widget_host_view_android.cc
index 29121a6e41f07eb62faa8fb118d593939774ab42..e08b961c4f1e9c5881a337f43c35b0093bcb4237 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -910,9 +910,6 @@ void RenderWidgetHostViewAndroid::CopyFromCompositingSurface(
 
   if (!src_subrect_in_pixel.IsEmpty())
     request->set_area(src_subrect_in_pixel);
-  // Make sure the current frame doesn't get deleted until we fulfill the
-  // request.
-  LockCompositingSurface();
   surface_factory_->RequestCopyOfSurface(surface_id_, std::move(request));
 }
 
@@ -1919,8 +1916,6 @@ void RenderWidgetHostViewAndroid::PrepareTextureCopyOutputResult(
   TRACE_EVENT0("cc",
                "RenderWidgetHostViewAndroid::PrepareTextureCopyOutputResult");
   readback_layer->RemoveFromParent();
-  if (rwhva)
-    rwhva->UnlockCompositingSurface();
   if (!result->HasTexture() || result->IsEmpty() || result->size().IsEmpty())
     return;
   cc::TextureMailbox texture_mailbox;