Revert of Remove ForceReclaimResources

ui/compositor/layer_unittest.cc

Index: ui/compositor/layer_unittest.cc
diff --git a/ui/compositor/layer_unittest.cc b/ui/compositor/layer_unittest.cc
index e518ba51d8ad52018e643736b70f4211a47c91da..8f674a6916c2f439962b3c071ae41cfcf6065cf5 100644
--- a/ui/compositor/layer_unittest.cc
+++ b/ui/compositor/layer_unittest.cc
@@ -1156,13 +1156,9 @@
   WaitForCommit();
   EXPECT_TRUE(root->damaged_region_for_testing().IsEmpty());
 
-  // The texture mailbox has a reference from an in-flight texture layer.
-  // We clear the texture mailbox from the root layer and draw a new frame
-  // to ensure that the texture mailbox is released. We then draw a second
-  // frame to ensure that the mailbox's release callback has time to run.
-  root->SetShowSolidColorContent();
-  Draw();
-  Draw();
+  compositor()->SetRootLayer(nullptr);
+  root.reset();
+  WaitForCommit();
 }
 
 void ExpectRgba(int x, int y, SkColor expected_color, SkColor actual_color) {