DelegatedFrameHost: drop renderer frame on resize if hidden

content/browser/renderer_host/render_widget_host_view_aura_unittest.cc

Index: content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc b/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
index 4d1263d4de8b2a67544fd9df0e176e0590f6760c..49f017879e0281cd0663b6f2a41321aca12f4ed6 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
@@ -1575,6 +1575,19 @@ TEST_F(RenderWidgetHostViewAuraTest, DiscardDelegatedFrames) {
   views[0]->WasHidden();
   EXPECT_FALSE(views[0]->released_front_lock_active());
 
+  // Make [1] hidden, resize it. It should drop its frame.
+  views[1]->WasHidden();
+  EXPECT_TRUE(views[1]->frame_provider());
+  gfx::Size size2(200, 200);
+  views[1]->SetSize(size2);
+  EXPECT_FALSE(views[1]->frame_provider());
+  // Show it, it should block until we give it a frame.
+  views[1]->WasShown();
+  EXPECT_TRUE(views[1]->released_front_lock_active());
+  views[1]->OnSwapCompositorFrame(
+      1, MakeDelegatedFrame(1.f, size2, gfx::Rect(size2)));
+  EXPECT_FALSE(views[1]->released_front_lock_active());
+
   for (size_t i = 0; i < renderer_count - 1; ++i)
     views[i]->WasHidden();