DelegatedFrameHost: drop renderer frame on resize if hidden

content/browser/renderer_host/render_widget_host_view_aura_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/memory/shared_memory.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 1557 matching lines @@
   views[0]->WasHidden();
   EXPECT_FALSE(views[0]->frame_provider());
 
   // Make [0] visible, don't give it a frame, it should be waiting.
   views[0]->WasShown();
   EXPECT_TRUE(views[0]->released_front_lock_active());
   // Make [0] hidden, it should stop waiting.
   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();
 
   // Allocate enough bitmaps so that two frames (proportionally) would be
   // enough hit the handle limit.
   int handles_per_frame = 5;
   RendererFrameManager::GetInstance()->set_max_handles(handles_per_frame * 2);
 
   for (size_t i = 0; i < (renderer_count - 1) * handles_per_frame; i++) {
     HostSharedBitmapManager::current()->ChildAllocatedSharedBitmap(
@@ skipping 1116 matching lines @@
   EXPECT_EQ(OVERSCROLL_NONE, overscroll_delegate()->completed_mode());
 
   SimulateGestureEvent(WebInputEvent::GestureScrollEnd,
                        blink::WebGestureDeviceTouchscreen);
   EXPECT_EQ(OVERSCROLL_NONE, overscroll_delegate()->current_mode());
   EXPECT_EQ(OVERSCROLL_EAST, overscroll_delegate()->completed_mode());
   EXPECT_EQ(3U, sink_->message_count());
 }
 
 }  // namespace content