cc: Set requires high res upon becoming visible

cc/trees/layer_tree_host_impl_unittest.cc

 // Copyright 2011 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 "cc/trees/layer_tree_host_impl.h"
 
 #include <cmath>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 5722 matching lines @@
   host_impl_->SetVisible(true);
   host_impl_->SetMemoryPolicy(policy1);
   EXPECT_EQ(policy1.bytes_limit_when_visible, current_limit_bytes_);
   EXPECT_EQ(allow_nice_to_have_cutoff_value, current_priority_cutoff_value_);
 
   host_impl_->SetVisible(false);
   EXPECT_EQ(0u, current_limit_bytes_);
   EXPECT_EQ(nothing_cutoff_value, current_priority_cutoff_value_);
 }
 
+TEST_F(LayerTreeHostImplTest, RequireHighResWhenVisible) {
+  ASSERT_TRUE(host_impl_->active_tree());
+
+  EXPECT_FALSE(host_impl_->active_tree()->RequiresHighResToDraw());
+  host_impl_->SetVisible(false);
+  EXPECT_FALSE(host_impl_->active_tree()->RequiresHighResToDraw());
+  host_impl_->SetVisible(true);
+  EXPECT_TRUE(host_impl_->active_tree()->RequiresHighResToDraw());
+  host_impl_->SetVisible(false);
+  EXPECT_TRUE(host_impl_->active_tree()->RequiresHighResToDraw());
+
+  host_impl_->CreatePendingTree();
+  host_impl_->ActivatePendingTree();
+
+  EXPECT_FALSE(host_impl_->active_tree()->RequiresHighResToDraw());
+  host_impl_->SetVisible(true);
+  EXPECT_TRUE(host_impl_->active_tree()->RequiresHighResToDraw());
+}
+
 class LayerTreeHostImplTestManageTiles : public LayerTreeHostImplTest {
  public:
   virtual void SetUp() OVERRIDE {
     LayerTreeSettings settings;
     settings.impl_side_painting = true;
 
     fake_host_impl_ = new FakeLayerTreeHostImpl(
         settings, &proxy_, shared_bitmap_manager_.get());
     host_impl_.reset(fake_host_impl_);
     host_impl_->InitializeRenderer(CreateOutputSurface());
@@ skipping 814 matching lines @@
   FakePictureLayerImpl* active_mask_content =
       static_cast<FakePictureLayerImpl*>(
           host_impl_->active_tree()->root_layer()->children()[0]->mask_layer());
   gfx::Rect r2 = active_mask_content->visible_rect_for_tile_priority();
 
   ASSERT_TRUE(!r2.IsEmpty());
 }
 
 }  // namespace
 }  // namespace cc