cc : Fix transform calculation bug while calculating clip rects

cc/trees/layer_tree_host_common_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_common.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 10119 matching lines @@
 
   root->SetBounds(gfx::Size(100, 100));
   clip_layer->SetBounds(gfx::Size(20, 20));
   clip_layer->SetMasksToBounds(true);
   clip_parent->SetBounds(gfx::Size(50, 50));
   unclipped_desc_surface->SetBounds(gfx::Size(100, 100));
   unclipped_desc_surface->SetDrawsContent(true);
   unclipped_desc_surface->test_properties()->force_render_surface = true;
   clip_child->SetBounds(gfx::Size(100, 100));
   clip_child->SetDrawsContent(true);
+  gfx::Transform translate;
+  translate.Translate(10, 10);
+  unclipped_desc_surface->test_properties()->transform = translate;
 
   clip_child->test_properties()->clip_parent = clip_parent;
   clip_parent->test_properties()->clip_children =
       base::MakeUnique<std::set<LayerImpl*>>();
   clip_parent->test_properties()->clip_children->insert(clip_child);
 
   float device_scale_factor = 1.f;
   ExecuteCalculateDrawProperties(root, device_scale_factor);
-  EXPECT_EQ(gfx::Rect(20, 20), clip_child->clip_rect());
-  EXPECT_EQ(gfx::Rect(20, 20), clip_child->visible_layer_rect());
+  EXPECT_EQ(gfx::Rect(-10, -10, 20, 20), clip_child->clip_rect());
+  EXPECT_EQ(gfx::Rect(10, 10), clip_child->visible_layer_rect());
 
   device_scale_factor = 2.f;
   ExecuteCalculateDrawProperties(root, device_scale_factor);
-  EXPECT_EQ(gfx::Rect(40, 40), clip_child->clip_rect());
-  EXPECT_EQ(gfx::Rect(20, 20), clip_child->visible_layer_rect());
+  EXPECT_EQ(gfx::Rect(-20, -20, 40, 40), clip_child->clip_rect());
+  EXPECT_EQ(gfx::Rect(10, 10), clip_child->visible_layer_rect());
 }
 
 TEST_F(LayerTreeHostCommonTest, ClipChildVisibleRect) {
   LayerImpl* root = root_layer_for_testing();
   LayerImpl* clip_parent = AddChildToRoot<LayerImpl>();
   LayerImpl* render_surface = AddChild<LayerImpl>(clip_parent);
   LayerImpl* clip_child = AddChild<LayerImpl>(render_surface);
 
   root->SetBounds(gfx::Size(30, 30));
   clip_parent->SetBounds(gfx::Size(40, 40));
@@ skipping 593 matching lines @@
   EXPECT_EQ(scroll_child6.id, grand_child10->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, parent3->scroll_tree_index());
   EXPECT_EQ(scroll_child7.id, child8->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, parent4->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, child9->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, grand_child12->scroll_tree_index());
 }
 
 }  // namespace
 }  // namespace cc