[cc] Make LayerImpls point at LayerTreeImpl instead of LTHI

cc/scrollbar_animation_controller_linear_fade_unittest.cc

 // Copyright 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 "cc/scrollbar_animation_controller_linear_fade.h"
 
 #include "cc/scrollbar_layer_impl.h"
 #include "cc/single_thread_proxy.h"
 #include "cc/test/fake_impl_proxy.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
 namespace {
 
 class ScrollbarAnimationControllerLinearFadeTest : public testing::Test {
 public:
     ScrollbarAnimationControllerLinearFadeTest()
         : m_hostImpl(&m_proxy)
     {
     }
 
 protected:
     virtual void SetUp()
     {
-        m_scrollLayer = LayerImpl::create(&m_hostImpl, 1);
-        m_scrollLayer->addChild(LayerImpl::create(&m_hostImpl, 2));
+        m_scrollLayer = LayerImpl::create(m_hostImpl.activeTree(), 1);
+        m_scrollLayer->addChild(LayerImpl::create(m_hostImpl.activeTree(), 2));
         m_contentLayer = m_scrollLayer->children()[0];
-        m_scrollbarLayer = ScrollbarLayerImpl::create(&m_hostImpl, 3);
+        m_scrollbarLayer = ScrollbarLayerImpl::create(m_hostImpl.activeTree(), 3);
 
         m_scrollLayer->setMaxScrollOffset(gfx::Vector2d(50, 50));
         m_contentLayer->setBounds(gfx::Size(50, 50));
 
         m_scrollbarController = ScrollbarAnimationControllerLinearFade::create(m_scrollLayer.get(), 2, 3);
         m_scrollbarController->setHorizontalScrollbarLayer(m_scrollbarLayer.get());
     }
 
     FakeImplProxy m_proxy;
     FakeLayerTreeHostImpl m_hostImpl;
@@ skipping 76 matching lines @@
     EXPECT_FLOAT_EQ(2 / 3.0f, m_scrollbarLayer->opacity());
     m_scrollbarController->animate(10);
     EXPECT_FLOAT_EQ(1 / 3.0f, m_scrollbarLayer->opacity());
     m_scrollbarController->animate(11);
     EXPECT_FLOAT_EQ(0, m_scrollbarLayer->opacity());
 
 }
 
 }  // namespace
 }  // namespace cc