[cc] Store CCLayerImpls as scoped_ptrs

cc/CCLayerTreeHostImplTest.cpp

 // 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 "config.h"
 
 #include "CCLayerTreeHostImpl.h"
 
 #include "CCAnimationTestCommon.h"
 #include "CCDelegatedRendererLayerImpl.h"
@@ skipping 56 matching lines @@
 
     virtual void didLoseContextOnImplThread() OVERRIDE { }
     virtual void onSwapBuffersCompleteOnImplThread() OVERRIDE { }
     virtual void onVSyncParametersChanged(double, double) OVERRIDE { }
     virtual void onCanDrawStateChanged(bool canDraw) OVERRIDE { m_onCanDrawStateChangedCalled = true; }
     virtual void setNeedsRedrawOnImplThread() OVERRIDE { m_didRequestRedraw = true; }
     virtual void setNeedsCommitOnImplThread() OVERRIDE { m_didRequestCommit = true; }
     virtual void postAnimationEventsToMainThreadOnImplThread(scoped_ptr<CCAnimationEventsVector>, double wallClockTime) OVERRIDE { }
     virtual void releaseContentsTexturesOnImplThread() OVERRIDE { }
 
-    scoped_ptr<CCLayerTreeHostImpl> createLayerTreeHost(bool partialSwap, scoped_ptr<CCGraphicsContext> graphicsContext, PassOwnPtr<CCLayerImpl> rootPtr)
+    scoped_ptr<CCLayerTreeHostImpl> createLayerTreeHost(bool partialSwap, scoped_ptr<CCGraphicsContext> graphicsContext, scoped_ptr<CCLayerImpl> root)
     {
         CCSettings::setPartialSwapEnabled(partialSwap);
 
         CCLayerTreeSettings settings;
         settings.minimumOcclusionTrackingSize = IntSize();
 
         scoped_ptr<CCLayerTreeHostImpl> myHostImpl = CCLayerTreeHostImpl::create(settings, this);
 
         myHostImpl->initializeRenderer(graphicsContext.Pass());
         myHostImpl->setViewportSize(IntSize(10, 10), IntSize(10, 10));
 
-        OwnPtr<CCLayerImpl> root = rootPtr;
-
         root->setAnchorPoint(FloatPoint(0, 0));
         root->setPosition(FloatPoint(0, 0));
         root->setBounds(IntSize(10, 10));
         root->setContentBounds(IntSize(10, 10));
         root->setVisibleContentRect(IntRect(0, 0, 10, 10));
         root->setDrawsContent(true);
-        myHostImpl->setRootLayer(root.release());
+        myHostImpl->setRootLayer(root.Pass());
         return myHostImpl.Pass();
     }
 
     static void expectClearedScrollDeltasRecursive(CCLayerImpl* layer)
     {
         ASSERT_EQ(layer->scrollDelta(), IntSize());
         for (size_t i = 0; i < layer->children().size(); ++i)
             expectClearedScrollDeltasRecursive(layer->children()[i]);
     }
 
     static void expectContains(const CCScrollAndScaleSet& scrollInfo, int id, const IntSize& scrollDelta)
     {
         int timesEncountered = 0;
 
         for (size_t i = 0; i < scrollInfo.scrolls.size(); ++i) {
             if (scrollInfo.scrolls[i].layerId != id)
                 continue;
             EXPECT_EQ(scrollDelta.width(), scrollInfo.scrolls[i].scrollDelta.width());
             EXPECT_EQ(scrollDelta.height(), scrollInfo.scrolls[i].scrollDelta.height());
             timesEncountered++;
         }
 
         ASSERT_EQ(timesEncountered, 1);
     }
 
     void setupScrollAndContentsLayers(const IntSize& contentSize)
     {
-        OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
+        scoped_ptr<CCLayerImpl> root = CCLayerImpl::create(1);
         root->setScrollable(true);
         root->setScrollPosition(IntPoint(0, 0));
         root->setMaxScrollPosition(contentSize);
         root->setBounds(contentSize);
         root->setContentBounds(contentSize);
         root->setPosition(FloatPoint(0, 0));
         root->setAnchorPoint(FloatPoint(0, 0));
 
-        OwnPtr<CCLayerImpl> contents = CCLayerImpl::create(2);
+        scoped_ptr<CCLayerImpl> contents = CCLayerImpl::create(2);
         contents->setDrawsContent(true);
         contents->setBounds(contentSize);
         contents->setContentBounds(contentSize);
         contents->setPosition(FloatPoint(0, 0));
         contents->setAnchorPoint(FloatPoint(0, 0));
-        root->addChild(contents.release());
-        m_hostImpl->setRootLayer(root.release());
+        root->addChild(contents.Pass());
+        m_hostImpl->setRootLayer(root.Pass());
     }
 
-    static PassOwnPtr<CCLayerImpl> createScrollableLayer(int id, const IntSize& size)
+    static scoped_ptr<CCLayerImpl> createScrollableLayer(int id, const IntSize& size)
     {
-        OwnPtr<CCLayerImpl> layer = CCLayerImpl::create(id);
+        scoped_ptr<CCLayerImpl> layer = CCLayerImpl::create(id);
         layer->setScrollable(true);
         layer->setDrawsContent(true);
         layer->setBounds(size);
         layer->setContentBounds(size);
         layer->setMaxScrollPosition(IntSize(size.width() * 2, size.height() * 2));
-        return layer.release();
+        return layer.Pass();
     }
 
     void initializeRendererAndDrawFrame()
     {
         m_hostImpl->initializeRenderer(createContext());
         CCLayerTreeHostImpl::FrameData frame;
         EXPECT_TRUE(m_hostImpl->prepareToDraw(frame));
         m_hostImpl->drawLayers(frame);
         m_hostImpl->didDrawAllLayers(frame);
     }
@@ skipping 26 matching lines @@
     // that canDraw changed.
     EXPECT_FALSE(m_hostImpl->canDraw());
     m_onCanDrawStateChangedCalled = false;
 
     setupScrollAndContentsLayers(IntSize(100, 100));
     EXPECT_TRUE(m_hostImpl->canDraw());
     EXPECT_TRUE(m_onCanDrawStateChangedCalled);
     m_onCanDrawStateChangedCalled = false;
 
     // Toggle the root layer to make sure it toggles canDraw
-    m_hostImpl->setRootLayer(adoptPtr<CCLayerImpl>(0));
+    m_hostImpl->setRootLayer(scoped_ptr<CCLayerImpl>());
     EXPECT_FALSE(m_hostImpl->canDraw());
     EXPECT_TRUE(m_onCanDrawStateChangedCalled);
     m_onCanDrawStateChangedCalled = false;
 
     setupScrollAndContentsLayers(IntSize(100, 100));
     EXPECT_TRUE(m_hostImpl->canDraw());
     EXPECT_TRUE(m_onCanDrawStateChangedCalled);
     m_onCanDrawStateChangedCalled = false;
 
     // Toggle the device viewport size to make sure it toggles canDraw.
@@ skipping 23 matching lines @@
 {
     ASSERT_FALSE(m_hostImpl->rootLayer());
 
     OwnPtr<CCScrollAndScaleSet> scrollInfo = m_hostImpl->processScrollDeltas();
     ASSERT_EQ(scrollInfo->scrolls.size(), 0u);
 }
 
 TEST_F(CCLayerTreeHostImplTest, scrollDeltaTreeButNoChanges)
 {
     {
-        OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
+        scoped_ptr<CCLayerImpl> root = CCLayerImpl::create(1);
         root->addChild(CCLayerImpl::create(2));
         root->addChild(CCLayerImpl::create(3));
         root->children()[1]->addChild(CCLayerImpl::create(4));
         root->children()[1]->addChild(CCLayerImpl::create(5));
         root->children()[1]->children()[0]->addChild(CCLayerImpl::create(6));
-        m_hostImpl->setRootLayer(root.release());
+        m_hostImpl->setRootLayer(root.Pass());
     }
     CCLayerImpl* root = m_hostImpl->rootLayer();
 
     expectClearedScrollDeltasRecursive(root);
 
     OwnPtr<CCScrollAndScaleSet> scrollInfo;
 
     scrollInfo = m_hostImpl->processScrollDeltas();
     ASSERT_EQ(scrollInfo->scrolls.size(), 0u);
     expectClearedScrollDeltasRecursive(root);
 
     scrollInfo = m_hostImpl->processScrollDeltas();
     ASSERT_EQ(scrollInfo->scrolls.size(), 0u);
     expectClearedScrollDeltasRecursive(root);
 }
 
 TEST_F(CCLayerTreeHostImplTest, scrollDeltaRepeatedScrolls)
 {
     IntPoint scrollPosition(20, 30);
     IntSize scrollDelta(11, -15);
     {
-        OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
+        scoped_ptr<CCLayerImpl> root = CCLayerImpl::create(1);
         root->setScrollPosition(scrollPosition);
         root->setScrollable(true);
         root->setMaxScrollPosition(IntSize(100, 100));
         root->scrollBy(scrollDelta);
-        m_hostImpl->setRootLayer(root.release());
+        m_hostImpl->setRootLayer(root.Pass());
     }
     CCLayerImpl* root = m_hostImpl->rootLayer();
 
     OwnPtr<CCScrollAndScaleSet> scrollInfo;
 
     scrollInfo = m_hostImpl->processScrollDeltas();
     ASSERT_EQ(scrollInfo->scrolls.size(), 1u);
     EXPECT_EQ(root->sentScrollDelta(), scrollDelta);
     expectContains(*scrollInfo, root->id(), scrollDelta);
 
@@ skipping 386 matching lines @@
     // The final page scale and scroll deltas should match what we got
     // earlier.
     m_hostImpl->animate(endTime, endTime);
     scrollInfo = m_hostImpl->processScrollDeltas();
     EXPECT_EQ(scrollInfo->pageScaleDelta, pageScaleDelta);
     expectContains(*scrollInfo, scrollLayer->id(), IntSize(25, 25));
 }
 
 class DidDrawCheckLayer : public CCTiledLayerImpl {
 public:
-    static PassOwnPtr<DidDrawCheckLayer> create(int id) { return adoptPtr(new DidDrawCheckLayer(id)); }
+    static scoped_ptr<CCLayerImpl> create(int id) { return scoped_ptr<CCLayerImpl>(new DidDrawCheckLayer(id)); }
 
     virtual void didDraw(CCResourceProvider*) OVERRIDE
     {
         m_didDrawCalled = true;
     }
 
     virtual void willDraw(CCResourceProvider*) OVERRIDE
     {
         m_willDrawCalled = true;
     }
@@ skipping 136 matching lines @@
     EXPECT_TRUE(root->didDrawCalled());
     EXPECT_TRUE(layer1->didDrawCalled());
     EXPECT_TRUE(layer2->didDrawCalled());
 
     EXPECT_NE(root->renderSurface(), layer1->renderSurface());
     EXPECT_TRUE(!!layer1->renderSurface());
 }
 
 class MissingTextureAnimatingLayer : public DidDrawCheckLayer {
 public:
-    static PassOwnPtr<MissingTextureAnimatingLayer> create(int id, bool tileMissing, bool skipsDraw, bool animating, CCResourceProvider* resourceProvider) { return adoptPtr(new MissingTextureAnimatingLayer(id, tileMissing, skipsDraw, animating, resourceProvider)); }
+    static scoped_ptr<CCLayerImpl> create(int id, bool tileMissing, bool skipsDraw, bool animating, CCResourceProvider* resourceProvider)
+    {
+        return scoped_ptr<CCLayerImpl>(new MissingTextureAnimatingLayer(id, tileMissing, skipsDraw, animating, resourceProvider));
+    }
 
 private:
     explicit MissingTextureAnimatingLayer(int id, bool tileMissing, bool skipsDraw, bool animating, CCResourceProvider* resourceProvider)
         : DidDrawCheckLayer(id)
     {
         OwnPtr<CCLayerTilingData> tilingData = CCLayerTilingData::create(IntSize(10, 10), CCLayerTilingData::NoBorderTexels);
         tilingData->setBounds(bounds());
         setTilingData(*tilingData.get());
         setSkipsDraw(skipsDraw);
         if (!tileMissing) {
@@ skipping 41 matching lines @@
     root = static_cast<DidDrawCheckLayer*>(m_hostImpl->rootLayer());
     root->addChild(MissingTextureAnimatingLayer::create(2, false, true, true, m_hostImpl->resourceProvider()));
 
     EXPECT_TRUE(m_hostImpl->prepareToDraw(frame));
     m_hostImpl->drawLayers(frame);
     m_hostImpl->didDrawAllLayers(frame);
 }
 
 TEST_F(CCLayerTreeHostImplTest, scrollRootIgnored)
 {
-    OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
+    scoped_ptr<CCLayerImpl> root = CCLayerImpl::create(1);
     root->setScrollable(false);
-    m_hostImpl->setRootLayer(root.release());
+    m_hostImpl->setRootLayer(root.Pass());
     initializeRendererAndDrawFrame();
 
     // Scroll event is ignored because layer is not scrollable.
     EXPECT_EQ(m_hostImpl->scrollBegin(IntPoint(0, 0), CCInputHandlerClient::Wheel), CCInputHandlerClient::ScrollIgnored);
     EXPECT_FALSE(m_didRequestRedraw);
     EXPECT_FALSE(m_didRequestCommit);
 }
 
 TEST_F(CCLayerTreeHostImplTest, scrollNonCompositedRoot)
 {
     // Test the configuration where a non-composited root layer is embedded in a
     // scrollable outer layer.
     IntSize surfaceSize(10, 10);
 
-    OwnPtr<CCLayerImpl> contentLayer = CCLayerImpl::create(1);
+    scoped_ptr<CCLayerImpl> contentLayer = CCLayerImpl::create(1);
     contentLayer->setUseLCDText(true);
     contentLayer->setDrawsContent(true);
     contentLayer->setPosition(FloatPoint(0, 0));
     contentLayer->setAnchorPoint(FloatPoint(0, 0));
     contentLayer->setBounds(surfaceSize);
     contentLayer->setContentBounds(IntSize(surfaceSize.width() * 2, surfaceSize.height() * 2));
 
-    OwnPtr<CCLayerImpl> scrollLayer = CCLayerImpl::create(2);
+    scoped_ptr<CCLayerImpl> scrollLayer = CCLayerImpl::create(2);
     scrollLayer->setScrollable(true);
     scrollLayer->setMaxScrollPosition(surfaceSize);
     scrollLayer->setBounds(surfaceSize);
     scrollLayer->setContentBounds(surfaceSize);
     scrollLayer->setPosition(FloatPoint(0, 0));
     scrollLayer->setAnchorPoint(FloatPoint(0, 0));
-    scrollLayer->addChild(contentLayer.release());
+    scrollLayer->addChild(contentLayer.Pass());
 
-    m_hostImpl->setRootLayer(scrollLayer.release());
+    m_hostImpl->setRootLayer(scrollLayer.Pass());
     m_hostImpl->setViewportSize(surfaceSize, surfaceSize);
     initializeRendererAndDrawFrame();
 
     EXPECT_EQ(m_hostImpl->scrollBegin(IntPoint(5, 5), CCInputHandlerClient::Wheel), CCInputHandlerClient::ScrollStarted);
     m_hostImpl->scrollBy(IntPoint(), IntSize(0, 10));
     m_hostImpl->scrollEnd();
     EXPECT_TRUE(m_didRequestRedraw);
     EXPECT_TRUE(m_didRequestCommit);
 }
 
 TEST_F(CCLayerTreeHostImplTest, scrollChildCallsCommitAndRedraw)
 {
     IntSize surfaceSize(10, 10);
-    OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
+    scoped_ptr<CCLayerImpl> root = CCLayerImpl::create(1);
     root->setBounds(surfaceSize);
     root->setContentBounds(surfaceSize);
     root->addChild(createScrollableLayer(2, surfaceSize));
-    m_hostImpl->setRootLayer(root.release());
+    m_hostImpl->setRootLayer(root.Pass());
     m_hostImpl->setViewportSize(surfaceSize, surfaceSize);
     initializeRendererAndDrawFrame();
 
     EXPECT_EQ(m_hostImpl->scrollBegin(IntPoint(5, 5), CCInputHandlerClient::Wheel), CCInputHandlerClient::ScrollStarted);
     m_hostImpl->scrollBy(IntPoint(), IntSize(0, 10));
     m_hostImpl->scrollEnd();
     EXPECT_TRUE(m_didRequestRedraw);
     EXPECT_TRUE(m_didRequestCommit);
 }
 
 TEST_F(CCLayerTreeHostImplTest, scrollMissesChild)
 {
     IntSize surfaceSize(10, 10);
-    OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
+    scoped_ptr<CCLayerImpl> root = CCLayerImpl::create(1);
     root->addChild(createScrollableLayer(2, surfaceSize));
-    m_hostImpl->setRootLayer(root.release());
+    m_hostImpl->setRootLayer(root.Pass());
     m_hostImpl->setViewportSize(surfaceSize, surfaceSize);
     initializeRendererAndDrawFrame();
 
     // Scroll event is ignored because the input coordinate is outside the layer boundaries.
     EXPECT_EQ(m_hostImpl->scrollBegin(IntPoint(15, 5), CCInputHandlerClient::Wheel), CCInputHandlerClient::ScrollIgnored);
     EXPECT_FALSE(m_didRequestRedraw);
     EXPECT_FALSE(m_didRequestCommit);
 }
 
 TEST_F(CCLayerTreeHostImplTest, scrollMissesBackfacingChild)
 {
     IntSize surfaceSize(10, 10);
-    OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
-    OwnPtr<CCLayerImpl> child = createScrollableLayer(2, surfaceSize);
+    scoped_ptr<CCLayerImpl> root = CCLayerImpl::create(1);
+    scoped_ptr<CCLayerImpl> child = createScrollableLayer(2, surfaceSize);
     m_hostImpl->setViewportSize(surfaceSize, surfaceSize);
 
     WebTransformationMatrix matrix;
     matrix.rotate3d(180, 0, 0);
     child->setTransform(matrix);
     child->setDoubleSided(false);
 
-    root->addChild(child.release());
-    m_hostImpl->setRootLayer(root.release());
+    root->addChild(child.Pass());
+    m_hostImpl->setRootLayer(root.Pass());
     initializeRendererAndDrawFrame();
 
     // Scroll event is ignored because the scrollable layer is not facing the viewer and there is
     // nothing scrollable behind it.
     EXPECT_EQ(m_hostImpl->scrollBegin(IntPoint(5, 5), CCInputHandlerClient::Wheel), CCInputHandlerClient::ScrollIgnored);
     EXPECT_FALSE(m_didRequestRedraw);
     EXPECT_FALSE(m_didRequestCommit);
 }
 
 TEST_F(CCLayerTreeHostImplTest, scrollBlockedByContentLayer)
 {
     IntSize surfaceSize(10, 10);
-    OwnPtr<CCLayerImpl> contentLayer = createScrollableLayer(1, surfaceSize);
+    scoped_ptr<CCLayerImpl> contentLayer = createScrollableLayer(1, surfaceSize);
     contentLayer->setShouldScrollOnMainThread(true);
     contentLayer->setScrollable(false);
 
-    OwnPtr<CCLayerImpl> scrollLayer = createScrollableLayer(2, surfaceSize);
-    scrollLayer->addChild(contentLayer.release());
+    scoped_ptr<CCLayerImpl> scrollLayer = createScrollableLayer(2, surfaceSize);
+    scrollLayer->addChild(contentLayer.Pass());
 
-    m_hostImpl->setRootLayer(scrollLayer.release());
+    m_hostImpl->setRootLayer(scrollLayer.Pass());
     m_hostImpl->setViewportSize(surfaceSize, surfaceSize);
     initializeRendererAndDrawFrame();
 
     // Scrolling fails because the content layer is asking to be scrolled on the main thread.
     EXPECT_EQ(m_hostImpl->scrollBegin(IntPoint(5, 5), CCInputHandlerClient::Wheel), CCInputHandlerClient::ScrollOnMainThread);
 }
 
 TEST_F(CCLayerTreeHostImplTest, scrollRootAndChangePageScaleOnMainThread)
 {
     IntSize surfaceSize(10, 10);
     float pageScale = 2;
-    OwnPtr<CCLayerImpl> root = createScrollableLayer(1, surfaceSize);
-    m_hostImpl->setRootLayer(root.release());
+    scoped_ptr<CCLayerImpl> root = createScrollableLayer(1, surfaceSize);
+    m_hostImpl->setRootLayer(root.Pass());
     m_hostImpl->setViewportSize(surfaceSize, surfaceSize);
     initializeRendererAndDrawFrame();
 
     IntSize scrollDelta(0, 10);
     IntSize expectedScrollDelta(scrollDelta);
     IntSize expectedMaxScroll(m_hostImpl->rootLayer()->maxScrollPosition());
     EXPECT_EQ(m_hostImpl->scrollBegin(IntPoint(5, 5), CCInputHandlerClient::Wheel), CCInputHandlerClient::ScrollStarted);
     m_hostImpl->scrollBy(IntPoint(), scrollDelta);
     m_hostImpl->scrollEnd();
 
     // Set new page scale from main thread.
     m_hostImpl->setPageScaleFactorAndLimits(pageScale, pageScale, pageScale);
 
     // The scale should apply to the scroll delta.
     expectedScrollDelta.scale(pageScale);
     OwnPtr<CCScrollAndScaleSet> scrollInfo = m_hostImpl->processScrollDeltas();
     expectContains(*scrollInfo.get(), m_hostImpl->rootLayer()->id(), expectedScrollDelta);
 
     // The scroll range should also have been updated.
     EXPECT_EQ(m_hostImpl->rootLayer()->maxScrollPosition(), expectedMaxScroll);
 
     // The page scale delta remains constant because the impl thread did not scale.
     EXPECT_EQ(m_hostImpl->rootLayer()->pageScaleDelta(), 1);
 }
 
 TEST_F(CCLayerTreeHostImplTest, scrollRootAndChangePageScaleOnImplThread)
 {
     IntSize surfaceSize(10, 10);
     float pageScale = 2;
-    OwnPtr<CCLayerImpl> root = createScrollableLayer(1, surfaceSize);
-    m_hostImpl->setRootLayer(root.release());
+    scoped_ptr<CCLayerImpl> root = createScrollableLayer(1, surfaceSize);
+    m_hostImpl->setRootLayer(root.Pass());
     m_hostImpl->setViewportSize(surfaceSize, surfaceSize);
     m_hostImpl->setPageScaleFactorAndLimits(1, 1, pageScale);
     initializeRendererAndDrawFrame();
 
     IntSize scrollDelta(0, 10);
     IntSize expectedScrollDelta(scrollDelta);
     IntSize expectedMaxScroll(m_hostImpl->rootLayer()->maxScrollPosition());
     EXPECT_EQ(m_hostImpl->scrollBegin(IntPoint(5, 5), CCInputHandlerClient::Wheel), CCInputHandlerClient::ScrollStarted);
     m_hostImpl->scrollBy(IntPoint(), scrollDelta);
     m_hostImpl->scrollEnd();
@@ skipping 18 matching lines @@
 {
     IntSize surfaceSize(10, 10);
     float defaultPageScale = 1;
     float newPageScale = 2;
 
     // Create a normal scrollable root layer and another scrollable child layer.
     setupScrollAndContentsLayers(surfaceSize);
     CCLayerImpl* root = m_hostImpl->rootLayer();
     CCLayerImpl* child = root->children()[0];
 
-    OwnPtr<CCLayerImpl> scrollableChild = createScrollableLayer(3, surfaceSize);
-    child->addChild(scrollableChild.release());
+    scoped_ptr<CCLayerImpl> scrollableChild = createScrollableLayer(3, surfaceSize);
+    child->addChild(scrollableChild.Pass());
     CCLayerImpl* grandChild = child->children()[0];
 
     // Set new page scale on impl thread by pinching.
     m_hostImpl->pinchGestureBegin();
     m_hostImpl->pinchGestureUpdate(newPageScale, IntPoint());
     m_hostImpl->pinchGestureEnd();
 
     // The page scale delta should only be applied to the scrollable root layer.
     EXPECT_EQ(root->pageScaleDelta(), newPageScale);
     EXPECT_EQ(child->pageScaleDelta(), defaultPageScale);
@@ skipping 10 matching lines @@
     EXPECT_EQ(root->drawTransform().m22(), newPageScale);
     EXPECT_EQ(child->drawTransform().m11(), newPageScale);
     EXPECT_EQ(child->drawTransform().m22(), newPageScale);
     EXPECT_EQ(grandChild->drawTransform().m11(), newPageScale);
     EXPECT_EQ(grandChild->drawTransform().m22(), newPageScale);
 }
 
 TEST_F(CCLayerTreeHostImplTest, scrollChildAndChangePageScaleOnMainThread)
 {
     IntSize surfaceSize(10, 10);
-    OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
+    scoped_ptr<CCLayerImpl> root = CCLayerImpl::create(1);
     root->setBounds(surfaceSize);
     root->setContentBounds(surfaceSize);
     // Also mark the root scrollable so it becomes the root scroll layer.
     root->setScrollable(true);
     int scrollLayerId = 2;
     root->addChild(createScrollableLayer(scrollLayerId, surfaceSize));
-    m_hostImpl->setRootLayer(root.release());
+    m_hostImpl->setRootLayer(root.Pass());
     m_hostImpl->setViewportSize(surfaceSize, surfaceSize);
     initializeRendererAndDrawFrame();
 
     CCLayerImpl* child = m_hostImpl->rootLayer()->children()[0];
 
     IntSize scrollDelta(0, 10);
     IntSize expectedScrollDelta(scrollDelta);
     IntSize expectedMaxScroll(child->maxScrollPosition());
     EXPECT_EQ(m_hostImpl->scrollBegin(IntPoint(5, 5), CCInputHandlerClient::Wheel), CCInputHandlerClient::ScrollStarted);
     m_hostImpl->scrollBy(IntPoint(), scrollDelta);
@@ skipping 13 matching lines @@
     // The page scale delta remains constant because the impl thread did not scale.
     EXPECT_EQ(child->pageScaleDelta(), 1);
 }
 
 TEST_F(CCLayerTreeHostImplTest, scrollChildBeyondLimit)
 {
     // Scroll a child layer beyond its maximum scroll range and make sure the
     // parent layer is scrolled on the axis on which the child was unable to
     // scroll.
     IntSize surfaceSize(10, 10);
-    OwnPtr<CCLayerImpl> root = createScrollableLayer(1, surfaceSize);
+    scoped_ptr<CCLayerImpl> root = createScrollableLayer(1, surfaceSize);
 
-    OwnPtr<CCLayerImpl> grandChild = createScrollableLayer(3, surfaceSize);
+    scoped_ptr<CCLayerImpl> grandChild = createScrollableLayer(3, surfaceSize);
     grandChild->setScrollPosition(IntPoint(0, 5));
 
-    OwnPtr<CCLayerImpl> child = createScrollableLayer(2, surfaceSize);
+    scoped_ptr<CCLayerImpl> child = createScrollableLayer(2, surfaceSize);
     child->setScrollPosition(IntPoint(3, 0));
-    child->addChild(grandChild.release());
+    child->addChild(grandChild.Pass());
 
-    root->addChild(child.release());
-    m_hostImpl->setRootLayer(root.release());
+    root->addChild(child.Pass());
+    m_hostImpl->setRootLayer(root.Pass());
     m_hostImpl->setViewportSize(surfaceSize, surfaceSize);
     initializeRendererAndDrawFrame();
     {
         IntSize scrollDelta(-8, -7);
         EXPECT_EQ(m_hostImpl->scrollBegin(IntPoint(5, 5), CCInputHandlerClient::Wheel), CCInputHandlerClient::ScrollStarted);
         m_hostImpl->scrollBy(IntPoint(), scrollDelta);
         m_hostImpl->scrollEnd();
 
         OwnPtr<CCScrollAndScaleSet> scrollInfo = m_hostImpl->processScrollDeltas();
 
         // The grand child should have scrolled up to its limit.
         CCLayerImpl* child = m_hostImpl->rootLayer()->children()[0];
         CCLayerImpl* grandChild = child->children()[0];
         expectContains(*scrollInfo.get(), grandChild->id(), IntSize(0, -5));
 
         // The child should have only scrolled on the other axis.
         expectContains(*scrollInfo.get(), child->id(), IntSize(-3, 0));
     }
 }
 
 TEST_F(CCLayerTreeHostImplTest, scrollEventBubbling)
 {
     // When we try to scroll a non-scrollable child layer, the scroll delta
     // should be applied to one of its ancestors if possible.
     IntSize surfaceSize(10, 10);
-    OwnPtr<CCLayerImpl> root = createScrollableLayer(1, surfaceSize);
-    OwnPtr<CCLayerImpl> child = createScrollableLayer(2, surfaceSize);
+    scoped_ptr<CCLayerImpl> root = createScrollableLayer(1, surfaceSize);
+    scoped_ptr<CCLayerImpl> child = createScrollableLayer(2, surfaceSize);
 
     child->setScrollable(false);
-    root->addChild(child.release());
+    root->addChild(child.Pass());
 
-    m_hostImpl->setRootLayer(root.release());
+    m_hostImpl->setRootLayer(root.Pass());
     m_hostImpl->setViewportSize(surfaceSize, surfaceSize);
     initializeRendererAndDrawFrame();
     {
         IntSize scrollDelta(0, 4);
         EXPECT_EQ(m_hostImpl->scrollBegin(IntPoint(5, 5), CCInputHandlerClient::Wheel), CCInputHandlerClient::ScrollStarted);
         m_hostImpl->scrollBy(IntPoint(), scrollDelta);
         m_hostImpl->scrollEnd();
 
         OwnPtr<CCScrollAndScaleSet> scrollInfo = m_hostImpl->processScrollDeltas();
 
@@ skipping 53 matching lines @@
     expectContains(*scrollInfo.get(), m_hostImpl->rootLayer()->id(), wheelScrollDelta);
 }
 
 TEST_F(CCLayerTreeHostImplTest, scrollNonAxisAlignedRotatedLayer)
 {
     setupScrollAndContentsLayers(IntSize(100, 100));
     int childLayerId = 3;
     float childLayerAngle = -20;
 
     // Create a child layer that is rotated to a non-axis-aligned angle.
-    OwnPtr<CCLayerImpl> child = createScrollableLayer(childLayerId, m_hostImpl->rootLayer()->contentBounds());
+    scoped_ptr<CCLayerImpl> child = createScrollableLayer(childLayerId, m_hostImpl->rootLayer()->contentBounds());
     WebTransformationMatrix rotateTransform;
     rotateTransform.translate(-50, -50);
     rotateTransform.rotate(childLayerAngle);
     rotateTransform.translate(50, 50);
     child->setTransform(rotateTransform);
 
     // Only allow vertical scrolling.
     child->setMaxScrollPosition(IntSize(0, child->contentBounds().height()));
-    m_hostImpl->rootLayer()->addChild(child.release());
+    m_hostImpl->rootLayer()->addChild(child.Pass());
 
     IntSize surfaceSize(50, 50);
     m_hostImpl->setViewportSize(surfaceSize, surfaceSize);
     initializeRendererAndDrawFrame();
 
     {
         // Scroll down in screen coordinates with a gesture.
         IntSize gestureScrollDelta(0, 10);
         EXPECT_EQ(m_hostImpl->scrollBegin(IntPoint(0, 0), CCInputHandlerClient::Gesture), CCInputHandlerClient::ScrollStarted);
         m_hostImpl->scrollBy(IntPoint(), gestureScrollDelta);
@@ skipping 84 matching lines @@
     }
 
     bool blend() const { return m_blend; }
 
 private:
     bool m_blend;
 };
 
 class BlendStateCheckLayer : public CCLayerImpl {
 public:
-    static PassOwnPtr<BlendStateCheckLayer> create(int id, CCResourceProvider* resourceProvider) { return adoptPtr(new BlendStateCheckLayer(id, resourceProvider)); }
+    static scoped_ptr<CCLayerImpl> create(int id, CCResourceProvider* resourceProvider) { return scoped_ptr<CCLayerImpl>(new BlendStateCheckLayer(id, resourceProvider)); }
 
     virtual void appendQuads(CCQuadSink& quadSink, CCAppendQuadsData& appendQuadsData) OVERRIDE
     {
         m_quadsAppended = true;
 
         IntRect opaqueRect;
         if (contentsOpaque())
             opaqueRect = m_quadRect;
         else
             opaqueRect = m_opaqueContentRect;
@@ skipping 40 matching lines @@
     bool m_quadsAppended;
     IntRect m_quadRect;
     IntRect m_opaqueContentRect;
     IntRect m_quadVisibleRect;
     CCResourceProvider::ResourceId m_resourceId;
 };
 
 TEST_F(CCLayerTreeHostImplTest, blendingOffWhenDrawingOpaqueLayers)
 {
     {
-        OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
+        scoped_ptr<CCLayerImpl> root = CCLayerImpl::create(1);
         root->setAnchorPoint(FloatPoint(0, 0));
         root->setBounds(IntSize(10, 10));
         root->setContentBounds(root->bounds());
         root->setDrawsContent(false);
-        m_hostImpl->setRootLayer(root.release());
+        m_hostImpl->setRootLayer(root.Pass());
     }
     CCLayerImpl* root = m_hostImpl->rootLayer();
 
     root->addChild(BlendStateCheckLayer::create(2, m_hostImpl->resourceProvider()));
     BlendStateCheckLayer* layer1 = static_cast<BlendStateCheckLayer*>(root->children()[0]);
     layer1->setPosition(FloatPoint(2, 2));
 
     CCLayerTreeHostImpl::FrameData frame;
 
     // Opaque layer, drawn without blending.
@@ skipping 266 matching lines @@
     }
 
     bool reshapeCalled() const { return m_reshapeCalled; }
 
 private:
     bool m_reshapeCalled;
 };
 
 class FakeDrawableCCLayerImpl: public CCLayerImpl {
 public:
+    static scoped_ptr<CCLayerImpl> create(int id) { return scoped_ptr<CCLayerImpl>(new FakeDrawableCCLayerImpl(id)); }
+protected:
     explicit FakeDrawableCCLayerImpl(int id) : CCLayerImpl(id) { }
 };
 
 // Only reshape when we know we are going to draw. Otherwise, the reshape
 // can leave the window at the wrong size if we never draw and the proper
 // viewport size is never set.
 TEST_F(CCLayerTreeHostImplTest, reshapeNotCalledUntilDraw)
 {
     scoped_ptr<CCGraphicsContext> ccContext = FakeWebCompositorOutputSurface::create(adoptPtr(new ReshapeTrackerContext)).PassAs<CCGraphicsContext>();
     ReshapeTrackerContext* reshapeTracker = static_cast<ReshapeTrackerContext*>(ccContext->context3D());
     m_hostImpl->initializeRenderer(ccContext.Pass());
 
-    CCLayerImpl* root = new FakeDrawableCCLayerImpl(1);
+    scoped_ptr<CCLayerImpl> root = FakeDrawableCCLayerImpl::create(1);
     root->setAnchorPoint(FloatPoint(0, 0));
     root->setBounds(IntSize(10, 10));
     root->setDrawsContent(true);
-    m_hostImpl->setRootLayer(adoptPtr(root));
+    m_hostImpl->setRootLayer(root.Pass());
     EXPECT_FALSE(reshapeTracker->reshapeCalled());
 
     CCLayerTreeHostImpl::FrameData frame;
     EXPECT_TRUE(m_hostImpl->prepareToDraw(frame));
     m_hostImpl->drawLayers(frame);
     EXPECT_TRUE(reshapeTracker->reshapeCalled());
     m_hostImpl->didDrawAllLayers(frame);
 }
 
 class PartialSwapTrackerContext : public FakeWebGraphicsContext3D {
@@ skipping 25 matching lines @@
     PartialSwapTrackerContext* partialSwapTracker = static_cast<PartialSwapTrackerContext*>(ccContext->context3D());
 
     // This test creates its own CCLayerTreeHostImpl, so
     // that we can force partial swap enabled.
     CCLayerTreeSettings settings;
     CCSettings::setPartialSwapEnabled(true);
     scoped_ptr<CCLayerTreeHostImpl> layerTreeHostImpl = CCLayerTreeHostImpl::create(settings, this);
     layerTreeHostImpl->initializeRenderer(ccContext.Pass());
     layerTreeHostImpl->setViewportSize(IntSize(500, 500), IntSize(500, 500));
 
-    CCLayerImpl* root = new FakeDrawableCCLayerImpl(1);
-    CCLayerImpl* child = new FakeDrawableCCLayerImpl(2);
+    scoped_ptr<CCLayerImpl> root = FakeDrawableCCLayerImpl::create(1);
+    scoped_ptr<CCLayerImpl> child = FakeDrawableCCLayerImpl::create(2);
     child->setPosition(FloatPoint(12, 13));
     child->setAnchorPoint(FloatPoint(0, 0));
     child->setBounds(IntSize(14, 15));
     child->setContentBounds(IntSize(14, 15));
     child->setDrawsContent(true);
     root->setAnchorPoint(FloatPoint(0, 0));
     root->setBounds(IntSize(500, 500));
     root->setContentBounds(IntSize(500, 500));
     root->setDrawsContent(true);
-    root->addChild(adoptPtr(child));
-    layerTreeHostImpl->setRootLayer(adoptPtr(root));
+    root->addChild(child.Pass());
+    layerTreeHostImpl->setRootLayer(root.Pass());
 
     CCLayerTreeHostImpl::FrameData frame;
 
     // First frame, the entire screen should get swapped.
     EXPECT_TRUE(layerTreeHostImpl->prepareToDraw(frame));
     layerTreeHostImpl->drawLayers(frame);
     layerTreeHostImpl->didDrawAllLayers(frame);
     layerTreeHostImpl->swapBuffers();
     IntRect actualSwapRect = partialSwapTracker->partialSwapRect();
     IntRect expectedSwapRect = IntRect(IntPoint::zero(), IntSize(500, 500));
@@ skipping 30 matching lines @@
     actualSwapRect = partialSwapTracker->partialSwapRect();
     expectedSwapRect = IntRect(IntPoint::zero(), IntSize(10, 10));
     EXPECT_EQ(expectedSwapRect.x(), actualSwapRect.x());
     EXPECT_EQ(expectedSwapRect.y(), actualSwapRect.y());
     EXPECT_EQ(expectedSwapRect.width(), actualSwapRect.width());
     EXPECT_EQ(expectedSwapRect.height(), actualSwapRect.height());
 }
 
 TEST_F(CCLayerTreeHostImplTest, rootLayerDoesntCreateExtraSurface)
 {
-    CCLayerImpl* root = new FakeDrawableCCLayerImpl(1);
-    CCLayerImpl* child = new FakeDrawableCCLayerImpl(2);
+    scoped_ptr<CCLayerImpl> root = FakeDrawableCCLayerImpl::create(1);
+    scoped_ptr<CCLayerImpl> child = FakeDrawableCCLayerImpl::create(2);
     child->setAnchorPoint(FloatPoint(0, 0));
     child->setBounds(IntSize(10, 10));
     child->setContentBounds(IntSize(10, 10));
     child->setDrawsContent(true);
     root->setAnchorPoint(FloatPoint(0, 0));
     root->setBounds(IntSize(10, 10));
     root->setContentBounds(IntSize(10, 10));
     root->setDrawsContent(true);
     root->setOpacity(0.7f);
-    root->addChild(adoptPtr(child));
+    root->addChild(child.Pass());
 
-    m_hostImpl->setRootLayer(adoptPtr(root));
+    m_hostImpl->setRootLayer(root.Pass());
 
     CCLayerTreeHostImpl::FrameData frame;
 
     EXPECT_TRUE(m_hostImpl->prepareToDraw(frame));
     EXPECT_EQ(1u, frame.renderSurfaceLayerList->size());
     EXPECT_EQ(1u, frame.renderPasses.size());
     m_hostImpl->didDrawAllLayers(frame);
 }
 
 } // namespace
 
 class FakeLayerWithQuads : public CCLayerImpl {
 public:
-    static PassOwnPtr<FakeLayerWithQuads> create(int id) { return adoptPtr(new FakeLayerWithQuads(id)); }
+    static scoped_ptr<CCLayerImpl> create(int id) { return scoped_ptr<CCLayerImpl>(new FakeLayerWithQuads(id)); }
 
     virtual void appendQuads(CCQuadSink& quadSink, CCAppendQuadsData& appendQuadsData) OVERRIDE
     {
         CCSharedQuadState* sharedQuadState = quadSink.useSharedQuadState(createSharedQuadState());
 
         SkColor gray = SkColorSetRGB(100, 100, 100);
         IntRect quadRect(IntPoint(0, 0), contentBounds());
         scoped_ptr<CCSolidColorDrawQuad> myQuad = CCSolidColorDrawQuad::create(sharedQuadState, quadRect, gray);
         quadSink.append(myQuad.PassAs<CCDrawQuad>(), appendQuadsData);
     }
@@ skipping 194 matching lines @@
          |  | |   3               |
          |  | +-------------------+
          |  |           |     |
          |  +-----------+     |
          |                    |
          |                    |
          +--------------------+
 
          Layers 1, 2 have render surfaces
      */
-    OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
-    OwnPtr<CCLayerImpl> child = CCLayerImpl::create(2);
-    OwnPtr<CCLayerImpl> grandChild = FakeLayerWithQuads::create(3);
+    scoped_ptr<CCLayerImpl> root = CCLayerImpl::create(1);
+    scoped_ptr<CCLayerImpl> child = CCLayerImpl::create(2);
+    scoped_ptr<CCLayerImpl> grandChild = FakeLayerWithQuads::create(3);
 
     IntRect rootRect(0, 0, 100, 100);
     IntRect childRect(10, 10, 50, 50);
     IntRect grandChildRect(5, 5, 150, 150);
 
     root->createRenderSurface();
     root->setAnchorPoint(FloatPoint(0, 0));
     root->setPosition(FloatPoint(rootRect.x(), rootRect.y()));
     root->setBounds(IntSize(rootRect.width(), rootRect.height()));
     root->setContentBounds(root->bounds());
     root->setVisibleContentRect(rootRect);
     root->setDrawsContent(false);
     root->renderSurface()->setContentRect(IntRect(IntPoint(), IntSize(rootRect.width(), rootRect.height())));
 
     child->setAnchorPoint(FloatPoint(0, 0));
     child->setPosition(FloatPoint(childRect.x(), childRect.y()));
     child->setOpacity(0.5f);
     child->setBounds(IntSize(childRect.width(), childRect.height()));
     child->setContentBounds(child->bounds());
     child->setVisibleContentRect(childRect);
     child->setDrawsContent(false);
 
     grandChild->setAnchorPoint(FloatPoint(0, 0));
     grandChild->setPosition(IntPoint(grandChildRect.x(), grandChildRect.y()));
     grandChild->setBounds(IntSize(grandChildRect.width(), grandChildRect.height()));
     grandChild->setContentBounds(grandChild->bounds());
     grandChild->setVisibleContentRect(grandChildRect);
     grandChild->setDrawsContent(true);
 
-    child->addChild(grandChild.release());
-    root->addChild(child.release());
+    child->addChild(grandChild.Pass());
+    root->addChild(child.Pass());
 
-    myHostImpl->setRootLayer(root.release());
+    myHostImpl->setRootLayer(root.Pass());
     return myHostImpl.Pass();
 }
 
 TEST_F(CCLayerTreeHostImplTest, contributingLayerEmptyScissorPartialSwap)
 {
     scoped_ptr<CCLayerTreeHostImpl> myHostImpl = setupLayersForOpacity(true, this);
 
     {
         CCLayerTreeHostImpl::FrameData frame;
         EXPECT_TRUE(myHostImpl->prepareToDraw(frame));
@@ skipping 28 matching lines @@
         ASSERT_EQ(1U, frame.renderPasses[0]->quadList().size());
         ASSERT_EQ(1U, frame.renderPasses[1]->quadList().size());
         EXPECT_EQ(CCDrawQuad::SolidColor, frame.renderPasses[0]->quadList()[0]->material());
         EXPECT_EQ(CCDrawQuad::RenderPass, frame.renderPasses[1]->quadList()[0]->material());
     }
 }
 
 // Make sure that context lost notifications are propagated through the tree.
 class ContextLostNotificationCheckLayer : public CCLayerImpl {
 public:
-    static PassOwnPtr<ContextLostNotificationCheckLayer> create(int id) { return adoptPtr(new ContextLostNotificationCheckLayer(id)); }
+    static scoped_ptr<CCLayerImpl> create(int id) { return scoped_ptr<CCLayerImpl>(new ContextLostNotificationCheckLayer(id)); }
 
     virtual void didLoseContext() OVERRIDE
     {
         m_didLoseContextCalled = true;
     }
 
     bool didLoseContextCalled() const { return m_didLoseContextCalled; }
 
 private:
     explicit ContextLostNotificationCheckLayer(int id)
@@ skipping 254 matching lines @@
     virtual void splitTrack(WebScrollbar*, const WebRect& track, WebRect& startTrack, WebRect& thumb, WebRect& endTrack) OVERRIDE
     {
         thumb = WebRect(0, 5, 5, 2);
         startTrack = WebRect(0, 5, 0, 5);
         endTrack = WebRect(0, 0, 0, 5);
     }
 };
 
 class FakeScrollbarLayerImpl : public CCScrollbarLayerImpl {
 public:
-    static PassOwnPtr<FakeScrollbarLayerImpl> create(int id)
+    static scoped_ptr<FakeScrollbarLayerImpl> create(int id)
     {
-        return adoptPtr(new FakeScrollbarLayerImpl(id));
+        return make_scoped_ptr(new FakeScrollbarLayerImpl(id));
     }
 
     void createResources(CCResourceProvider* provider)
     {
         ASSERT(provider);
         int pool = 0;
         IntSize size(10, 10);
         GC3Denum format = GraphicsContext3D::RGBA;
         CCResourceProvider::TextureUsageHint hint = CCResourceProvider::TextureUsageAny;
         setScrollbarGeometry(CCScrollbarGeometryFixedThumb::create(FakeWebScrollbarThemeGeometryNonEmpty::create()));
@@ skipping 21 matching lines @@
     static_cast<CCTestRenderPass*>(pass.get())->appendSharedQuadState(sharedState.Pass());
     static_cast<CCTestRenderPass*>(pass.get())->appendQuad(quad.PassAs<CCDrawQuad>());
 
     return pass.Pass();
 }
 
 TEST_F(CCLayerTreeHostImplTest, dontUseOldResourcesAfterLostContext)
 {
     int layerId = 1;
 
-    OwnPtr<CCLayerImpl> rootLayer(CCLayerImpl::create(layerId++));
+    scoped_ptr<CCLayerImpl> rootLayer(CCLayerImpl::create(layerId++));
     rootLayer->setBounds(IntSize(10, 10));
     rootLayer->setAnchorPoint(FloatPoint(0, 0));
 
-    OwnPtr<CCTiledLayerImpl> tileLayer = CCTiledLayerImpl::create(layerId++);
+    scoped_ptr<CCTiledLayerImpl> tileLayer = CCTiledLayerImpl::create(layerId++);
     tileLayer->setBounds(IntSize(10, 10));
     tileLayer->setAnchorPoint(FloatPoint(0, 0));
     tileLayer->setContentBounds(IntSize(10, 10));
     tileLayer->setDrawsContent(true);
     tileLayer->setSkipsDraw(false);
     OwnPtr<CCLayerTilingData> tilingData(CCLayerTilingData::create(IntSize(10, 10), CCLayerTilingData::NoBorderTexels));
     tilingData->setBounds(IntSize(10, 10));
     tileLayer->setTilingData(*tilingData);
     tileLayer->pushTileProperties(0, 0, 1, IntRect(0, 0, 10, 10));
-    rootLayer->addChild(tileLayer.release());
+    rootLayer->addChild(tileLayer.PassAs<CCLayerImpl>());
 
-    OwnPtr<CCTextureLayerImpl> textureLayer = CCTextureLayerImpl::create(layerId++);
+    scoped_ptr<CCTextureLayerImpl> textureLayer = CCTextureLayerImpl::create(layerId++);
     textureLayer->setBounds(IntSize(10, 10));
     textureLayer->setAnchorPoint(FloatPoint(0, 0));
     textureLayer->setContentBounds(IntSize(10, 10));
     textureLayer->setDrawsContent(true);
     textureLayer->setTextureId(1);
-    rootLayer->addChild(textureLayer.release());
+    rootLayer->addChild(textureLayer.PassAs<CCLayerImpl>());
 
-    OwnPtr<CCTiledLayerImpl> maskLayer = CCTiledLayerImpl::create(layerId++);
+    scoped_ptr<CCTiledLayerImpl> maskLayer = CCTiledLayerImpl::create(layerId++);
     maskLayer->setBounds(IntSize(10, 10));
     maskLayer->setAnchorPoint(FloatPoint(0, 0));
     maskLayer->setContentBounds(IntSize(10, 10));
     maskLayer->setDrawsContent(true);
     maskLayer->setSkipsDraw(false);
     maskLayer->setTilingData(*tilingData);
     maskLayer->pushTileProperties(0, 0, 1, IntRect(0, 0, 10, 10));
 
-    OwnPtr<CCTextureLayerImpl> textureLayerWithMask = CCTextureLayerImpl::create(layerId++);
+    scoped_ptr<CCTextureLayerImpl> textureLayerWithMask = CCTextureLayerImpl::create(layerId++);
     textureLayerWithMask->setBounds(IntSize(10, 10));
     textureLayerWithMask->setAnchorPoint(FloatPoint(0, 0));
     textureLayerWithMask->setContentBounds(IntSize(10, 10));
     textureLayerWithMask->setDrawsContent(true);
     textureLayerWithMask->setTextureId(1);
-    textureLayerWithMask->setMaskLayer(maskLayer.release());
-    rootLayer->addChild(textureLayerWithMask.release());
+    textureLayerWithMask->setMaskLayer(maskLayer.PassAs<CCLayerImpl>());
+    rootLayer->addChild(textureLayerWithMask.PassAs<CCLayerImpl>());
 
     FakeVideoFrame videoFrame;
     FakeVideoFrameProvider provider;
     provider.setFrame(&videoFrame);
-    OwnPtr<CCVideoLayerImpl> videoLayer = CCVideoLayerImpl::create(layerId++, &provider);
+    scoped_ptr<CCVideoLayerImpl> videoLayer = CCVideoLayerImpl::create(layerId++, &provider);
     videoLayer->setBounds(IntSize(10, 10));
     videoLayer->setAnchorPoint(FloatPoint(0, 0));
     videoLayer->setContentBounds(IntSize(10, 10));
     videoLayer->setDrawsContent(true);
     videoLayer->setLayerTreeHostImpl(m_hostImpl.get());
-    rootLayer->addChild(videoLayer.release());
+    rootLayer->addChild(videoLayer.PassAs<CCLayerImpl>());
 
     FakeVideoFrame hwVideoFrame;
     FakeVideoFrameProvider hwProvider;
     hwProvider.setFrame(&hwVideoFrame);
-    OwnPtr<CCVideoLayerImpl> hwVideoLayer = CCVideoLayerImpl::create(layerId++, &hwProvider);
+    scoped_ptr<CCVideoLayerImpl> hwVideoLayer = CCVideoLayerImpl::create(layerId++, &hwProvider);
     hwVideoLayer->setBounds(IntSize(10, 10));
     hwVideoLayer->setAnchorPoint(FloatPoint(0, 0));
     hwVideoLayer->setContentBounds(IntSize(10, 10));
     hwVideoLayer->setDrawsContent(true);
     hwVideoLayer->setLayerTreeHostImpl(m_hostImpl.get());
-    rootLayer->addChild(hwVideoLayer.release());
+    rootLayer->addChild(hwVideoLayer.PassAs<CCLayerImpl>());
 
-    OwnPtr<CCIOSurfaceLayerImpl> ioSurfaceLayer = CCIOSurfaceLayerImpl::create(layerId++);
+    scoped_ptr<CCIOSurfaceLayerImpl> ioSurfaceLayer = CCIOSurfaceLayerImpl::create(layerId++);
     ioSurfaceLayer->setBounds(IntSize(10, 10));
     ioSurfaceLayer->setAnchorPoint(FloatPoint(0, 0));
     ioSurfaceLayer->setContentBounds(IntSize(10, 10));
     ioSurfaceLayer->setDrawsContent(true);
     ioSurfaceLayer->setIOSurfaceProperties(1, IntSize(10, 10));
     ioSurfaceLayer->setLayerTreeHostImpl(m_hostImpl.get());
-    rootLayer->addChild(ioSurfaceLayer.release());
+    rootLayer->addChild(ioSurfaceLayer.PassAs<CCLayerImpl>());
 
-    OwnPtr<CCHeadsUpDisplayLayerImpl> hudLayer = CCHeadsUpDisplayLayerImpl::create(layerId++);
+    scoped_ptr<CCHeadsUpDisplayLayerImpl> hudLayer = CCHeadsUpDisplayLayerImpl::create(layerId++);
     hudLayer->setBounds(IntSize(10, 10));
     hudLayer->setAnchorPoint(FloatPoint(0, 0));
     hudLayer->setContentBounds(IntSize(10, 10));
     hudLayer->setDrawsContent(true);
     hudLayer->setLayerTreeHostImpl(m_hostImpl.get());
-    rootLayer->addChild(hudLayer.release());
+    rootLayer->addChild(hudLayer.PassAs<CCLayerImpl>());
 
-    OwnPtr<FakeScrollbarLayerImpl> scrollbarLayer(FakeScrollbarLayerImpl::create(layerId++));
+    scoped_ptr<FakeScrollbarLayerImpl> scrollbarLayer(FakeScrollbarLayerImpl::create(layerId++));
     scrollbarLayer->setBounds(IntSize(10, 10));
     scrollbarLayer->setContentBounds(IntSize(10, 10));
     scrollbarLayer->setDrawsContent(true);
     scrollbarLayer->setLayerTreeHostImpl(m_hostImpl.get());
     scrollbarLayer->createResources(m_hostImpl->resourceProvider());
-    rootLayer->addChild(scrollbarLayer.release());
+    rootLayer->addChild(scrollbarLayer.PassAs<CCLayerImpl>());
 
-    OwnPtr<CCDelegatedRendererLayerImpl> delegatedRendererLayer(CCDelegatedRendererLayerImpl::create(layerId++));
+    scoped_ptr<CCDelegatedRendererLayerImpl> delegatedRendererLayer(CCDelegatedRendererLayerImpl::create(layerId++));
     delegatedRendererLayer->setBounds(IntSize(10, 10));
     delegatedRendererLayer->setContentBounds(IntSize(10, 10));
     delegatedRendererLayer->setDrawsContent(true);
     delegatedRendererLayer->setLayerTreeHostImpl(m_hostImpl.get());
     ScopedPtrVector<CCRenderPass> passList;
     passList.append(createRenderPassWithResource(m_hostImpl->resourceProvider()));
     delegatedRendererLayer->setRenderPasses(passList);
     EXPECT_TRUE(passList.isEmpty());
-    rootLayer->addChild(delegatedRendererLayer.release());
+    rootLayer->addChild(delegatedRendererLayer.PassAs<CCLayerImpl>());
 
     // Use a context that supports IOSurfaces
     m_hostImpl->initializeRenderer(FakeWebCompositorOutputSurface::create(adoptPtr(new FakeWebGraphicsContext3DWithIOSurface)).PassAs<CCGraphicsContext>());
 
     hwVideoFrame.setTextureId(m_hostImpl->resourceProvider()->graphicsContext3D()->createTexture());
 
-    m_hostImpl->setRootLayer(rootLayer.release());
+    m_hostImpl->setRootLayer(rootLayer.Pass());
 
     CCLayerTreeHostImpl::FrameData frame;
     EXPECT_TRUE(m_hostImpl->prepareToDraw(frame));
     m_hostImpl->drawLayers(frame);
     m_hostImpl->didDrawAllLayers(frame);
     m_hostImpl->swapBuffers();
 
     unsigned numResources = m_hostImpl->resourceProvider()->numResources();
 
     // Lose the context, replacing it with a StrictWebGraphicsContext3DWithIOSurface,
@@ skipping 59 matching lines @@
 
     unsigned numTextures() const { return m_numTextures; }
 
 private:
     HashMap<WebGLId, bool> m_textures;
     unsigned m_numTextures;
 };
 
 TEST_F(CCLayerTreeHostImplTest, layersFreeTextures)
 {
-    OwnPtr<CCLayerImpl> rootLayer(CCLayerImpl::create(1));
+    scoped_ptr<CCLayerImpl> rootLayer(CCLayerImpl::create(1));
     rootLayer->setBounds(IntSize(10, 10));
     rootLayer->setAnchorPoint(FloatPoint(0, 0));
 
-    OwnPtr<CCTiledLayerImpl> tileLayer = CCTiledLayerImpl::create(2);
+    scoped_ptr<CCTiledLayerImpl> tileLayer = CCTiledLayerImpl::create(2);
     tileLayer->setBounds(IntSize(10, 10));
     tileLayer->setAnchorPoint(FloatPoint(0, 0));
     tileLayer->setContentBounds(IntSize(10, 10));
     tileLayer->setDrawsContent(true);
     tileLayer->setSkipsDraw(false);
     OwnPtr<CCLayerTilingData> tilingData(CCLayerTilingData::create(IntSize(10, 10), CCLayerTilingData::NoBorderTexels));
     tilingData->setBounds(IntSize(10, 10));
     tileLayer->setTilingData(*tilingData);
     tileLayer->pushTileProperties(0, 0, 1, IntRect(0, 0, 10, 10));
-    rootLayer->addChild(tileLayer.release());
+    rootLayer->addChild(tileLayer.PassAs<CCLayerImpl>());
 
-    OwnPtr<CCTextureLayerImpl> textureLayer = CCTextureLayerImpl::create(3);
+    scoped_ptr<CCTextureLayerImpl> textureLayer = CCTextureLayerImpl::create(3);
     textureLayer->setBounds(IntSize(10, 10));
     textureLayer->setAnchorPoint(FloatPoint(0, 0));
     textureLayer->setContentBounds(IntSize(10, 10));
     textureLayer->setDrawsContent(true);
     textureLayer->setTextureId(1);
-    rootLayer->addChild(textureLayer.release());
+    rootLayer->addChild(textureLayer.PassAs<CCLayerImpl>());
 
     FakeVideoFrameProvider provider;
-    OwnPtr<CCVideoLayerImpl> videoLayer = CCVideoLayerImpl::create(4, &provider);
+    scoped_ptr<CCVideoLayerImpl> videoLayer = CCVideoLayerImpl::create(4, &provider);
     videoLayer->setBounds(IntSize(10, 10));
     videoLayer->setAnchorPoint(FloatPoint(0, 0));
     videoLayer->setContentBounds(IntSize(10, 10));
     videoLayer->setDrawsContent(true);
     videoLayer->setLayerTreeHostImpl(m_hostImpl.get());
-    rootLayer->addChild(videoLayer.release());
+    rootLayer->addChild(videoLayer.PassAs<CCLayerImpl>());
 
-    OwnPtr<CCIOSurfaceLayerImpl> ioSurfaceLayer = CCIOSurfaceLayerImpl::create(5);
+    scoped_ptr<CCIOSurfaceLayerImpl> ioSurfaceLayer = CCIOSurfaceLayerImpl::create(5);
     ioSurfaceLayer->setBounds(IntSize(10, 10));
     ioSurfaceLayer->setAnchorPoint(FloatPoint(0, 0));
     ioSurfaceLayer->setContentBounds(IntSize(10, 10));
     ioSurfaceLayer->setDrawsContent(true);
     ioSurfaceLayer->setIOSurfaceProperties(1, IntSize(10, 10));
     ioSurfaceLayer->setLayerTreeHostImpl(m_hostImpl.get());
-    rootLayer->addChild(ioSurfaceLayer.release());
+    rootLayer->addChild(ioSurfaceLayer.PassAs<CCLayerImpl>());
 
     // Lose the context, replacing it with a TrackingWebGraphicsContext3D (which the CCLayerTreeHostImpl takes ownership of).
     scoped_ptr<CCGraphicsContext> ccContext(FakeWebCompositorOutputSurface::create(adoptPtr(new TrackingWebGraphicsContext3D)));
     TrackingWebGraphicsContext3D* trackingWebGraphicsContext = static_cast<TrackingWebGraphicsContext3D*>(ccContext->context3D());
     m_hostImpl->initializeRenderer(ccContext.Pass());
 
-    m_hostImpl->setRootLayer(rootLayer.release());
+    m_hostImpl->setRootLayer(rootLayer.Pass());
 
     CCLayerTreeHostImpl::FrameData frame;
     EXPECT_TRUE(m_hostImpl->prepareToDraw(frame));
     m_hostImpl->drawLayers(frame);
     m_hostImpl->didDrawAllLayers(frame);
     m_hostImpl->swapBuffers();
 
     EXPECT_GT(trackingWebGraphicsContext->numTextures(), 0u);
 
     // Kill the layer tree.
@@ skipping 32 matching lines @@
     // Verify no quads are drawn when transparent background is set.
     myHostImpl->setHasTransparentBackground(true);
     EXPECT_TRUE(myHostImpl->prepareToDraw(frame));
     myHostImpl->drawLayers(frame);
     myHostImpl->didDrawAllLayers(frame);
     Mock::VerifyAndClearExpectations(&mockContext);
 }
 
 static void addDrawingLayerTo(CCLayerImpl* parent, int id, const IntRect& layerRect, CCLayerImpl** result)
 {
-    OwnPtr<CCLayerImpl> layer = FakeLayerWithQuads::create(id);
+    scoped_ptr<CCLayerImpl> layer = FakeLayerWithQuads::create(id);
     CCLayerImpl* layerPtr = layer.get();
     layerPtr->setAnchorPoint(FloatPoint(0, 0));
     layerPtr->setPosition(FloatPoint(layerRect.location()));
     layerPtr->setBounds(layerRect.size());
     layerPtr->setContentBounds(layerRect.size());
     layerPtr->setDrawsContent(true); // only children draw content
     layerPtr->setContentsOpaque(true);
-    parent->addChild(layer.release());
+    parent->addChild(layer.Pass());
     if (result)
         *result = layerPtr;
 }
 
 static void setupLayersForTextureCaching(CCLayerTreeHostImpl* layerTreeHostImpl, CCLayerImpl*& rootPtr, CCLayerImpl*& intermediateLayerPtr, CCLayerImpl*& surfaceLayerPtr, CCLayerImpl*& childPtr, const IntSize& rootSize)
 {
     scoped_ptr<CCGraphicsContext> context = FakeWebCompositorOutputSurface::create(adoptPtr(new PartialSwapContext)).PassAs<CCGraphicsContext>();
 
     layerTreeHostImpl->initializeRenderer(context.Pass());
     layerTreeHostImpl->setViewportSize(rootSize, rootSize);
 
-    OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
+    scoped_ptr<CCLayerImpl> root = CCLayerImpl::create(1);
     rootPtr = root.get();
 
     root->setAnchorPoint(FloatPoint(0, 0));
     root->setPosition(FloatPoint(0, 0));
     root->setBounds(rootSize);
     root->setContentBounds(rootSize);
     root->setDrawsContent(true);
-    layerTreeHostImpl->setRootLayer(root.release());
+    layerTreeHostImpl->setRootLayer(root.Pass());
 
     addDrawingLayerTo(rootPtr, 2, IntRect(10, 10, rootSize.width(), rootSize.height()), &intermediateLayerPtr);
     intermediateLayerPtr->setDrawsContent(false); // only children draw content
 
     // Surface layer is the layer that changes its opacity
     // It will contain other layers that draw content.
     addDrawingLayerTo(intermediateLayerPtr, 3, IntRect(10, 10, rootSize.width(), rootSize.height()), &surfaceLayerPtr);
     surfaceLayerPtr->setDrawsContent(false); // only children draw content
     surfaceLayerPtr->setOpacity(0.5f); // This will cause it to have a surface
 
@@ skipping 17 matching lines @@
     CCLayerImpl* rootPtr;
     CCLayerImpl* surfaceLayerPtr;
 
     scoped_ptr<CCGraphicsContext> context = FakeWebCompositorOutputSurface::create(adoptPtr(new PartialSwapContext)).PassAs<CCGraphicsContext>();
 
     IntSize rootSize(100, 100);
 
     myHostImpl->initializeRenderer(context.Pass());
     myHostImpl->setViewportSize(IntSize(rootSize.width(), rootSize.height()), IntSize(rootSize.width(), rootSize.height()));
 
-    OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
+    scoped_ptr<CCLayerImpl> root = CCLayerImpl::create(1);
     rootPtr = root.get();
 
     root->setAnchorPoint(FloatPoint(0, 0));
     root->setPosition(FloatPoint(0, 0));
     root->setBounds(rootSize);
     root->setContentBounds(rootSize);
     root->setDrawsContent(true);
     root->setMasksToBounds(true);
-    myHostImpl->setRootLayer(root.release());
+    myHostImpl->setRootLayer(root.Pass());
 
     addDrawingLayerTo(rootPtr, 3, IntRect(0, 0, rootSize.width(), rootSize.height()), &surfaceLayerPtr);
     surfaceLayerPtr->setDrawsContent(false);
 
     // Surface layer is the layer that changes its opacity
     // It will contain other layers that draw content.
     surfaceLayerPtr->setOpacity(0.5f); // This will cause it to have a surface
 
     addDrawingLayerTo(surfaceLayerPtr, 4, IntRect(0, 0, 100, 3), 0);
     addDrawingLayerTo(surfaceLayerPtr, 5, IntRect(0, 97, 100, 3), 0);
@@ skipping 82 matching lines @@
     CCLayerImpl* layerS1Ptr;
     CCLayerImpl* layerS2Ptr;
 
     scoped_ptr<CCGraphicsContext> context = FakeWebCompositorOutputSurface::create(adoptPtr(new PartialSwapContext)).PassAs<CCGraphicsContext>();
 
     IntSize rootSize(1000, 1000);
 
     myHostImpl->initializeRenderer(context.Pass());
     myHostImpl->setViewportSize(IntSize(rootSize.width(), rootSize.height()), IntSize(rootSize.width(), rootSize.height()));
 
-    OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
+    scoped_ptr<CCLayerImpl> root = CCLayerImpl::create(1);
     rootPtr = root.get();
 
     root->setAnchorPoint(FloatPoint(0, 0));
     root->setPosition(FloatPoint(0, 0));
     root->setBounds(rootSize);
     root->setContentBounds(rootSize);
     root->setDrawsContent(true);
     root->setMasksToBounds(true);
-    myHostImpl->setRootLayer(root.release());
+    myHostImpl->setRootLayer(root.Pass());
 
     addDrawingLayerTo(rootPtr, 2, IntRect(300, 300, 300, 300), &layerS1Ptr);
     layerS1Ptr->setForceRenderSurface(true);
 
     addDrawingLayerTo(layerS1Ptr, 3, IntRect(10, 10, 10, 10), 0); // L11
     addDrawingLayerTo(layerS1Ptr, 4, IntRect(0, 0, 30, 30), 0); // L12
 
     addDrawingLayerTo(rootPtr, 5, IntRect(550, 250, 300, 400), &layerS2Ptr);
     layerS2Ptr->setForceRenderSurface(true);
 
@@ skipping 83 matching lines @@
     CCLayerImpl* layerS1Ptr;
     CCLayerImpl* layerS2Ptr;
 
     scoped_ptr<CCGraphicsContext> context = FakeWebCompositorOutputSurface::create(adoptPtr(new PartialSwapContext)).PassAs<CCGraphicsContext>();
 
     IntSize rootSize(1000, 1000);
 
     myHostImpl->initializeRenderer(context.Pass());
     myHostImpl->setViewportSize(IntSize(rootSize.width(), rootSize.height()), IntSize(rootSize.width(), rootSize.height()));
 
-    OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
+    scoped_ptr<CCLayerImpl> root = CCLayerImpl::create(1);
     rootPtr = root.get();
 
     root->setAnchorPoint(FloatPoint(0, 0));
     root->setPosition(FloatPoint(0, 0));
     root->setBounds(rootSize);
     root->setContentBounds(rootSize);
     root->setDrawsContent(true);
     root->setMasksToBounds(true);
-    myHostImpl->setRootLayer(root.release());
+    myHostImpl->setRootLayer(root.Pass());
 
     addDrawingLayerTo(rootPtr, 2, IntRect(0, 0, 800, 800), &layerS1Ptr);
     layerS1Ptr->setForceRenderSurface(true);
     layerS1Ptr->setDrawsContent(false);
 
     addDrawingLayerTo(layerS1Ptr, 3, IntRect(0, 0, 300, 300), 0); // L11
     addDrawingLayerTo(layerS1Ptr, 4, IntRect(0, 500, 300, 300), 0); // L12
     addDrawingLayerTo(layerS1Ptr, 5, IntRect(500, 0, 300, 300), 0); // L13
     addDrawingLayerTo(layerS1Ptr, 6, IntRect(500, 500, 300, 300), 0); // L14
     addDrawingLayerTo(layerS1Ptr, 9, IntRect(500, 500, 300, 300), 0); // L14
@@ skipping 84 matching lines @@
     CCLayerImpl* layerS1Ptr;
     CCLayerImpl* layerS2Ptr;
 
     scoped_ptr<CCGraphicsContext> context = FakeWebCompositorOutputSurface::create(adoptPtr(new PartialSwapContext)).PassAs<CCGraphicsContext>();
 
     IntSize rootSize(1000, 1000);
 
     myHostImpl->initializeRenderer(context.Pass());
     myHostImpl->setViewportSize(IntSize(rootSize.width(), rootSize.height()), IntSize(rootSize.width(), rootSize.height()));
 
-    OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
+    scoped_ptr<CCLayerImpl> root = CCLayerImpl::create(1);
     rootPtr = root.get();
 
     root->setAnchorPoint(FloatPoint(0, 0));
     root->setPosition(FloatPoint(0, 0));
     root->setBounds(rootSize);
     root->setContentBounds(rootSize);
     root->setDrawsContent(true);
     root->setMasksToBounds(true);
-    myHostImpl->setRootLayer(root.release());
+    myHostImpl->setRootLayer(root.Pass());
 
     addDrawingLayerTo(rootPtr, 2, IntRect(0, 0, 400, 400), &layerS1Ptr);
     layerS1Ptr->setForceRenderSurface(true);
 
     addDrawingLayerTo(layerS1Ptr, 3, IntRect(0, 0, 300, 300), 0); // L11
     addDrawingLayerTo(layerS1Ptr, 4, IntRect(100, 0, 300, 300), 0); // L12
 
     addDrawingLayerTo(rootPtr, 7, IntRect(200, 0, 300, 300), &layerS2Ptr);
     layerS2Ptr->setForceRenderSurface(true);
 
@@ skipping 53 matching lines @@
     CCLayerImpl* rootPtr;
     CCLayerImpl* layerS1Ptr;
 
     scoped_ptr<CCGraphicsContext> context = FakeWebCompositorOutputSurface::create(adoptPtr(new PartialSwapContext)).PassAs<CCGraphicsContext>();
 
     IntSize rootSize(1000, 1000);
 
     myHostImpl->initializeRenderer(context.Pass());
     myHostImpl->setViewportSize(IntSize(rootSize.width(), rootSize.height()), IntSize(rootSize.width(), rootSize.height()));
 
-    OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
+    scoped_ptr<CCLayerImpl> root = CCLayerImpl::create(1);
     rootPtr = root.get();
 
     root->setAnchorPoint(FloatPoint(0, 0));
     root->setPosition(FloatPoint(0, 0));
     root->setBounds(rootSize);
     root->setContentBounds(rootSize);
     root->setDrawsContent(true);
     root->setMasksToBounds(true);
-    myHostImpl->setRootLayer(root.release());
+    myHostImpl->setRootLayer(root.Pass());
 
     addDrawingLayerTo(rootPtr, 2, IntRect(0, 0, 400, 400), &layerS1Ptr);
     layerS1Ptr->setForceRenderSurface(true);
     WebTransformationMatrix transform = layerS1Ptr->transform();
     transform.translate(200, 200);
     transform.rotate(45);
     transform.translate(-200, -200);
     layerS1Ptr->setTransform(transform);
 
     addDrawingLayerTo(layerS1Ptr, 3, IntRect(200, 0, 200, 400), 0); // L11
@@ skipping 55 matching lines @@
     CCLayerImpl* layerS1Ptr;
     CCLayerImpl* layerS2Ptr;
 
     scoped_ptr<CCGraphicsContext> context = FakeWebCompositorOutputSurface::create(adoptPtr(new PartialSwapContext)).PassAs<CCGraphicsContext>();
 
     IntSize rootSize(1000, 1000);
 
     myHostImpl->initializeRenderer(context.Pass());
     myHostImpl->setViewportSize(IntSize(rootSize.width(), rootSize.height()), IntSize(rootSize.width(), rootSize.height()));
 
-    OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
+    scoped_ptr<CCLayerImpl> root = CCLayerImpl::create(1);
     rootPtr = root.get();
 
     root->setAnchorPoint(FloatPoint(0, 0));
     root->setPosition(FloatPoint(0, 0));
     root->setBounds(rootSize);
     root->setContentBounds(rootSize);
     root->setDrawsContent(true);
     root->setMasksToBounds(true);
-    myHostImpl->setRootLayer(root.release());
+    myHostImpl->setRootLayer(root.Pass());
 
     addDrawingLayerTo(rootPtr, 2, IntRect(300, 300, 300, 300), &layerS1Ptr);
     layerS1Ptr->setForceRenderSurface(true);
 
     addDrawingLayerTo(layerS1Ptr, 3, IntRect(10, 10, 10, 10), 0); // L11
     addDrawingLayerTo(layerS1Ptr, 4, IntRect(0, 0, 30, 30), 0); // L12
 
     addDrawingLayerTo(rootPtr, 5, IntRect(550, 250, 300, 400), &layerS2Ptr);
     layerS2Ptr->setForceRenderSurface(true);
 
@@ skipping 76 matching lines @@
          |  | |   3               |
          |  | +-------------------+
          |  |           |     |
          |  +-----------+     |
          |                    |
          |                    |
          +--------------------+
 
          Layers 1, 2 have render surfaces
      */
-    OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
-    OwnPtr<CCTiledLayerImpl> child = CCTiledLayerImpl::create(2);
-    OwnPtr<CCLayerImpl> grandChild = CCLayerImpl::create(3);
+    scoped_ptr<CCLayerImpl> root = CCLayerImpl::create(1);
+    scoped_ptr<CCTiledLayerImpl> child = CCTiledLayerImpl::create(2);
+    scoped_ptr<CCLayerImpl> grandChild = CCLayerImpl::create(3);
 
     IntRect rootRect(0, 0, 100, 100);
     IntRect childRect(10, 10, 50, 50);
     IntRect grandChildRect(5, 5, 150, 150);
 
     scoped_ptr<CCGraphicsContext> context = FakeWebCompositorOutputSurface::create(adoptPtr(new PartialSwapContext)).PassAs<CCGraphicsContext>();
     myHostImpl->initializeRenderer(context.Pass());
 
     root->setAnchorPoint(FloatPoint(0, 0));
     root->setPosition(FloatPoint(rootRect.x(), rootRect.y()));
@@ skipping 17 matching lines @@
 
     grandChild->setAnchorPoint(FloatPoint(0, 0));
     grandChild->setPosition(IntPoint(grandChildRect.x(), grandChildRect.y()));
     grandChild->setBounds(IntSize(grandChildRect.width(), grandChildRect.height()));
     grandChild->setContentBounds(grandChild->bounds());
     grandChild->setDrawsContent(true);
 
     CCTiledLayerImpl* childPtr = child.get();
     CCRenderPass::Id childPassId(childPtr->id(), 0);
 
-    child->addChild(grandChild.release());
-    root->addChild(child.release());
-    myHostImpl->setRootLayer(root.release());
+    child->addChild(grandChild.Pass());
+    root->addChild(child.PassAs<CCLayerImpl>());
+    myHostImpl->setRootLayer(root.Pass());
     myHostImpl->setViewportSize(rootRect.size(), rootRect.size());
 
     EXPECT_FALSE(myHostImpl->renderer()->haveCachedResourcesForRenderPassId(childPassId));
 
     {
         CCLayerTreeHostImpl::FrameData frame;
         EXPECT_TRUE(myHostImpl->prepareToDraw(frame));
         myHostImpl->drawLayers(frame);
         myHostImpl->didDrawAllLayers(frame);
     }
@@ skipping 676 matching lines @@
     while (removeRenderPassesCases[testCaseIndex].name) {
         RenderPassRemovalTestData testData;
         configureRenderPassTestData(removeRenderPassesCases[testCaseIndex].initScript, testData, renderer.get());
         CCLayerTreeHostImpl::removeRenderPasses(CCLayerTreeHostImpl::CullRenderPassesWithCachedTextures(*renderer), testData);
         verifyRenderPassTestData(removeRenderPassesCases[testCaseIndex], testData);
         testCaseIndex++;
     }
 }
 
 } // namespace