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diff --git a/Source/WebKit/chromium/tests/TiledLayerChromiumTest.cpp b/Source/WebKit/chromium/tests/TiledLayerChromiumTest.cpp
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+++ b/Source/WebKit/chromium/tests/TiledLayerChromiumTest.cpp
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+/*
+ * Copyright (C) 2011 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include "TiledLayerChromium.h"
+
+#include "LayerTextureUpdater.h"
+#include "TextureManager.h"
+#include "cc/CCSingleThreadProxy.h" // For DebugScopedSetImplThread
+#include "cc/CCTextureUpdater.h"
+#include "cc/CCTiledLayerImpl.h"
+#include <gtest/gtest.h>
+
+using namespace WebCore;
+using namespace WTF;
+
+namespace {
+
+class FakeTextureAllocator : public TextureAllocator {
+public:
+    virtual unsigned createTexture(const IntSize&, GC3Denum) { return 0; }
+    virtual void deleteTexture(unsigned, const IntSize&, GC3Denum) { }
+};
+
+class FakeLayerTextureUpdater : public LayerTextureUpdater {
+public:
+    class Texture : public LayerTextureUpdater::Texture {
+    public:
+        Texture(PassOwnPtr<ManagedTexture> texture) : LayerTextureUpdater::Texture(texture) { }
+        virtual ~Texture() { }
+
+        virtual void updateRect(GraphicsContext3D*, TextureAllocator*, const IntRect&, const IntRect&) { }
+    };
+
+    FakeLayerTextureUpdater() { }
+    virtual ~FakeLayerTextureUpdater() { }
+
+    virtual PassOwnPtr<LayerTextureUpdater::Texture> createTexture(TextureManager* manager) { return adoptPtr(new Texture(ManagedTexture::create(manager))); }
+    virtual SampledTexelFormat sampledTexelFormat(GC3Denum) { return SampledTexelFormatRGBA; }
+    virtual void prepareToUpdate(const IntRect&, const IntSize&, int, float) { }
+};
+
+class FakeCCTiledLayerImpl : public CCTiledLayerImpl {
+public:
+    explicit FakeCCTiledLayerImpl(int id)
+        : CCTiledLayerImpl(id) { }
+    virtual ~FakeCCTiledLayerImpl() { }
+
+    bool hasTileAt(int i, int j)
+    {
+        return CCTiledLayerImpl::hasTileAt(i, j);
+    }
+};
+
+class FakeTiledLayerChromium : public TiledLayerChromium {
+public:
+    explicit FakeTiledLayerChromium(TextureManager* textureManager)
+        : TiledLayerChromium(0)
+        , m_fakeTextureUpdater(adoptRef(new FakeLayerTextureUpdater))
+        , m_textureManager(textureManager)
+    {
+        setTileSize(IntSize(100, 100));
+        setTextureFormat(GraphicsContext3D::RGBA);
+        setBorderTexelOption(CCLayerTilingData::NoBorderTexels);
+        setIsDrawable(true); // So that we don't get false positives if any of these tests expect to return false from drawsContent() for other reasons.
+    }
+    virtual ~FakeTiledLayerChromium() { }
+
+    void invalidateRect(const IntRect& rect)
+    {
+        TiledLayerChromium::invalidateRect(rect);
+    }
+
+    void prepareToUpdate(const IntRect& rect)
+    {
+        TiledLayerChromium::prepareToUpdate(rect);
+    }
+
+    void prepareToUpdateIdle(const IntRect& rect)
+    {
+        TiledLayerChromium::prepareToUpdateIdle(rect);
+    }
+
+    bool needsIdlePaint(const IntRect& rect)
+    {
+        return TiledLayerChromium::needsIdlePaint(rect);
+    }
+
+    virtual TextureManager* textureManager() const { return m_textureManager; }
+
+private:
+    virtual void createTextureUpdater(const CCLayerTreeHost*) { }
+
+    virtual LayerTextureUpdater* textureUpdater() const
+    {
+        return m_fakeTextureUpdater.get();
+    }
+
+    RefPtr<FakeLayerTextureUpdater> m_fakeTextureUpdater;
+    TextureManager* m_textureManager;
+};
+
+TEST(TiledLayerChromiumTest, pushDirtyTiles)
+{
+    OwnPtr<TextureManager> textureManager = TextureManager::create(4*1024*1024, 2*1024*1024, 1024);
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(textureManager.get()));
+    DebugScopedSetImplThread implThread;
+    RefPtr<FakeCCTiledLayerImpl> layerImpl = adoptRef(new FakeCCTiledLayerImpl(0));
+
+    FakeTextureAllocator textureAllocator;
+    CCTextureUpdater updater(&textureAllocator);
+
+    // The tile size is 100x100, so this invalidates and then paints two tiles.
+    layer->setBounds(IntSize(100, 200));
+    layer->invalidateRect(IntRect(0, 0, 100, 200));
+    layer->prepareToUpdate(IntRect(0, 0, 100, 200));
+    layer->updateCompositorResources(0, updater);
+    layer->pushPropertiesTo(layerImpl.get());
+
+    // We should have both tiles on the impl side.
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 0));
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 1));
+
+    textureManager->unprotectAllTextures();
+
+    // Invalidates both tiles...
+    layer->invalidateRect(IntRect(0, 0, 100, 200));
+    // ....but then only update one of them.
+    layer->prepareToUpdate(IntRect(0, 0, 100, 100));
+    layer->updateCompositorResources(0, updater);
+    layer->pushPropertiesTo(layerImpl.get());
+
+    // We should only have the first tile since the other tile was invalidated but not painted.
+    EXPECT_TRUE(layerImpl->hasTileAt(0, 0));
+    EXPECT_FALSE(layerImpl->hasTileAt(0, 1));
+}
+
+TEST(TiledLayerChromiumTest, pushIdlePaintTiles)
+{
+    OwnPtr<TextureManager> textureManager = TextureManager::create(4*1024*1024, 2*1024*1024, 1024);
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(textureManager.get()));
+    DebugScopedSetImplThread implThread;
+    RefPtr<FakeCCTiledLayerImpl> layerImpl = adoptRef(new FakeCCTiledLayerImpl(0));
+
+    FakeTextureAllocator textureAllocator;
+    CCTextureUpdater updater(&textureAllocator);
+
+    // The tile size is 100x100. Setup 5x5 tiles with one visible tile in the center.
+    IntSize contentBounds(500, 500);
+    IntRect contentRect(IntPoint::zero(), contentBounds);
+    IntRect visibleRect(200, 200, 100, 100);
+
+    // This invalidates 25 tiles and then paints one visible tile.
+    layer->setBounds(contentBounds);
+    layer->setVisibleLayerRect(visibleRect);
+    layer->invalidateRect(contentRect);
+    layer->prepareToUpdate(visibleRect);
+
+    // We should need idle-painting for 3x3 tiles in the center.
+    EXPECT_TRUE(layer->needsIdlePaint(visibleRect));
+
+    layer->updateCompositorResources(0, updater);
+    layer->pushPropertiesTo(layerImpl.get());
+
+    // We should have one tile on the impl side.
+    EXPECT_TRUE(layerImpl->hasTileAt(2, 2));
+
+    textureManager->unprotectAllTextures();
+
+    // For the next four updates, we should detect we still need idle painting.
+    for (int i = 0; i < 4; i++) {
+        layer->prepareToUpdate(visibleRect);
+        EXPECT_TRUE(layer->needsIdlePaint(visibleRect));
+        layer->prepareToUpdateIdle(visibleRect);
+        layer->updateCompositorResources(0, updater);
+        layer->pushPropertiesTo(layerImpl.get());
+        textureManager->unprotectAllTextures();
+    }
+
+    // After four passes of idle painting, we should be finished painting
+    EXPECT_FALSE(layer->needsIdlePaint(visibleRect));
+
+    // We should have one tile surrounding the visible tile on all sides, but no other tiles.
+    IntRect idlePaintTiles(1, 1, 3, 3);
+    for (int i = 0; i < 5; i++) {
+        for (int j = 0; j < 5; j++) {
+            if (idlePaintTiles.contains(i, j))
+                EXPECT_TRUE(layerImpl->hasTileAt(i, j));
+            else
+                EXPECT_FALSE(layerImpl->hasTileAt(i, j));
+        }
+    }
+}
+
+
+TEST(TiledLayerChromiumTest, idlePaintOutOfMemory)
+{
+    // The tile size is 100x100. Setup 5x5 tiles with one 1x1 visible tile in the center.
+    IntSize contentBounds(300, 300);
+    IntRect contentRect(IntPoint::zero(), contentBounds);
+    IntRect visibleRect(100, 100, 100, 100);
+
+    // We have enough memory for only the visible rect, so we will run out of memory in first idle paint.
+    int memoryLimit = 4 * 100 * 100; // 2 tiles, 4 bytes per pixel.
+
+    OwnPtr<TextureManager> textureManager = TextureManager::create(memoryLimit, memoryLimit / 2, 1024);
+    RefPtr<FakeTiledLayerChromium> layer = adoptRef(new FakeTiledLayerChromium(textureManager.get()));
+    DebugScopedSetImplThread implThread;
+    RefPtr<FakeCCTiledLayerImpl> layerImpl = adoptRef(new FakeCCTiledLayerImpl(0));
+
+    FakeTextureAllocator textureAllocator;
+    CCTextureUpdater updater(&textureAllocator);
+
+    // This invalidates 9 tiles and then paints one visible tile.
+    layer->setBounds(contentBounds);
+    layer->setVisibleLayerRect(visibleRect);
+    layer->invalidateRect(contentRect);
+    layer->prepareToUpdate(visibleRect);
+
+    // We should need idle-painting for 3x3 tiles surounding visible tile.
+    EXPECT_TRUE(layer->needsIdlePaint(visibleRect));
+
+    layer->updateCompositorResources(0, updater);
+    layer->pushPropertiesTo(layerImpl.get());
+
+    // We should have one tile on the impl side.
+    EXPECT_TRUE(layerImpl->hasTileAt(1, 1));
+
+    textureManager->unprotectAllTextures();
+    layer->prepareToUpdate(visibleRect);
+    layer->prepareToUpdateIdle(visibleRect);
+
+    // We shouldn't signal we need another idle paint after we run out of memory.
+    EXPECT_FALSE(layer->needsIdlePaint(visibleRect));
+
+    layer->updateCompositorResources(0, updater);
+    layer->pushPropertiesTo(layerImpl.get());
+}
+
+} // namespace