Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java

Index: chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java
diff --git a/chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java b/chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java
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@@ -0,0 +1,1105 @@
+// Copyright 2015 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.
+
+package org.chromium.chrome.browser.compositor;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.os.Bundle;
+import android.os.Handler;
+import android.support.v4.view.ViewCompat;
+import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat;
+import android.support.v4.widget.ExploreByTouchHelper;
+import android.util.AttributeSet;
+import android.util.Pair;
+import android.view.MotionEvent;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.accessibility.AccessibilityEvent;
+import android.view.inputmethod.InputMethodManager;
+import android.widget.FrameLayout;
+
+import com.google.android.apps.chrome.R;
+
+import org.chromium.base.SysUtils;
+import org.chromium.base.TraceEvent;
+import org.chromium.base.annotations.SuppressFBWarnings;
+import org.chromium.chrome.browser.EmptyTabObserver;
+import org.chromium.chrome.browser.Tab;
+import org.chromium.chrome.browser.TabObserver;
+import org.chromium.chrome.browser.compositor.Invalidator.Client;
+import org.chromium.chrome.browser.compositor.layouts.LayoutManager;
+import org.chromium.chrome.browser.compositor.layouts.LayoutManagerHost;
+import org.chromium.chrome.browser.compositor.layouts.LayoutRenderHost;
+import org.chromium.chrome.browser.compositor.layouts.components.VirtualView;
+import org.chromium.chrome.browser.compositor.layouts.content.ContentOffsetProvider;
+import org.chromium.chrome.browser.compositor.layouts.content.TabContentManager;
+import org.chromium.chrome.browser.contextualsearch.ContextualSearchManagementDelegate;
+import org.chromium.chrome.browser.device.DeviceClassManager;
+import org.chromium.chrome.browser.fullscreen.ChromeFullscreenManager;
+import org.chromium.chrome.browser.fullscreen.ChromeFullscreenManager.FullscreenListener;
+import org.chromium.chrome.browser.tabmodel.EmptyTabModelSelectorObserver;
+import org.chromium.chrome.browser.tabmodel.TabCreatorManager;
+import org.chromium.chrome.browser.tabmodel.TabModelSelector;
+import org.chromium.chrome.browser.widget.ControlContainer;
+import org.chromium.content.browser.ContentReadbackHandler;
+import org.chromium.content.browser.ContentViewCore;
+import org.chromium.content.browser.SPenSupport;
+import org.chromium.ui.UiUtils;
+import org.chromium.ui.base.DeviceFormFactor;
+import org.chromium.ui.base.WindowAndroid;
+import org.chromium.ui.resources.ResourceManager;
+import org.chromium.ui.resources.dynamics.DynamicResourceLoader;
+import org.chromium.ui.resources.dynamics.ViewResourceAdapter;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * This class holds a {@link CompositorView}. This level of indirection is needed to benefit from
+ * the {@link android.view.ViewGroup#onInterceptTouchEvent(android.view.MotionEvent)} capability on
+ * available on {@link android.view.ViewGroup}s.
+ * This class also holds the {@link LayoutManager} responsible to describe the items to be
+ * drawn by the UI compositor on the native side.
+ */
+public class CompositorViewHolder extends FrameLayout
+        implements LayoutManagerHost, LayoutRenderHost, Invalidator.Host, FullscreenListener {
+    private static List<View> sCachedViewList = new ArrayList<View>();
+    private static List<ContentViewCore> sCachedCVCList = new ArrayList<ContentViewCore>();
+
+    private boolean mIsKeyboardShowing = false;
+
+    private final Invalidator mInvalidator = new Invalidator();
+    private LayoutManager mLayoutManager;
+    private LayerTitleCache mLayerTitleCache;
+    private CompositorView mCompositorView;
+
+    private boolean mContentOverlayVisiblity = true;
+
+    private int mPendingSwapBuffersCount;
+
+    private final ArrayList<Invalidator.Client> mPendingInvalidations =
+            new ArrayList<Invalidator.Client>();
+    private boolean mSkipInvalidation = false;
+
+    private boolean mSkipNextToolbarTextureUpdate = false;
+
+    /**
+     * A task to be performed after a resize event.
+     */
+    private Runnable mPostHideKeyboardTask;
+
+    private TabModelSelector mTabModelSelector;
+    private ChromeFullscreenManager mFullscreenManager;
+    private View mAccessibilityView;
+    private CompositorAccessibilityProvider mNodeProvider;
+    private boolean mFullscreenTouchEvent = false;
+    private float mLastContentOffset = 0;
+    private float mLastVisibleContentOffset = 0;
+
+    /** The toolbar control container. **/
+    private ControlContainer mControlContainer;
+
+    /** The currently visible Tab. */
+    private Tab mTabVisible;
+
+    /** The currently attached View. */
+    private View mView;
+
+    private TabObserver mTabObserver;
+    private boolean mEnableCompositorTabStrip;
+
+    // Cache objects that should not be created frequently.
+    private final Rect mCacheViewport = new Rect();
+    private final Rect mCacheVisibleViewport = new Rect();
+
+    // If we've drawn at least one frame.
+    private boolean mHasDrawnOnce = false;
+
+    /**
+     * This view is created on demand to display debugging information.
+     */
+    private static class DebugOverlay extends View {
+        private final List<Pair<Rect, Integer>> mRectangles = new ArrayList<Pair<Rect, Integer>>();
+        private final Paint mPaint = new Paint();
+        private boolean mFirstPush = true;
+
+        /**
+         * @param context The current Android's context.
+         */
+        public DebugOverlay(Context context) {
+            super(context);
+        }
+
+        /**
+         * Pushes a rectangle to be drawn on the screen on top of everything.
+         *
+         * @param rect  The rectangle to be drawn on screen
+         * @param color The color of the rectangle
+         */
+        public void pushRect(Rect rect, int color) {
+            if (mFirstPush) {
+                mRectangles.clear();
+                mFirstPush = false;
+            }
+            mRectangles.add(new Pair<Rect, Integer>(rect, color));
+            invalidate();
+        }
+
+        @SuppressFBWarnings("NP_UNWRITTEN_PUBLIC_OR_PROTECTED_FIELD")
+        @Override
+        protected void onDraw(Canvas canvas) {
+            for (int i = 0; i < mRectangles.size(); i++) {
+                mPaint.setColor(mRectangles.get(i).second);
+                canvas.drawRect(mRectangles.get(i).first, mPaint);
+            }
+            mFirstPush = true;
+        }
+    }
+
+    private DebugOverlay mDebugOverlay;
+
+    private View mUrlBar;
+
+    /**
+     * Creates a {@link CompositorView}.
+     * @param c The Context to create this {@link CompositorView} in.
+     */
+    public CompositorViewHolder(Context c) {
+        super(c);
+
+        internalInit();
+    }
+
+    /**
+     * Creates a {@link CompositorView}.
+     * @param c     The Context to create this {@link CompositorView} in.
+     * @param attrs The AttributeSet used to create this {@link CompositorView}.
+     */
+    public CompositorViewHolder(Context c, AttributeSet attrs) {
+        super(c, attrs);
+
+        internalInit();
+    }
+
+    private void internalInit() {
+        mTabObserver = new EmptyTabObserver() {
+            @Override
+            public void onContentChanged(Tab tab) {
+                CompositorViewHolder.this.onContentChanged();
+            }
+
+            @Override
+            public void onOverlayContentViewCoreAdded(Tab tab, ContentViewCore content) {
+                initializeContentViewCore(content);
+                setSizeOfUnattachedView(content.getContainerView());
+            }
+        };
+
+        mEnableCompositorTabStrip = DeviceFormFactor.isTablet(getContext());
+
+        addOnLayoutChangeListener(new OnLayoutChangeListener() {
+            @Override
+            public void onLayoutChange(View v, int left, int top, int right, int bottom,
+                    int oldLeft, int oldTop, int oldRight, int oldBottom) {
+                propagateViewportToLayouts(right - left, bottom - top);
+
+                // If there's an event that needs to occur after the keyboard is hidden, post
+                // it as a delayed event.  Otherwise this happens in the midst of the
+                // ContentView's relayout, which causes the ContentView to relayout on top of the
+                // stack view.  The 30ms is arbitrary, hoping to let the view get one repaint
+                // in so the full page is shown.
+                if (mPostHideKeyboardTask != null) {
+                    new Handler().postDelayed(mPostHideKeyboardTask, 30);
+                    mPostHideKeyboardTask = null;
+                }
+            }
+        });
+
+        mCompositorView = new CompositorView(getContext(), this);
+        addView(mCompositorView,
+                new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
+    }
+
+    /**
+     * @param layoutManager The {@link LayoutManager} instance that will be driving what
+     *                      shows in this {@link CompositorViewHolder}.
+     */
+    public void setLayoutManager(LayoutManager layoutManager) {
+        mLayoutManager = layoutManager;
+        propagateViewportToLayouts(getWidth(), getHeight());
+    }
+
+    /**
+     * @param view The root view of the hierarchy.
+     */
+    public void setRootView(View view) {
+        mCompositorView.setRootView(view);
+    }
+
+    /**
+     * @param controlContainer The ControlContainer.
+     */
+    public void setControlContainer(ControlContainer controlContainer) {
+        DynamicResourceLoader loader = mCompositorView.getResourceManager() != null
+                ? mCompositorView.getResourceManager().getDynamicResourceLoader()
+                : null;
+        if (loader != null && mControlContainer != null) {
+            loader.unregisterResource(R.id.control_container);
+            loader.unregisterResource(R.id.progress);
+        }
+        mControlContainer = controlContainer;
+        if (loader != null && mControlContainer != null) {
+            loader.registerResource(
+                    R.id.control_container, mControlContainer.getToolbarResourceAdapter());
+
+            ViewResourceAdapter progressAdapter = mControlContainer.getProgressResourceAdapter();
+            if (progressAdapter != null) {
+                loader.registerResource(R.id.progress, progressAdapter);
+            }
+        }
+    }
+
+    /**
+     * @return The CompositorView.
+     */
+    public SurfaceHolder.Callback2 getSurfaceHolderCallback2() {
+        return mCompositorView;
+    }
+
+    /**
+     * Reset command line flags. This gets called after the native library finishes
+     * loading.
+     */
+    public void resetFlags() {
+        mCompositorView.resetFlags();
+    }
+
+    /**
+     * Should be called for cleanup when the CompositorView instance is no longer used.
+     */
+    public void shutDown() {
+        setTab(null);
+        if (mLayerTitleCache != null) mLayerTitleCache.shutDown();
+        mCompositorView.shutDown();
+    }
+
+    /**
+     * This is called when the native library are ready.
+     */
+    public void onNativeLibraryReady(
+            WindowAndroid windowAndroid, TabContentManager tabContentManager) {
+        assert mLayerTitleCache == null : "Should be called once";
+
+        if (DeviceClassManager.enableLayerDecorationCache()) {
+            mLayerTitleCache = new LayerTitleCache(getContext());
+        }
+
+        mCompositorView.initNativeCompositor(
+                SysUtils.isLowEndDevice(), windowAndroid, mLayerTitleCache, tabContentManager);
+
+        if (mLayerTitleCache != null) {
+            mLayerTitleCache.setResourceManager(getResourceManager());
+        }
+
+        if (mControlContainer != null) {
+            mCompositorView.getResourceManager().getDynamicResourceLoader().registerResource(
+                    R.id.control_container, mControlContainer.getToolbarResourceAdapter());
+
+            ViewResourceAdapter progressAdapter = mControlContainer.getProgressResourceAdapter();
+            if (progressAdapter != null) {
+                mCompositorView.getResourceManager().getDynamicResourceLoader().registerResource(
+                        R.id.progress, progressAdapter);
+            }
+        }
+    }
+
+    @Override
+    public ResourceManager getResourceManager() {
+        return mCompositorView.getResourceManager();
+    }
+
+    public ContentOffsetProvider getContentOffsetProvider() {
+        return mCompositorView;
+    }
+
+    /**
+     * @return The content readback handler.
+     */
+    public ContentReadbackHandler getContentReadbackHandler() {
+        if (mCompositorView == null) return null;
+        return mCompositorView.getContentReadbackHandler();
+    }
+
+    /**
+     * @return The {@link DynamicResourceLoader} for registering resources.
+     */
+    public DynamicResourceLoader getDynamicResourceLoader() {
+        return mCompositorView.getResourceManager().getDynamicResourceLoader();
+    }
+
+    /**
+     * @return The {@link Invalidator} instance that is driven by this {@link CompositorViewHolder}.
+     */
+    public Invalidator getInvalidator() {
+        return mInvalidator;
+    }
+
+    @Override
+    public boolean onInterceptTouchEvent(MotionEvent e) {
+        super.onInterceptTouchEvent(e);
+
+        if (mLayoutManager == null) return false;
+
+        mFullscreenTouchEvent = false;
+        if (mFullscreenManager != null && mFullscreenManager.onInterceptMotionEvent(e)
+                && !mEnableCompositorTabStrip) {
+            // Don't eat the event if the new tab strip is enabled.
+            mFullscreenTouchEvent = true;
+            return true;
+        }
+
+        setContentViewMotionEventOffsets(e, false);
+        return mLayoutManager.onInterceptTouchEvent(e, mIsKeyboardShowing);
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent e) {
+        if (mFullscreenManager != null) mFullscreenManager.onMotionEvent(e);
+        if (mFullscreenTouchEvent) return true;
+        boolean consumed = mLayoutManager != null && mLayoutManager.onTouchEvent(e);
+        setContentViewMotionEventOffsets(e, true);
+        return consumed;
+    }
+
+    @Override
+    public boolean onInterceptHoverEvent(MotionEvent e) {
+        setContentViewMotionEventOffsets(e, true);
+        return super.onInterceptHoverEvent(e);
+    }
+
+    @Override
+    public boolean dispatchHoverEvent(MotionEvent e) {
+        if (mNodeProvider != null) {
+            if (mNodeProvider.dispatchHoverEvent(e)) {
+                return true;
+            }
+        }
+        return super.dispatchHoverEvent(e);
+    }
+
+    /**
+     * @return The {@link LayoutManager} associated with this view.
+     */
+    public LayoutManager getLayoutManager() {
+        return mLayoutManager;
+    }
+
+    /**
+     * @return The SurfaceView used by the Compositor.
+     */
+    public SurfaceView getSurfaceView() {
+        return mCompositorView;
+    }
+
+    @Override
+    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
+        super.onSizeChanged(w, h, oldw, oldh);
+        if (mLayoutManager == null) return;
+
+        sCachedViewList.clear();
+        mLayoutManager.getActiveLayout().getAllViews(sCachedViewList);
+
+        boolean resized = false;
+        for (int i = 0; i < sCachedViewList.size(); i++) {
+            resized |= setSizeOfUnattachedView(sCachedViewList.get(i));
+        }
+        sCachedViewList.clear();
+
+        if (resized) requestRender();
+    }
+
+    @Override
+    public void onPhysicalBackingSizeChanged(int width, int height) {
+        if (mLayoutManager == null) return;
+
+        sCachedCVCList.clear();
+        mLayoutManager.getActiveLayout().getAllContentViewCores(sCachedCVCList);
+
+        for (int i = 0; i < sCachedCVCList.size(); i++) {
+            sCachedCVCList.get(i).onPhysicalBackingSizeChanged(width, height);
+        }
+        sCachedCVCList.clear();
+    }
+
+    @Override
+    public void onOverdrawBottomHeightChanged(int overdrawHeight) {
+        if (mLayoutManager == null) return;
+
+        sCachedCVCList.clear();
+        mLayoutManager.getActiveLayout().getAllContentViewCores(sCachedCVCList);
+
+        for (int i = 0; i < sCachedCVCList.size(); i++) {
+            sCachedCVCList.get(i).onOverdrawBottomHeightChanged(overdrawHeight);
+        }
+        sCachedCVCList.clear();
+
+        mSkipNextToolbarTextureUpdate = true;
+        requestRender();
+    }
+
+    @Override
+    public int getCurrentOverdrawBottomHeight() {
+        if (mTabVisible != null) {
+            float overdrawBottomHeight = mTabVisible.getFullscreenOverdrawBottomHeightPix();
+            if (!Float.isNaN(overdrawBottomHeight)) {
+                return (int) overdrawBottomHeight;
+            }
+        }
+        return mCompositorView.getOverdrawBottomHeight();
+    }
+
+    /**
+     * Called whenever the host activity is started.
+     */
+    public void onStart() {
+        if (mFullscreenManager != null) {
+            mLastContentOffset = mFullscreenManager.getContentOffset();
+            mLastVisibleContentOffset = mFullscreenManager.getVisibleContentOffset();
+            mFullscreenManager.addListener(this);
+        }
+        requestRender();
+    }
+
+    /**
+     * Called whenever the host activity is stopped.
+     */
+    public void onStop() {
+        if (mFullscreenManager != null) mFullscreenManager.removeListener(this);
+    }
+
+    @Override
+    public void onContentOffsetChanged(float offset) {
+        mLastContentOffset = offset;
+        propagateViewportToLayouts(getWidth(), getHeight());
+    }
+
+    @Override
+    public void onVisibleContentOffsetChanged(float offset) {
+        mLastVisibleContentOffset = offset;
+        propagateViewportToLayouts(getWidth(), getHeight());
+        requestRender();
+    }
+
+    @Override
+    public void onToggleOverlayVideoMode(boolean enabled) {
+        if (mCompositorView != null) {
+            mCompositorView.setOverlayVideoMode(enabled);
+        }
+    }
+
+    private void setContentViewMotionEventOffsets(MotionEvent e, boolean canClear) {
+        // TODO(dtrainor): Factor this out to LayoutDriver.
+        if (e == null || mTabVisible == null) return;
+
+        ContentViewCore contentViewCore = mTabVisible.getContentViewCore();
+        if (contentViewCore == null) return;
+
+        int actionMasked = e.getActionMasked();
+
+        if (SPenSupport.isSPenSupported(getContext())) {
+            actionMasked = SPenSupport.convertSPenEventAction(actionMasked);
+        }
+
+        if (actionMasked == MotionEvent.ACTION_DOWN
+                || actionMasked == MotionEvent.ACTION_HOVER_ENTER) {
+            if (mLayoutManager != null) mLayoutManager.getViewportPixel(mCacheViewport);
+            contentViewCore.setCurrentMotionEventOffsets(-mCacheViewport.left, -mCacheViewport.top);
+        } else if (canClear && (actionMasked == MotionEvent.ACTION_UP
+                                       || actionMasked == MotionEvent.ACTION_CANCEL
+                                       || actionMasked == MotionEvent.ACTION_HOVER_EXIT)) {
+            contentViewCore.setCurrentMotionEventOffsets(0.f, 0.f);
+        }
+    }
+
+    private void propagateViewportToLayouts(int contentWidth, int contentHeight) {
+        int heightMinusTopControls = contentHeight - getTopControlsHeightPixels();
+        mCacheViewport.set(0, (int) mLastContentOffset, contentWidth, contentHeight);
+        mCacheVisibleViewport.set(0, (int) mLastVisibleContentOffset, contentWidth, contentHeight);
+        // TODO(changwan): check if this can be merged with setContentMotionEventOffsets.
+        if (mTabVisible != null && mTabVisible.getContentViewCore() != null) {
+            mTabVisible.getContentViewCore().setSmartClipOffsets(
+                    -mCacheViewport.left, -mCacheViewport.top);
+        }
+        if (mLayoutManager != null) {
+            mLayoutManager.pushNewViewport(
+                    mCacheViewport, mCacheVisibleViewport, heightMinusTopControls);
+        }
+    }
+
+    /**
+     * To be called once a frame before commit.
+     */
+    @Override
+    public void onCompositorLayout() {
+        TraceEvent.begin("CompositorViewHolder:layout");
+        if (mLayoutManager != null) {
+            mLayoutManager.onUpdate();
+            mCompositorView.finalizeLayers(mLayoutManager, mSkipNextToolbarTextureUpdate);
+            // TODO(changwan): Check if this hack can be removed.
+            // This is a hack to draw one more frame if the screen just rotated for Nexus 10 + L.
+            // See http://crbug/440469 for more.
+            if (mSkipNextToolbarTextureUpdate) {
+                requestRender();
+            }
+        }
+
+        TraceEvent.end("CompositorViewHolder:layout");
+        mSkipNextToolbarTextureUpdate = false;
+    }
+
+    @Override
+    public void requestRender() {
+        mCompositorView.requestRender();
+    }
+
+    @Override
+    public void onSurfaceCreated() {
+        mPendingSwapBuffersCount = 0;
+        flushInvalidation();
+    }
+
+    @Override
+    public void onSwapBuffersCompleted(int pendingSwapBuffersCount) {
+        TraceEvent.instant("onSwapBuffersCompleted");
+
+        // Wait until the second frame to turn off the placeholder background on
+        // tablets so the tab strip has time to start drawing.
+        final ViewGroup controlContainer = (ViewGroup) mControlContainer;
+        if (controlContainer != null && controlContainer.getBackground() != null && mHasDrawnOnce) {
+            post(new Runnable() {
+                @Override
+                public void run() {
+                    controlContainer.setBackgroundResource(0);
+                }
+            });
+        }
+
+        mHasDrawnOnce = true;
+
+        mPendingSwapBuffersCount = pendingSwapBuffersCount;
+
+        if (!mSkipInvalidation || pendingSwapBuffersCount == 0) flushInvalidation();
+        mSkipInvalidation = !mSkipInvalidation;
+    }
+
+    @Override
+    public void setContentOverlayVisibility(boolean show) {
+        if (show != mContentOverlayVisiblity) {
+            mContentOverlayVisiblity = show;
+            updateContentOverlayVisibility(mContentOverlayVisiblity);
+        }
+    }
+
+    @Override
+    public LayoutRenderHost getLayoutRenderHost() {
+        return this;
+    }
+
+    @Override
+    public int getLayoutTabsDrawnCount() {
+        return mCompositorView.getLastLayerCount();
+    }
+
+    @Override
+    public void pushDebugRect(Rect rect, int color) {
+        if (mDebugOverlay == null) {
+            mDebugOverlay = new DebugOverlay(getContext());
+            addView(mDebugOverlay);
+        }
+        mDebugOverlay.pushRect(rect, color);
+    }
+
+    @Override
+    public void loadPersitentTextureDataIfNeeded() {}
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+        mIsKeyboardShowing = UiUtils.isKeyboardShowing(getContext(), this);
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int l, int t, int r, int b) {
+        if (changed) {
+            propagateViewportToLayouts(r - l, b - t);
+        }
+        super.onLayout(changed, l, t, r, b);
+
+        invalidateAccessibilityProvider();
+    }
+
+    @Override
+    public void clearChildFocus(View child) {
+        // Override this method so that the ViewRoot doesn't go looking for a new
+        // view to take focus. It will find the URL Bar, focus it, then refocus this
+        // later, causing a keyboard flicker.
+    }
+
+    @Override
+    public ChromeFullscreenManager getFullscreenManager() {
+        return mFullscreenManager;
+    }
+
+    /**
+     * Sets a fullscreen handler.
+     * @param fullscreen A fullscreen handler.
+     */
+    public void setFullscreenHandler(ChromeFullscreenManager fullscreen) {
+        mFullscreenManager = fullscreen;
+        if (mFullscreenManager != null) {
+            mLastContentOffset = mFullscreenManager.getContentOffset();
+            mLastVisibleContentOffset = mFullscreenManager.getVisibleContentOffset();
+            mFullscreenManager.addListener(this);
+        }
+        propagateViewportToLayouts(getWidth(), getHeight());
+    }
+
+    /**
+     * Note that the returned rect is reused for other calls.
+     */
+    @Override
+    public Rect getVisibleViewport(Rect rect) {
+        if (rect == null) rect = new Rect();
+        rect.set(0, (int) mLastVisibleContentOffset, getWidth(), getHeight());
+        return rect;
+    }
+
+    @Override
+    public boolean areTopControlsPermanentlyHidden() {
+        return mFullscreenManager != null && mFullscreenManager.areTopControlsPermanentlyHidden();
+    }
+
+    @Override
+    public int getTopControlsHeightPixels() {
+        return mFullscreenManager != null ? mFullscreenManager.getTopControlsHeight() : 0;
+    }
+
+    /**
+     * Sets the URL bar. This is needed so that the ContentViewHolder can find out
+     * whether it can claim focus.
+     */
+    public void setUrlBar(View urlBar) {
+        mUrlBar = urlBar;
+    }
+
+    @Override
+    protected void onAttachedToWindow() {
+        mInvalidator.set(this);
+        super.onAttachedToWindow();
+    }
+
+    @Override
+    protected void onDetachedFromWindow() {
+        if (mLayoutManager != null) mLayoutManager.destroy();
+        flushInvalidation();
+        mInvalidator.set(null);
+        super.onDetachedFromWindow();
+
+        // Removes the accessibility node provider from this view.
+        if (mNodeProvider != null) {
+            mAccessibilityView.setAccessibilityDelegate(null);
+            mNodeProvider = null;
+            removeView(mAccessibilityView);
+            mAccessibilityView = null;
+        }
+    }
+
+    /**
+     * @return True if the currently active content view is shown in the normal interactive mode.
+     */
+    public boolean isTabInteractive() {
+        return mLayoutManager != null && mLayoutManager.getActiveLayout() != null
+                && mLayoutManager.getActiveLayout().isTabInteractive() && mContentOverlayVisiblity
+                && mView != null;
+    }
+
+    /**
+     * Hides the the keyboard if it was opened for the ContentView.
+     * @param postHideTask A task to run after the keyboard is done hiding and the view's
+     *         layout has been updated.  If the keyboard was not shown, the task will run
+     *         immediately.
+     */
+    public void hideKeyboard(Runnable postHideTask) {
+        // When this is called we actually want to hide the keyboard whatever owns it.
+        // This includes hiding the keyboard, and dropping focus from the URL bar.
+        // See http://crbug/236424
+        // TODO(aberent) Find a better place to put this, possibly as part of a wider
+        // redesign of focus control.
+        if (mUrlBar != null) mUrlBar.clearFocus();
+        boolean wasVisible = false;
+        if (hasFocus()) {
+            wasVisible = UiUtils.hideKeyboard(this);
+        }
+        if (wasVisible) {
+            mPostHideKeyboardTask = postHideTask;
+        } else {
+            postHideTask.run();
+        }
+    }
+
+    /**
+     * Sets the appropriate objects this class should represent.
+     * @param tabModelSelector        The {@link TabModelSelector} this View should hold and
+     *                                represent.
+     * @param tabCreatorManager       The {@link TabCreatorManager} for this view.
+     * @param tabContentManager       The {@link TabContentManager} for the tabs.
+     * @param androidContentContainer The {@link ViewGroup} the {@link LayoutManager} should bind
+     *                                Android content to.
+     * @param contextualSearchManager A {@link ContextualSearchManagementDelegate} instance.
+     */
+    public void onFinishNativeInitialization(TabModelSelector tabModelSelector,
+            TabCreatorManager tabCreatorManager, TabContentManager tabContentManager,
+            ViewGroup androidContentContainer,
+            ContextualSearchManagementDelegate contextualSearchManager) {
+        assert mLayoutManager != null;
+        mLayoutManager.init(tabModelSelector, tabCreatorManager, tabContentManager,
+                androidContentContainer, contextualSearchManager,
+                mCompositorView.getResourceManager().getDynamicResourceLoader());
+        mTabModelSelector = tabModelSelector;
+        tabModelSelector.addObserver(new EmptyTabModelSelectorObserver() {
+            @Override
+            public void onChange() {
+                onContentChanged();
+            }
+
+            @Override
+            public void onNewTabCreated(Tab tab) {
+                initializeTab(tab);
+            }
+        });
+
+        onContentChanged();
+    }
+
+    private void updateContentOverlayVisibility(boolean show) {
+        if (mView == null) return;
+
+        sCachedCVCList.clear();
+        if (mLayoutManager != null) {
+            mLayoutManager.getActiveLayout().getAllContentViewCores(sCachedCVCList);
+        }
+        if (show) {
+            if (mView.getParent() != this) {
+                // Make sure the view isn't a child of something else before we attempt to add it.
+                if (mView.getParent() != null && mView.getParent() instanceof ViewGroup) {
+                    ((ViewGroup) mView.getParent()).removeView(mView);
+                }
+
+                for (int i = 0; i < sCachedCVCList.size(); i++) {
+                    ContentViewCore content = sCachedCVCList.get(i);
+                    assert content.isAlive();
+                    content.getContainerView().setVisibility(View.VISIBLE);
+                    if (mFullscreenManager != null) {
+                        mFullscreenManager.updateContentViewViewportSize(content);
+                    }
+                }
+
+                FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(
+                        LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
+                addView(mView, layoutParams);
+                setFocusable(false);
+                setFocusableInTouchMode(false);
+
+                // Claim focus for the new view unless the user is currently using the URL bar.
+                if (mUrlBar == null || !mUrlBar.hasFocus()) mView.requestFocus();
+            }
+        } else {
+            if (mView.getParent() == this) {
+                setFocusable(true);
+                setFocusableInTouchMode(true);
+
+                for (int i = 0; i < sCachedCVCList.size(); i++) {
+                    ContentViewCore content = sCachedCVCList.get(i);
+                    if (content.isAlive()) content.getContainerView().setVisibility(View.INVISIBLE);
+                }
+
+                if (hasFocus()) {
+                    InputMethodManager manager = (InputMethodManager) getContext().getSystemService(
+                            Context.INPUT_METHOD_SERVICE);
+                    if (manager.isActive(this)) {
+                        manager.hideSoftInputFromWindow(getWindowToken(), 0, null);
+                    }
+                }
+                removeView(mView);
+            }
+        }
+        sCachedCVCList.clear();
+    }
+
+    @Override
+    public void onContentChanged() {
+        if (mTabModelSelector == null) {
+            // Not yet initialized, onContentChanged() will eventually get called by
+            // setTabModelSelector.
+            return;
+        }
+        Tab tab = mTabModelSelector.getCurrentTab();
+        setTab(tab);
+    }
+
+    @Override
+    public void onContentViewCoreAdded(ContentViewCore content) {
+        // TODO(dtrainor): Look into rolling this into onContentChanged().
+        initializeContentViewCore(content);
+        setSizeOfUnattachedView(content.getContainerView());
+    }
+
+    private void setTab(Tab tab) {
+        if (tab != null && tab.isFrozen()) tab.unfreezeContents();
+
+        View newView = tab != null ? tab.getView() : null;
+        if (mView == newView) return;
+
+        // TODO(dtrainor): Look into changing this only if the views differ, but still parse the
+        // ContentViewCore list even if they're the same.
+        updateContentOverlayVisibility(false);
+
+        if (mTabVisible != tab) {
+            if (mTabVisible != null) mTabVisible.removeObserver(mTabObserver);
+            if (tab != null) tab.addObserver(mTabObserver);
+        }
+
+        mTabVisible = tab;
+        mView = newView;
+
+        updateContentOverlayVisibility(mContentOverlayVisiblity);
+
+        if (mTabVisible != null) initializeTab(mTabVisible);
+    }
+
+    /**
+     * Sets the correct size for all {@link View}s on {@code tab} and sets the correct rendering
+     * parameters on all {@link ContentViewCore}s on {@code tab}.
+     * @param tab The {@link Tab} to initialize.
+     */
+    private void initializeTab(Tab tab) {
+        sCachedCVCList.clear();
+        if (mLayoutManager != null) {
+            mLayoutManager.getActiveLayout().getAllContentViewCores(sCachedCVCList);
+        }
+
+        for (int i = 0; i < sCachedCVCList.size(); i++) {
+            initializeContentViewCore(sCachedCVCList.get(i));
+        }
+        sCachedCVCList.clear();
+
+        sCachedViewList.clear();
+        tab.getAllViews(sCachedViewList);
+
+        for (int i = 0; i < sCachedViewList.size(); i++) {
+            View view = sCachedViewList.get(i);
+            // Calling View#measure() and View#layout() on a View before adding it to the view
+            // hierarchy seems to cause issues with compound drawables on some versions of Android.
+            // We don't need to proactively size the NTP as we don't need the Android view to render
+            // if it's not actually attached to the view hierarchy (http://crbug.com/462114).
+            if (view == tab.getView() && tab.isNativePage()) continue;
+            setSizeOfUnattachedView(view);
+        }
+        sCachedViewList.clear();
+    }
+
+    /**
+     * Initializes the rendering surface parameters of {@code contentViewCore}.  Note that this does
+     * not size the actual {@link ContentViewCore}.
+     * @param contentViewCore The {@link ContentViewCore} to initialize.
+     */
+    private void initializeContentViewCore(ContentViewCore contentViewCore) {
+        contentViewCore.setCurrentMotionEventOffsets(0.f, 0.f);
+        contentViewCore.setTopControlsHeight(
+                getTopControlsHeightPixels(), contentViewCore.doTopControlsShrinkBlinkSize());
+        contentViewCore.onPhysicalBackingSizeChanged(
+                mCompositorView.getWidth(), mCompositorView.getHeight());
+        contentViewCore.onOverdrawBottomHeightChanged(mCompositorView.getOverdrawBottomHeight());
+    }
+
+    /**
+     * Resize {@code view} to match the size of this {@link FrameLayout}.  This will only happen if
+     * {@code view} is not {@code null} and if {@link View#getWindowToken()} returns {@code null}
+     * (the {@link View} is not part of the view hierarchy).
+     * @param view The {@link View} to resize.
+     * @return     Whether or not {@code view} was resized.
+     */
+    private boolean setSizeOfUnattachedView(View view) {
+        // Need to call layout() for the following View if it is not attached to the view hierarchy.
+        // Calling onSizeChanged() is dangerous because if the View has a different size than the
+        // ContentViewCore it might think a future size update is a NOOP and not call
+        // onSizeChanged() on the ContentViewCore.
+        if (view == null || view.getWindowToken() != null) return false;
+        int width = getWidth();
+        int height = getHeight();
+        view.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
+                MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
+        view.layout(0, 0, width, height);
+        return true;
+    }
+
+    @Override
+    public TitleCache getTitleCache() {
+        return mLayerTitleCache;
+    }
+
+    @Override
+    public void deferInvalidate(Client client) {
+        if (mPendingSwapBuffersCount <= 0) {
+            client.doInvalidate();
+        } else if (!mPendingInvalidations.contains(client)) {
+            mPendingInvalidations.add(client);
+        }
+    }
+
+    private void flushInvalidation() {
+        if (mPendingInvalidations.isEmpty()) return;
+        TraceEvent.instant("CompositorViewHolder.flushInvalidation");
+        for (int i = 0; i < mPendingInvalidations.size(); i++) {
+            mPendingInvalidations.get(i).doInvalidate();
+        }
+        mPendingInvalidations.clear();
+    }
+
+    @Override
+    public void invalidateAccessibilityProvider() {
+        if (mNodeProvider != null) {
+            mNodeProvider.invalidateRoot();
+        }
+    }
+
+    /**
+     * Called when the accessibility enabled state changes.
+     * @param enabled Whether accessibility is enabled.
+     */
+    public void onAccessibilityStatusChanged(boolean enabled) {
+        // Instantiate and install the accessibility node provider on this view if necessary.
+        // This overrides any hover event listeners or accessibility delegates
+        // that may have been added elsewhere.
+        if (enabled && (mNodeProvider == null)) {
+            mAccessibilityView = new View(getContext());
+            addView(mAccessibilityView);
+            mNodeProvider = new CompositorAccessibilityProvider(mAccessibilityView);
+            ViewCompat.setAccessibilityDelegate(mAccessibilityView, mNodeProvider);
+        }
+    }
+
+    /**
+     * Class used to provide a virtual view hierarchy to the Accessibility
+     * framework for this view and its contained items.
+     * <p>
+     * <strong>NOTE:</strong> This class is fully backwards compatible for
+     * compilation, but will only provide touch exploration on devices running
+     * Ice Cream Sandwich and above.
+     * </p>
+     */
+    private class CompositorAccessibilityProvider extends ExploreByTouchHelper {
+        private final float mDpToPx;
+        List<VirtualView> mVirtualViews = new ArrayList<VirtualView>();
+        private final Rect mPlaceHolderRect = new Rect(0, 0, 1, 1);
+        private static final String PLACE_HOLDER_STRING = "";
+        private final RectF mTouchTarget = new RectF();
+        private final Rect mPixelRect = new Rect();
+
+        public CompositorAccessibilityProvider(View forView) {
+            super(forView);
+            mDpToPx = getContext().getResources().getDisplayMetrics().density;
+        }
+
+        @Override
+        protected int getVirtualViewAt(float x, float y) {
+            if (mVirtualViews == null) return INVALID_ID;
+            for (int i = 0; i < mVirtualViews.size(); i++) {
+                if (mVirtualViews.get(i).checkClicked(x / mDpToPx, y / mDpToPx)) {
+                    return i;
+                }
+            }
+            return INVALID_ID;
+        }
+
+        @Override
+        protected void getVisibleVirtualViews(List<Integer> virtualViewIds) {
+            if (mLayoutManager == null) return;
+            mVirtualViews.clear();
+            mLayoutManager.getVirtualViews(mVirtualViews);
+            for (int i = 0; i < mVirtualViews.size(); i++) {
+                virtualViewIds.add(i);
+            }
+        }
+
+        @Override
+        protected boolean onPerformActionForVirtualView(
+                int virtualViewId, int action, Bundle arguments) {
+            switch (action) {
+                case AccessibilityNodeInfoCompat.ACTION_CLICK:
+                    return true;
+            }
+
+            return false;
+        }
+
+        @Override
+        protected void onPopulateEventForVirtualView(int virtualViewId, AccessibilityEvent event) {
+            if (mVirtualViews == null || mVirtualViews.size() <= virtualViewId) {
+                // TODO(clholgat): Remove this work around when the Android bug is fixed.
+                // crbug.com/420177
+                event.setContentDescription(PLACE_HOLDER_STRING);
+                return;
+            }
+            VirtualView view = mVirtualViews.get(virtualViewId);
+
+            event.setContentDescription(view.getAccessibilityDescription());
+            event.setClassName(CompositorViewHolder.class.getName());
+        }
+
+        @Override
+        protected void onPopulateNodeForVirtualView(
+                int virtualViewId, AccessibilityNodeInfoCompat node) {
+            if (mVirtualViews == null || mVirtualViews.size() <= virtualViewId) {
+                // TODO(clholgat): Remove this work around when the Android bug is fixed.
+                // crbug.com/420177
+                node.setBoundsInParent(mPlaceHolderRect);
+                node.setContentDescription(PLACE_HOLDER_STRING);
+                return;
+            }
+            VirtualView view = mVirtualViews.get(virtualViewId);
+            view.getTouchTarget(mTouchTarget);
+
+            node.setBoundsInParent(rectToPx(mTouchTarget));
+            node.setContentDescription(view.getAccessibilityDescription());
+            node.addAction(AccessibilityNodeInfoCompat.ACTION_CLICK);
+            node.addAction(AccessibilityNodeInfoCompat.ACTION_FOCUS);
+            node.addAction(AccessibilityNodeInfoCompat.ACTION_LONG_CLICK);
+        }
+
+        private Rect rectToPx(RectF rect) {
+            rect.roundOut(mPixelRect);
+            mPixelRect.left = (int) (mPixelRect.left * mDpToPx);
+            mPixelRect.top = (int) (mPixelRect.top * mDpToPx);
+            mPixelRect.right = (int) (mPixelRect.right * mDpToPx);
+            mPixelRect.bottom = (int) (mPixelRect.bottom * mDpToPx);
+
+            // Don't let any zero sized rects through, they'll cause parent
+            // size errors in L.
+            if (mPixelRect.width() == 0) {
+                mPixelRect.right = mPixelRect.left + 1;
+            }
+            if (mPixelRect.height() == 0) {
+                mPixelRect.bottom = mPixelRect.top + 1;
+            }
+            return mPixelRect;
+        }
+    }
+}