Integrate new Reader Mode panel

chrome/android/java/src/org/chromium/chrome/browser/dom_distiller/ReaderModePanel.java

Index: chrome/android/java/src/org/chromium/chrome/browser/dom_distiller/ReaderModePanel.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/dom_distiller/ReaderModePanel.java b/chrome/android/java/src/org/chromium/chrome/browser/dom_distiller/ReaderModePanel.java
deleted file mode 100644
index 0b892fcb90780fcdcc827a96ae34b27680c62fc6..0000000000000000000000000000000000000000
--- a/chrome/android/java/src/org/chromium/chrome/browser/dom_distiller/ReaderModePanel.java
+++ /dev/null
@@ -1,877 +0,0 @@
-// 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.dom_distiller;
-
-import static org.chromium.chrome.browser.compositor.layouts.ChromeAnimation.AnimatableAnimation.createAnimation;
-
-import android.content.Context;
-import android.os.SystemClock;
-
-import org.chromium.base.CommandLine;
-import org.chromium.base.metrics.RecordHistogram;
-import org.chromium.base.metrics.RecordUserAction;
-import org.chromium.chrome.browser.ChromeSwitches;
-import org.chromium.chrome.browser.WebContentsFactory;
-import org.chromium.chrome.browser.compositor.layouts.ChromeAnimation;
-import org.chromium.chrome.browser.compositor.layouts.ChromeAnimation.Animatable;
-import org.chromium.chrome.browser.compositor.layouts.eventfilter.EdgeSwipeEventFilter.ScrollDirection;
-import org.chromium.chrome.browser.compositor.scene_layer.ReaderModeSceneLayer;
-import org.chromium.chrome.browser.compositor.scene_layer.SceneLayer;
-import org.chromium.chrome.browser.dom_distiller.ReaderModeButtonView.ReaderModeButtonViewDelegate;
-import org.chromium.chrome.browser.tab.EmptyTabObserver;
-import org.chromium.chrome.browser.tab.Tab;
-import org.chromium.chrome.browser.util.MathUtils;
-import org.chromium.content.browser.ContentView;
-import org.chromium.content.browser.ContentViewClient;
-import org.chromium.content.browser.ContentViewCore;
-import org.chromium.content_public.browser.NavigationController;
-import org.chromium.content_public.browser.WebContents;
-import org.chromium.content_public.browser.WebContentsObserver;
-import org.chromium.ui.base.WindowAndroid;
-import org.chromium.ui.resources.ResourceManager;
-
-import java.util.concurrent.TimeUnit;
-
-/**
- * Manages UI effects for reader mode including hiding and showing the
- * reader mode and reader mode preferences toolbar icon and hiding the
- * top controls when a reader mode page has finished loading.
- *
- * TODO(aruslan): combine with ContextualSearchPanel.
- */
-public class ReaderModePanel implements ChromeAnimation.Animatable<ReaderModePanel.Property> {
-    // TODO(aruslan): pull this from the FullscreenManager.
-    private static final float TOOLBAR_HEIGHT_DP = 56.0f;
-
-    private static final float PANEL_HEIGHT_DP = TOOLBAR_HEIGHT_DP;
-    private static final float SHADOW_HEIGHT_DP = 4.0f;
-    private static final float MINIMAL_BORDER_X_DP = 4.0f;
-    private static final float DARKEN_LAYOUTTAB_BRIGHTNESS = 0.3f;
-    private static final float MAX_LAYOUTTAB_DISPLACEMENT = 3.0f * TOOLBAR_HEIGHT_DP;
-
-    private static final float SNAP_BACK_THRESHOLD = 0.3f;
-    private static final long BASE_ANIMATION_DURATION_MS = 500;
-
-    /**
-     * Panel's host interface.
-     */
-    public interface ReaderModePanelHost {
-        /**
-         * @return Reader mode header background color.
-         */
-        int getReaderModeHeaderBackgroundColor();
-
-        /**
-         * @return One of ReaderModeManager.POSSIBLE, NOT_POSSIBLE, STARTED constants.
-         */
-        int getReaderModeStatus();
-
-        /**
-         * @return An associated tab.
-         */
-        Tab getTab();
-
-        /**
-         * @param X X-coordinate in dp
-         * @param Y Y-coordinate in dp
-         * @return Whether a given coordinates are within the bounds of the "dismiss" button
-         */
-        boolean isInsideDismissButton(float x, float y);
-
-        /**
-         * Creates the Reader Mode control if necessary.
-         */
-        void createReaderModeControl();
-
-        /**
-         * Destroys the Reader Mode control.
-         */
-        void destroyReaderModeControl();
-    }
-
-    /**
-     * Layout integration interface.
-     */
-    public interface ReaderModePanelLayoutDelegate {
-        /**
-         * Requests a next update to refresh the transforms and changing properties.
-         */
-        void requestUpdate();
-
-        /**
-         * Sets the brightness of the LayoutTab to a given value.
-         * @param v Brightness
-         */
-        void setLayoutTabBrightness(float v);
-
-        /**
-         * Sets the Y offset of the LayoutTab to a given value.
-         * @param v Y-offset in dp
-         */
-        void setLayoutTabY(float v);
-    }
-
-    /**
-     * Properties that can be animated by using a
-     * {@link org.chromium.chrome.browser.compositor.layouts.ChromeAnimation.Animatable}.
-     */
-    public enum Property {
-        /**
-         * Parametric vertical slider from
-         * -1.0 (panel is out of screen) to
-         * 0.0 (panel is on screen) to
-         * 1.0 (panel covers the entire screen)
-         */
-        SLIDING_T,
-        /**
-         * Horizontal slider, offset in dp
-         */
-        X,
-    }
-
-    private float mSlidingT;
-    private float mX;
-
-    private ScrollDirection mSwipeDirection;  // set in swipeStarted
-    private float mInitialPanelDistanceFromBottom;  // distance from the bottom at swipeStarted
-    private float mInitialX;  // X at swipeStarted
-
-    /**
-     * The animation set.
-     */
-    private ChromeAnimation<ChromeAnimation.Animatable<?>> mLayoutAnimations;
-
-    private boolean mIsReaderModePanelHidden;
-    private boolean mIsReaderModePanelDismissed;
-    private boolean mIsFullscreenModeEntered;
-    private boolean mIsInfobarContainerShown;
-
-    private ContentViewCore mDistilledContentViewCore;
-    private boolean mDidStartLoad;
-    private boolean mDidFinishLoad;
-    private WebContentsObserver mDistilledContentObserver;
-    private boolean mDidFirstNonEmptyDistilledPaint;
-    private ReaderModePanelLayoutDelegate mLayoutDelegate;
-    private WebContents mOriginalWebContent;
-
-    private float mLayoutWidth;
-    private float mLayoutHeight;
-    private boolean mIsToolbarShowing;
-    private float mDpToPx;
-
-    /**
-     * ContentViewClient state to override when the distilled ContentViewCore is set on the Tab.
-     */
-    private float mTopControlsOffsetYPix;
-    private float mContentOffsetYPix;
-    private float mOverdrawBottomHeightPix;
-
-    /**
-     * The {@link ReaderModePanelHost} used to get reader mode status and the associated tab.
-     */
-    private final ReaderModePanelHost mReaderModeHost;
-
-    /**
-     * The SceneLayer responsible for drawing the panel.
-     */
-    private ReaderModeSceneLayer mSceneLayer;
-
-    /**
-     * Non-animated button support.
-     */
-    private boolean mAllowAnimatedButton;
-    private ReaderModeButtonView mReaderModeButtonView;
-
-    public ReaderModePanel(ReaderModePanelHost readerModeHost, Context context) {
-        mReaderModeHost = readerModeHost;
-
-        // Make sure all WebContents are destroyed when a tab is closed: crbug.com/496653
-        mReaderModeHost.getTab().addObserver(new EmptyTabObserver() {
-            @Override
-            public void onDestroyed(Tab tab) {
-                destroyCachedOriginalWebContent();
-                destroyDistilledContentViewCore();
-            }
-        });
-
-        mAllowAnimatedButton = CommandLine.getInstance().hasSwitch(
-                ChromeSwitches.ENABLE_READER_MODE_BUTTON_ANIMATION);
-
-        mLayoutWidth = 0.0f;
-        mLayoutHeight = 0.0f;
-        mDpToPx = 1.0f;
-
-        mSlidingT = -1.0f;
-        mX = 0.0f;
-
-        float dpToPx = context.getResources().getDisplayMetrics().density;
-        mSceneLayer = new ReaderModeSceneLayer(dpToPx);
-    }
-
-    /**
-     * Get this panel's SceneLayer.
-     * NOTE(mdjones): This overrides a method in OverlayPanel once the refactor is complete.
-     */
-    public SceneLayer getSceneLayer() {
-        return mSceneLayer;
-    }
-
-    /**
-     * Update this panel's SceneLayer.
-     * NOTE(mdjones): This overrides a method in OverlayPanel once the refactor is complete.
-     * @param resourceManager Resource manager for static resources.
-     */
-    public void updateSceneLayer(ResourceManager resourceManager) {
-        mSceneLayer.update(this, resourceManager);
-    }
-
-    /**
-     * Destroys the panel and associated resources.
-     */
-    public void onDestroy() {
-        hideButtonBar();
-    }
-
-    /**
-     * Set the layout delegate.
-     * @param layoutDelegate A {@link ReaderModePanelLayoutDelegate} to call.
-     */
-    public void setLayoutDelegate(ReaderModePanelLayoutDelegate layoutDelegate) {
-        mLayoutDelegate = layoutDelegate;
-        requestUpdate();
-    }
-
-    // ChromeAnimation.Animatable<Property>:
-
-    private void setSlidingT(float val) {
-        mSlidingT = val;
-        if (mLayoutDelegate != null) {
-            mLayoutDelegate.setLayoutTabBrightness(getTabBrightness());
-            mLayoutDelegate.setLayoutTabY(getTabYOffset());
-        }
-    }
-
-    @Override
-    public void setProperty(Property prop, float val) {
-        switch (prop) {
-            case SLIDING_T:
-                setSlidingT(val);
-                break;
-            case X:
-                mX = val;
-                break;
-        }
-    }
-
-    private static float clamp(float val, float lower, float higher) {
-        return val < lower ? lower : (val > higher ? higher : val);
-    }
-
-    private static float interp(float factor, float start, float end) {
-        return start + clamp(factor, 0.0f, 1.0f) * (end - start);
-    }
-
-    private float getPanelDistanceFromBottom() {
-        if (mSlidingT < 0.0f) return interp(mSlidingT + 1.0f, 0.0f, PANEL_HEIGHT_DP);
-        return PANEL_HEIGHT_DP + interp(mSlidingT, 0.0f, getFullscreenHeight());
-    }
-
-    private float getSlidingTForPanelDistanceFromBottom(float distanceFromBottom) {
-        if (distanceFromBottom >= PANEL_HEIGHT_DP) {
-            return interp(
-                    (distanceFromBottom - PANEL_HEIGHT_DP) / getFullscreenHeight(),
-                    0.0f, 1.0f);
-        }
-        return interp(
-                (PANEL_HEIGHT_DP - distanceFromBottom) / PANEL_HEIGHT_DP,
-                0.0f, -1.0f);
-    }
-
-    private float getDistilledContentDistanceFromBottom() {
-        if (mSlidingT < 0.0f) return interp(mSlidingT + 1.0f, -PANEL_HEIGHT_DP, 0.0f);
-        return interp(mSlidingT, 0.0f, getFullscreenHeight());
-    }
-
-    private static float snapBackSlidingT(float v) {
-        // We snap asymmetrically: 30% is enough to get it opened, but 70% is necessary to dismiss.
-        v = (v < -1.0f + SNAP_BACK_THRESHOLD) ? v : (v >= SNAP_BACK_THRESHOLD ? v : 0.0f);
-        return Math.signum(v);
-    }
-
-    private static float snapBackX(float v) {
-        // Horizontally we snap symmetrically: more than 70% to each side to dismiss.
-        v = (v < -1.0f + SNAP_BACK_THRESHOLD) ? v : (v >= 1.0f - SNAP_BACK_THRESHOLD ? v : 0.0f);
-        return Math.signum(v);
-    }
-
-    // Gesture handling:
-
-    /**
-     * @param direction Swipe direction to test
-     * @return Whether the swipe in a given direction is enabled
-     */
-    public boolean isSwipeEnabled(ScrollDirection direction) {
-        return !isAnimating();
-    }
-
-    /**
-     * Called when the swipe is started.
-     * @param direction Swipe direction
-     * @param x X-coordinate of the starting point in dp
-     * @param y Y-coordinate of the starting point in dp
-     */
-    public void swipeStarted(ScrollDirection direction, float x, float y) {
-        if (isAnimating()) return;
-
-        mSwipeDirection = direction;
-        mInitialPanelDistanceFromBottom = getPanelDistanceFromBottom();
-        mX = getX();
-
-        if (mSwipeDirection == ScrollDirection.UP) activatePreviewOfDistilledMode();
-
-        requestUpdate();
-    }
-
-    /**
-     * Called when the swipe is continued.
-     * @param tx X-offset since the start of the swipe in dp
-     * @param ty Y-offset since the start of the swipe in dp
-     */
-    public void swipeUpdated(float x, float y, float dx, float dy, float tx, float ty) {
-        if (isAnimating()) return;
-
-        if (mSwipeDirection == ScrollDirection.LEFT || mSwipeDirection == ScrollDirection.RIGHT) {
-            setProperty(ReaderModePanel.Property.X, clamp(mInitialX + tx,
-                    -mLayoutWidth + MINIMAL_BORDER_X_DP, mLayoutWidth - MINIMAL_BORDER_X_DP));
-        } else {
-            setProperty(ReaderModePanel.Property.SLIDING_T,
-                    getSlidingTForPanelDistanceFromBottom(mInitialPanelDistanceFromBottom - ty));
-        }
-        requestUpdate();
-    }
-
-    /**
-     * Called when the swipe is finished.
-     */
-    public void swipeFinished() {
-        if (isAnimating()) return;
-
-        final float snappedX = snapBackX(mX / mLayoutWidth) * mLayoutWidth;
-        final float snappedSlidingT = snapBackSlidingT(mSlidingT);
-        if (snappedX <= -mLayoutWidth || snappedX >= mLayoutWidth) dismissButtonBar();
-        if (snappedSlidingT < 0.0f) dismissButtonBar();
-
-        animateTo(snappedX, snappedSlidingT, true);
-    }
-
-    // Panel layout handling:
-
-    /**
-     * @return Whether the panel should be shown.
-     */
-    public boolean isShowing() {
-        return isPanelWithinScreenBounds() || isAnimating() || mDistilledContentViewCore != null;
-    }
-
-    /**
-     * @return Whether the panel is within screen bounds.
-     */
-    private boolean isPanelWithinScreenBounds() {
-        return mSlidingT > -1.0f;
-    }
-
-    /**
-     * @return The fullscreen height.
-     */
-    private float getFullscreenHeight() {
-        return mLayoutHeight + TOOLBAR_HEIGHT_DP;
-    }
-
-    public float getFullscreenY(float y) {
-        if (mIsToolbarShowing) y += TOOLBAR_HEIGHT_DP * mDpToPx;
-        return y;
-    }
-
-    public float getPanelY() {
-        return getFullscreenHeight() - getPanelDistanceFromBottom() - SHADOW_HEIGHT_DP;
-    }
-
-    public float getDistilledContentY() {
-        return getFullscreenHeight() - getDistilledContentDistanceFromBottom() - SHADOW_HEIGHT_DP;
-    }
-
-    public float getWidth() {
-        return mLayoutWidth;
-    }
-
-    public float getPanelHeight() {
-        return getPanelDistanceFromBottom();
-    }
-
-    public float getMarginTop() {
-        return SHADOW_HEIGHT_DP;
-    }
-
-    public float getDistilledHeight() {
-        return getDistilledContentDistanceFromBottom();
-    }
-
-    public float getX() {
-        return mX;
-    }
-
-    public float getTextOpacity() {
-        return interp(mSlidingT, 1.0f, 0.0f);
-    }
-
-    public float getTabBrightness() {
-        return interp(mSlidingT, 1.0f, DARKEN_LAYOUTTAB_BRIGHTNESS);
-    }
-
-    public float getTabYOffset() {
-        return interp(mSlidingT, 0.0f, -MAX_LAYOUTTAB_DISPLACEMENT);
-    }
-
-    /**
-     * @param currentOffset The current top controls offset in dp.
-     * @return {@link Float#NaN} if no offset should be used, or a value in dp
-     *         if the top controls offset should be overridden.
-     */
-    public float getTopControlsOffset(float currentOffsetDp) {
-        if (mSlidingT <= 0.0f) return Float.NaN;
-        return MathUtils.clamp(getTabYOffset(), -TOOLBAR_HEIGHT_DP, Math.min(currentOffsetDp, 0f));
-    }
-
-
-    public ContentViewCore getDistilledContentViewCore() {
-        return mDistilledContentViewCore;
-    }
-
-    public boolean didFirstNonEmptyDistilledPaint() {
-        return mDidFirstNonEmptyDistilledPaint;
-    }
-
-    public int getReaderModeHeaderBackgroundColor() {
-        return mReaderModeHost.getReaderModeHeaderBackgroundColor();
-    }
-
-    /**
-     * Called when the size of the view has changed.
-     *
-     * @param width  The new width in dp.
-     * @param height The new width in dp.
-     * @param isToolbarShowing Whether the Toolbar is showing.
-     * @param dpToPx Multipler to convert from dp to pixels.
-     */
-    public void onSizeChanged(float width, float height, boolean isToolbarShowing, float dpToPx) {
-        mLayoutWidth = width;
-        mLayoutHeight = height;
-        mIsToolbarShowing = isToolbarShowing;
-        mDpToPx = dpToPx;
-    }
-
-    // Layout integration:
-
-    /**
-     * Requests a new frame to be updated and rendered.
-     */
-    private void requestUpdate() {
-        if (mLayoutDelegate != null) mLayoutDelegate.requestUpdate();
-    }
-
-    // Animation handling:
-
-    /**
-     * @return Whether a panel animation is in progress.
-     */
-    private boolean isAnimating() {
-        return mLayoutAnimations != null && !mLayoutAnimations.finished();
-    }
-
-    /**
-     * Animates to a given target value.
-     * @param targetX A target value for the X parameter
-     * @param targetSlidingT A target value for the SlidingT parameter
-     */
-    private void animateTo(float targetX, float targetSlidingT, boolean animate) {
-        if (targetSlidingT > 0.0f) activatePreviewOfDistilledMode();
-
-        if (isAnimating()) {
-            mLayoutAnimations.cancel(this, Property.SLIDING_T);
-            mLayoutAnimations.cancel(this, Property.X);
-        }
-        if (mLayoutAnimations == null || mLayoutAnimations.finished()) {
-            mLayoutAnimations = new ChromeAnimation<Animatable<?>>();
-        }
-
-        mLayoutAnimations.add(createAnimation(
-                this, Property.SLIDING_T, mSlidingT, targetSlidingT,
-                BASE_ANIMATION_DURATION_MS, 0, false,
-                ChromeAnimation.getDecelerateInterpolator()));
-        mLayoutAnimations.add(createAnimation(
-                this, Property.X, mX, targetX,
-                BASE_ANIMATION_DURATION_MS, 0, false,
-                ChromeAnimation.getDecelerateInterpolator()));
-        mLayoutAnimations.start();
-
-        if (!animate) mLayoutAnimations.updateAndFinish();
-        requestUpdate();
-    }
-
-    /**
-     * Steps the animation forward and updates all the animated values.
-     * @param time      The current time of the app in ms.
-     * @param jumpToEnd Whether to finish the animation.
-     * @return          Whether the animation was finished.
-     */
-    public boolean onUpdateAnimation(long time, boolean jumpToEnd) {
-        boolean finished = true;
-        if (mLayoutAnimations != null) {
-            if (jumpToEnd) {
-                finished = mLayoutAnimations.finished();
-                mLayoutAnimations.updateAndFinish();
-            } else {
-                finished = mLayoutAnimations.update(time);
-            }
-
-            if (finished || jumpToEnd) {
-                mLayoutAnimations = null;
-                onAnimationFinished();
-            }
-            requestUpdate();
-        }
-        return finished;
-    }
-
-    /**
-     * Called when layout-specific actions are needed after the animation finishes.
-     */
-    private void onAnimationFinished() {
-        if (mSlidingT >= 1.0f) enterDistilledMode();
-        updateBottomButtonBar();
-    }
-
-    // Gesture handling:
-
-    /**
-     * @param y The y coordinate in dp.
-     * @return Whether the given |y| coordinate is inside the Reader mode area.
-     */
-    public boolean isYCoordinateInsideReaderModePanel(float y) {
-        return y >= getPanelY() || y >= getDistilledContentY();
-    }
-
-    /**
-     * Handles a click in the panel area.
-     * @param x X-coordinate in dp
-     * @param y Y-coordinate in dp
-     */
-    public void handleClick(long time, float x, float y) {
-        if (mReaderModeHost.isInsideDismissButton(x * mDpToPx + mX, PANEL_HEIGHT_DP / 2)) {
-            dismissButtonBar();
-            return;
-        }
-
-        animateTo(mX, 1.0f, true);
-    }
-
-    /**
-     * @return Whether the reader mode could be currently allowed.
-     */
-    public boolean isReaderModeCurrentlyAllowed() {
-        return !mIsReaderModePanelHidden && !mIsReaderModePanelDismissed
-                && !mIsFullscreenModeEntered && !mIsInfobarContainerShown
-                && mReaderModeHost.getTab() != null
-                && mReaderModeHost.getTab().getContentViewCore() != null
-                && mReaderModeHost.getTab().getContentViewCore().getContext() != null
-                && mReaderModeHost.getTab().getWebContents() != null;
-    }
-
-    private void nonAnimatedUpdateButtomButtonBar() {
-        final int status = mReaderModeHost.getReaderModeStatus();
-        final Tab tab = mReaderModeHost.getTab();
-
-        if (mReaderModeButtonView != null
-                && (status != ReaderModeManager.POSSIBLE || !isReaderModeCurrentlyAllowed())) {
-            // Unfortunately, dismiss() couldn't be used because it might attempt to remove a view
-            // while in onLayout, thus causing crash.
-            final ReaderModeButtonView buttonView = mReaderModeButtonView;
-            mReaderModeButtonView.post(new Runnable() {
-                @Override
-                public void run() {
-                    // Unfortunately, dismiss() couldn't be used because it might attempt
-                    // to remove a view while in onLayout, thus causing crash.
-                    buttonView.removeFromParentView();
-                }
-            });
-            mReaderModeButtonView = null;
-            return;
-        }
-
-        if (mReaderModeButtonView == null
-                && (status == ReaderModeManager.POSSIBLE && isReaderModeCurrentlyAllowed())) {
-            mReaderModeButtonView = ReaderModeButtonView.create(tab.getContentViewCore(),
-                    new ReaderModeButtonViewDelegate() {
-                        @Override
-                        public void onSwipeAway() {
-                            dismissButtonBar();
-                        }
-
-                        @Override
-                        public void onClick() {
-                            nonAnimatedEnterDistilledMode();
-                        }
-                    });
-        }
-    }
-
-    /**
-     * Updates the visibility of the reader mode button bar as required.
-     */
-    public void updateBottomButtonBar() {
-        if (!mAllowAnimatedButton) {
-            nonAnimatedUpdateButtomButtonBar();
-            return;
-        }
-
-        if (isAnimating()) {
-            mReaderModeHost.createReaderModeControl();
-            return;
-        }
-
-        final int status = mReaderModeHost.getReaderModeStatus();
-        if (isPanelWithinScreenBounds()
-                && (status != ReaderModeManager.POSSIBLE || !isReaderModeCurrentlyAllowed())) {
-            animateTo(0.0f, -1.0f, true);
-            mReaderModeHost.destroyReaderModeControl();
-            destroyCachedOriginalWebContent();
-            destroyDistilledContentViewCore();
-            requestUpdate();
-            return;
-        }
-
-        if (!isPanelWithinScreenBounds()
-                && (status == ReaderModeManager.POSSIBLE && isReaderModeCurrentlyAllowed())) {
-            animateTo(0.0f, 0.0f, true);
-            mReaderModeHost.createReaderModeControl();
-            requestUpdate();
-            return;
-        }
-    }
-
-    private ContentViewCore createDistillerContentViewCore(
-            Context context, WindowAndroid windowAndroid) {
-        boolean isHostTabIncognito =
-                mReaderModeHost.getTab().getContentViewCore().getWebContents().isIncognito();
-        ContentViewCore cvc = new ContentViewCore(context);
-        ContentView cv = ContentView.createContentView(context, cvc);
-        cvc.initialize(cv, cv, WebContentsFactory.createWebContents(isHostTabIncognito, true),
-                windowAndroid);
-        cvc.setContentViewClient(new ContentViewClient() {
-            @Override
-            public void onOffsetsForFullscreenChanged(float topControlsOffsetYPix,
-                    float contentOffsetYPix, float overdrawBottomHeightPix) {
-                super.onOffsetsForFullscreenChanged(topControlsOffsetYPix, contentOffsetYPix,
-                        overdrawBottomHeightPix);
-                mTopControlsOffsetYPix = topControlsOffsetYPix;
-                mContentOffsetYPix = contentOffsetYPix;
-                mOverdrawBottomHeightPix = overdrawBottomHeightPix;
-            }
-        });
-        return cvc;
-    }
-
-    /**
-     * Prepares the distilled mode.
-     */
-    public void activatePreviewOfDistilledMode() {
-        final long start = SystemClock.elapsedRealtime();
-
-        if (mDistilledContentViewCore != null) return;
-
-        mDidFirstNonEmptyDistilledPaint = false;
-        mDidStartLoad = false;
-        mDidFinishLoad = false;
-
-        destroyCachedOriginalWebContent();
-        mDistilledContentViewCore = createDistillerContentViewCore(
-                mReaderModeHost.getTab().getContentViewCore().getContext(),
-                mReaderModeHost.getTab().getWindowAndroid());
-
-        mergeNavigationHistory(mDistilledContentViewCore.getWebContents(),
-                mReaderModeHost.getTab().getWebContents());
-
-        mDistilledContentObserver = new WebContentsObserver(
-                mDistilledContentViewCore.getWebContents()) {
-            @Override
-            public void didFirstVisuallyNonEmptyPaint() {
-                super.didFirstVisuallyNonEmptyPaint();
-                mDidFirstNonEmptyDistilledPaint = true;
-
-                RecordHistogram.recordTimesHistogram("DomDistiller.Time.SwipeToPaint",
-                        SystemClock.elapsedRealtime() - start, TimeUnit.MILLISECONDS);
-            }
-
-            @Override
-            public void didStartLoading(String url) {
-                super.didStartLoading(url);
-                mDidStartLoad = true;
-            }
-
-            @Override
-            public void didFinishLoad(long frameId, String validatedUrl, boolean isMainFrame) {
-                super.didFinishLoad(frameId, validatedUrl, isMainFrame);
-                if (isMainFrame) mDidFinishLoad = true;
-            }
-        };
-        mReaderModeHost.getTab().attachOverlayContentViewCore(
-                mDistilledContentViewCore, true, false);
-        DomDistillerTabUtils.distillAndView(
-                mReaderModeHost.getTab().getContentViewCore().getWebContents(),
-                mDistilledContentViewCore.getWebContents());
-        mDistilledContentViewCore.onShow();
-    }
-
-    private void nonAnimatedEnterDistilledMode() {
-        RecordUserAction.record("DomDistiller_DistilledPageOpened");
-        DomDistillerTabUtils.distillCurrentPageAndView(mReaderModeHost.getTab().getWebContents());
-        nonAnimatedUpdateButtomButtonBar();
-    }
-
-    private static void mergeNavigationHistory(WebContents target, WebContents source) {
-        target.getNavigationController().clearHistory();
-        NavigationController distilled = target.getNavigationController();
-        NavigationController original = source.getNavigationController();
-        if (distilled.canPruneAllButLastCommitted()) {
-            distilled.copyStateFromAndPrune(original, false);
-        } else if (distilled.canCopyStateOver()) {
-            distilled.copyStateFrom(original);
-        }
-    }
-
-    private void enterDistilledMode() {
-        if (!isReaderModeCurrentlyAllowed()) return;
-
-        RecordUserAction.record("DomDistiller_DistilledPageOpened");
-        mSlidingT = -1.0f;
-        requestUpdate();
-
-        mDistilledContentViewCore.getWebContents().updateTopControlsState(true, false, false);
-
-        mReaderModeHost.getTab().detachOverlayContentViewCore(mDistilledContentViewCore);
-        mDistilledContentObserver.destroy();
-        mDistilledContentObserver = null;
-
-        mOriginalWebContent = mReaderModeHost.getTab().getWebContents();
-
-        mDistilledContentViewCore.setContentViewClient(new ContentViewClient());
-        mReaderModeHost.getTab().swapContentViewCore(mDistilledContentViewCore, false,
-                mDidStartLoad, mDidFinishLoad);
-        mDistilledContentViewCore.getContentViewClient().onOffsetsForFullscreenChanged(
-                mTopControlsOffsetYPix, mContentOffsetYPix, mOverdrawBottomHeightPix);
-
-        mDistilledContentViewCore = null;
-        destroyDistilledContentViewCore();
-
-        if (mLayoutDelegate != null) {
-            mLayoutDelegate.setLayoutTabBrightness(1.0f);
-            mLayoutDelegate.setLayoutTabY(0.0f);
-        }
-
-        updateBottomButtonBar();
-    }
-
-    private void destroyCachedOriginalWebContent() {
-        if (mOriginalWebContent != null) {
-            mOriginalWebContent.destroy();
-            mOriginalWebContent = null;
-        }
-    }
-
-    private void destroyDistilledContentViewCore() {
-        if (mDistilledContentObserver != null) {
-            mDistilledContentObserver.destroy();
-            mDistilledContentObserver = null;
-        }
-
-        if (mDistilledContentViewCore == null) return;
-
-        mReaderModeHost.getTab().detachOverlayContentViewCore(mDistilledContentViewCore);
-
-        mDistilledContentViewCore.getWebContents().destroy();
-        mDistilledContentViewCore.destroy();
-        mDistilledContentViewCore = null;
-    }
-
-    /**
-     * Hides the reader mode button bar if shown.
-     */
-    public void hideButtonBar() {
-        mIsReaderModePanelHidden = true;
-        mLayoutAnimations = null;
-        updateBottomButtonBar();
-    }
-
-    /**
-     * Dismisses the reader mode button bar if shown.
-     */
-    public void dismissButtonBar() {
-        mIsReaderModePanelDismissed = true;
-        mLayoutAnimations = null;
-        updateBottomButtonBar();
-    }
-
-    /**
-     * Shows the reader mode button bar if necessary.
-     */
-    public void unhideButtonBar() {
-        mIsReaderModePanelHidden = false;
-        updateBottomButtonBar();
-    }
-
-    /**
-     * Temporarily hides the reader mode button while the video is shown.
-     */
-    public void onEnterFullscreen() {
-        mIsFullscreenModeEntered = true;
-        mLayoutAnimations = null;
-        updateBottomButtonBar();
-    }
-
-    /**
-     * Re-shows the reader mode button if necessary once the video is exited.
-     */
-    public void onExitFullscreen() {
-        mIsFullscreenModeEntered = false;
-        updateBottomButtonBar();
-    }
-
-    /**
-     * Temporarily hides the reader mode button while the infobars are shown.
-     */
-    public void onShowInfobarContainer() {
-        mIsInfobarContainerShown = true;
-        mLayoutAnimations = null;
-        updateBottomButtonBar();
-    }
-
-    /**
-     * Re-shows the reader mode button if necessary once the infobars are dismissed.
-     */
-    public void onHideInfobarContainer() {
-        mIsInfobarContainerShown = false;
-        updateBottomButtonBar();
-    }
-
-    /**
-      * @param tab A {@link Tab}.
-      * @return The panel associated with a given Tab.
-      */
-    public static ReaderModePanel getReaderModePanel(Tab tab) {
-        ReaderModeManager manager = tab.getReaderModeManager();
-        if (manager == null) return null;
-        return manager.getReaderModePanel();
-    }
-}