[Android] Upstream scene layers

chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/components/LayoutTab.java

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/components/LayoutTab.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/components/LayoutTab.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/components/LayoutTab.java
new file mode 100644
index 0000000000000000000000000000000000000000..2ff523f4424441aad1c6a6560db8eb91950c154c
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/components/LayoutTab.java
@@ -0,0 +1,937 @@
+// 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.layouts.components;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Color;
+import android.graphics.RectF;
+
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.Tab;
+import org.chromium.chrome.browser.compositor.layouts.ChromeAnimation;
+import org.chromium.chrome.browser.util.MathUtils;
+
+/**
+ * {@link LayoutTab} is used to keep track of a thumbnail's bitmap and position and to
+ * draw itself onto the GL canvas at the desired Y Offset.
+ */
+public class LayoutTab implements ChromeAnimation.Animatable<LayoutTab.Property> {
+    /**
+     * Properties that can be animated by using a
+     * {@link org.chromium.chrome.browser.compositor.layouts.ChromeAnimation.Animatable}.
+     */
+    public enum Property {
+        BORDER_ALPHA,
+        BORDER_SCALE,
+        ALPHA,
+        SATURATION,
+        STATIC_TO_VIEW_BLEND,
+        SCALE,
+        TILTX,
+        TILTY,
+        X,
+        Y,
+        MAX_CONTENT_WIDTH,
+        MAX_CONTENT_HEIGHT,
+        TOOLBAR_ALPHA,
+        DECORATION_ALPHA,
+        TOOLBAR_Y_OFFSET,
+        SIDE_BORDER_SCALE,
+    }
+
+    public static final float ALPHA_THRESHOLD = 1.0f / 255.0f;
+
+    private static final float SNAP_SPEED = 1.0f; // dp per second
+
+    // Public Layout constants.
+    public static final float CLOSE_BUTTON_WIDTH_DP = 36.f;
+
+    // Layout constants.
+    private static final float SHADOW_OPACITY = 1.f;
+    // TODO(dtrainor): Investigate removing this.
+    private static final float BORDER_THICKNESS_DP = 4.f;
+
+    // Cached values from values/dimens.xml
+    private static float sCompositorButtonSlop; // compositor_button_slop
+
+    private static float sDpToPx;
+    private static float sPxToDp;
+
+    private final int mId;
+    private final boolean mIsIncognito;
+
+    // Fields initialized in init()
+    private float mScale;
+    private float mTiltX; // angle in degrees.
+    private float mTiltY; // angle in degrees.
+    private float mTiltXPivotOffset;
+    private float mTiltYPivotOffset;
+    private float mX;
+    private float mY;
+    private float mRenderX;
+    private float mRenderY;
+    private float mClippedX; // The top left X offset of the clipped rectangle.
+    private float mClippedY; // The top left Y offset of the clipped rectangle.
+    private float mClippedWidth;
+    private float mClippedHeight;
+    private float mAlpha;
+    private float mSaturation;
+    private float mBorderAlpha;
+    private float mBorderCloseButtonAlpha;
+    private float mBorderScale;
+    private float mOriginalContentWidth;  // in dp.
+    private float mOriginalContentHeight; // in dp.
+    private float mMaxContentWidth;
+    private float mMaxContentHeight;
+    private float mStaticToViewBlend;
+    private float mBrightness;
+    private boolean mVisible;
+    private boolean mShouldStall;
+    private boolean mCanUseLiveTexture;
+    private boolean mShowToolbar;
+    private boolean mAnonymizeToolbar;
+    private float mToolbarAlpha;
+    private boolean mInsetBorderVertical;
+    private float mToolbarYOffset;
+    private float mSideBorderScale;
+
+    private final RectF mBounds = new RectF(); // Pre-allocated to avoid in-frame allocations.
+    private final RectF mClosePlacement = new RectF();
+
+    /** Whether we need to draw the decoration (border, shadow, ..) at all. */
+    private float mDecorationAlpha;
+
+    /**
+     * Whether this tab need to have its title texture generated. As this is not a free operation
+     * knowing that we won't show it might save a few cycles and memory.
+     */
+    private boolean mIsTitleNeeded = false;
+
+    /**
+     * Whether initFromHost() has been called since the last call to init().
+     */
+    private boolean mInitFromHostCalled = false;
+
+    // All the members bellow are initialized from the delayed initialization.
+    //
+    // Begin section --------------
+
+    /** The color of the background of the tab. Used as the best approximation to fill in. */
+    private int mBackgroundColor = Color.WHITE;
+
+    private int mFallbackThumbnailId = Tab.INVALID_TAB_ID;
+
+    // End section --------------
+
+    /**
+     * Default constructor for a {@link LayoutTab}.
+     *
+     * @param tabId                   The id of the source {@link Tab}.
+     * @param isIncognito             Whether the tab in the in the incognito stack.
+     * @param maxContentTextureWidth  The maximum width for drawing the content.
+     * @param maxContentTextureHeight The maximum height for drawing the content.
+     * @param showCloseButton         Whether a close button should be displayed in the corner.
+     * @param isTitleNeeded           Whether that tab need a title texture. This is an
+     *                                optimization to save cycles and memory. This is
+     *                                ignored if the title texture is already set.
+     */
+    public LayoutTab(int tabId, boolean isIncognito, float maxContentTextureWidth,
+            float maxContentTextureHeight, boolean showCloseButton, boolean isTitleNeeded) {
+        mId = tabId;
+        mIsIncognito = isIncognito;
+        init(maxContentTextureWidth, maxContentTextureHeight, showCloseButton, isTitleNeeded);
+    }
+
+    /**
+     * Initializes a {@link LayoutTab} to its default value so it can be reused.
+     *
+     * @param maxContentTextureWidth  The maximum width of the page content in dp.
+     * @param maxContentTextureHeight The maximum height of the page content in dp.
+     * @param showCloseButton         Whether to show the close button on the tab border.
+     * @param isTitleNeeded           Whether that tab need a title texture. This is an
+     *                                optimization to save cycles and memory. This is
+     *                                ignored if the title texture is already set.
+     */
+    public void init(float maxContentTextureWidth, float maxContentTextureHeight,
+            boolean showCloseButton, boolean isTitleNeeded) {
+        mAlpha = 1.0f;
+        mSaturation = 1.0f;
+        mBrightness = 1.0f;
+        mBorderAlpha = 1.0f;
+        mBorderCloseButtonAlpha = showCloseButton ? 1.f : 0.f;
+        mBorderScale = 1.0f;
+        mClippedX = 0.0f;
+        mClippedY = 0.0f;
+        mClippedWidth = Float.MAX_VALUE;
+        mClippedHeight = Float.MAX_VALUE;
+        mScale = 1.0f;
+        mTiltX = 0.0f;
+        mTiltY = 0.0f;
+        mVisible = true;
+        mX = 0.0f;
+        mY = 0.0f;
+        mRenderX = 0.0f;
+        mRenderY = 0.0f;
+        mStaticToViewBlend = 0.0f;
+        mDecorationAlpha = 1.0f;
+        mIsTitleNeeded = isTitleNeeded;
+        mCanUseLiveTexture = true;
+        mShowToolbar = false;
+        mAnonymizeToolbar = false;
+        mToolbarAlpha = 1.f;
+        mInsetBorderVertical = false;
+        mToolbarYOffset = 0.f;
+        mSideBorderScale = 1.f;
+        mOriginalContentWidth = maxContentTextureWidth;
+        mOriginalContentHeight = maxContentTextureHeight;
+        mMaxContentWidth = maxContentTextureWidth;
+        mMaxContentHeight = maxContentTextureHeight;
+
+        mInitFromHostCalled = false;
+    }
+
+    /**
+     * Initializes the {@link LayoutTab} from data extracted from a {@link Tab}.
+     * As this function may be expensive and can be delayed we initialize it as a separately.
+     *
+     * @param backgroundColor       The color of the page background.
+     * @param fallbackThumbnailId   The id of a cached thumbnail to show if the current
+     *                              thumbnail is unavailable, or {@link Tab.INVALID_TAB_ID}
+     *                              if none exists.
+     * @param shouldStall           Whether the tab should display a desaturated thumbnail and
+     *                              wait for the content layer to load.
+     * @param canUseLiveTexture     Whether the tab can use a live texture when being displayed.
+     */
+    public void initFromHost(int backgroundColor, int fallbackThumbnailId, boolean shouldStall,
+            boolean canUseLiveTexture) {
+        mBackgroundColor = backgroundColor;
+        mFallbackThumbnailId = fallbackThumbnailId;
+        mShouldStall = shouldStall;
+        mCanUseLiveTexture = canUseLiveTexture;
+        mInitFromHostCalled = true;
+    }
+
+    /**
+     * @return Whether {@link #initFromHost} needs to be called on this {@link LayoutTab}.
+     */
+    public boolean isInitFromHostNeeded() {
+        return !mInitFromHostCalled;
+    }
+
+    /**
+     * Helper function that gather the static constants from values/dimens.xml.
+     *
+     * @param context The Android Context.
+     */
+    public static void resetDimensionConstants(Context context) {
+        Resources res = context.getResources();
+        sDpToPx = res.getDisplayMetrics().density;
+        sPxToDp = 1.0f / sDpToPx;
+        sCompositorButtonSlop = res.getDimension(R.dimen.compositor_button_slop) * sPxToDp;
+    }
+
+    /**
+     * @return The slop amount in pixel to detect a touch on the tab.
+     */
+    public static float getTouchSlop() {
+        return sCompositorButtonSlop;
+    }
+
+    /**
+     * @return The scale applied to the the content of the tab. Default is 1.0.
+     */
+    public float getScale() {
+        return mScale;
+    }
+
+    /**
+     * @param scale The scale to apply on the content of the tab (everything except the borders).
+     */
+    public void setScale(float scale) {
+        mScale = scale;
+    }
+
+    /**
+     * @param tilt        The tilt angle around the X axis of the tab in degree.
+     * @param pivotOffset The offset of the X axis of the tilt pivot.
+     */
+    public void setTiltX(float tilt, float pivotOffset) {
+        mTiltX = tilt;
+        mTiltXPivotOffset = pivotOffset;
+    }
+
+    /**
+     * @return The tilt angle around the X axis of the tab in degree.
+     */
+    public float getTiltX() {
+        return mTiltX;
+    }
+
+    /**
+     * @return The offset of the X axis of the tilt pivot.
+     */
+    public float getTiltXPivotOffset() {
+        return mTiltXPivotOffset;
+    }
+
+    /**
+     * @param tilt        The tilt angle around the Y axis of the tab in degree.
+     * @param pivotOffset The offset of the Y axis of the tilt pivot.
+     */
+    public void setTiltY(float tilt, float pivotOffset) {
+        mTiltY = tilt;
+        mTiltYPivotOffset = pivotOffset;
+    }
+
+    /**
+     * @return The tilt angle around the Y axis of the tab in degree.
+     */
+    public float getTiltY() {
+        return mTiltY;
+    }
+
+    /**
+     * @return The offset of the Y axis of the tilt pivot.
+     */
+    public float getTiltYPivotOffset() {
+        return mTiltYPivotOffset;
+    }
+
+    /**
+     * Set the clipping offset. This apply on the scaled content.
+     *
+     * @param clippedX The top left X offset of the clipped rectangle.
+     * @param clippedY The top left Y offset of the clipped rectangle.
+     */
+    public void setClipOffset(float clippedX, float clippedY) {
+        mClippedX = clippedX;
+        mClippedY = clippedY;
+    }
+
+    /**
+     * Set the clipping sizes. This apply on the scaled content.
+     *
+     * @param clippedWidth  The width of the clipped rectangle. Float.MAX_VALUE for no clipping.
+     * @param clippedHeight The height of the clipped rectangle. Float.MAX_VALUE for no clipping.
+     */
+    public void setClipSize(float clippedWidth, float clippedHeight) {
+        mClippedWidth = clippedWidth;
+        mClippedHeight = clippedHeight;
+    }
+
+    /**
+     * @return The top left X offset of the clipped rectangle.
+     */
+    public float getClippedX() {
+        return mClippedX;
+    }
+
+    /**
+     * @return The top left Y offset of the clipped rectangle.
+     */
+    public float getClippedY() {
+        return mClippedY;
+    }
+
+    /**
+     * @return The width of the clipped rectangle. Float.MAX_VALUE for no clipping.
+     */
+    public float getClippedWidth() {
+        return mClippedWidth;
+    }
+
+    /**
+     * @return The height of the clipped rectangle. Float.MAX_VALUE for no clipping.
+     */
+    public float getClippedHeight() {
+        return mClippedHeight;
+    }
+
+    /**
+     * @return The maximum drawable width (scaled) of the tab contents in dp.
+     */
+    public float getScaledContentWidth() {
+        return getOriginalContentWidth() * mScale;
+    }
+
+    /**
+     * @return The maximum drawable height (scaled) of the tab contents in dp.
+     */
+    public float getScaledContentHeight() {
+        return getOriginalContentHeight() * mScale;
+    }
+
+    /**
+     * @return The maximum drawable width (not scaled) of the tab contents texture.
+     */
+    public float getOriginalContentWidth() {
+        return Math.min(mOriginalContentWidth, mMaxContentWidth);
+    }
+
+    /**
+     * @return The maximum drawable height (not scaled) of the tab contents texture.
+     */
+    public float getOriginalContentHeight() {
+        return Math.min(mOriginalContentHeight, mMaxContentHeight);
+    }
+
+    /**
+     * @return The original unclamped width (not scaled) of the tab contents texture.
+     */
+    public float getUnclampedOriginalContentHeight() {
+        return mOriginalContentHeight;
+    }
+
+    /**
+     * @return The width of the drawn content (clipped and scaled).
+     */
+    public float getFinalContentWidth() {
+        return Math.min(mClippedWidth, getScaledContentWidth());
+    }
+
+    /**
+     * @return The height of the drawn content (clipped and scaled).
+     */
+    public float getFinalContentHeight() {
+        return Math.min(mClippedHeight, getScaledContentHeight());
+    }
+
+    /**
+     * @return The maximum width the content can be.
+     */
+    public float getMaxContentWidth() {
+        return mMaxContentWidth;
+    }
+
+    /**
+     * @return The maximum height the content can be.
+     */
+    public float getMaxContentHeight() {
+        return mMaxContentHeight;
+    }
+
+    /**
+     * @param width The maximum width the content can be.
+     */
+    public void setMaxContentWidth(float width) {
+        mMaxContentWidth = width;
+    }
+
+    /**
+     * @param height The maximum height the content can be.
+     */
+    public void setMaxContentHeight(float height) {
+        mMaxContentHeight = height;
+    }
+
+    /**
+     * @return The id of the tab, same as the id from the Tab in TabModel.
+     */
+    public int getId() {
+        return mId;
+    }
+
+    /**
+     * @return Whether the underlying tab is incognito or not.
+     */
+    public boolean isIncognito() {
+        return mIsIncognito;
+    }
+
+    /**
+     * @param y The vertical draw position.
+     */
+    public void setY(float y) {
+        mY = y;
+    }
+
+    /**
+     * @return The vertical draw position for the update logic.
+     */
+    public float getY() {
+        return mY;
+    }
+
+    /**
+     * @return The vertical draw position for the renderer.
+     */
+    public float getRenderY() {
+        return mRenderY;
+    }
+
+    /**
+     * @param x The horizontal draw position.
+     */
+    public void setX(float x) {
+        mX = x;
+    }
+
+    /**
+     * @return The horizontal draw position for the update logic.
+     */
+    public float getX() {
+        return mX;
+    }
+
+    /**
+     * @return The horizontal draw position for the renderer.
+     */
+    public float getRenderX() {
+        return mRenderX;
+    }
+
+    /**
+     * Set the transparency value for all of the tab (the contents,
+     * border, etc...).  For components that allow specifying
+     * their own alpha values, it will use the min of these two fields.
+     *
+     * @param f The transparency value for the tab.
+     */
+    public void setAlpha(float f) {
+        mAlpha = f;
+    }
+
+    /**
+     * @return The transparency value for all of the tab components.
+     */
+    public float getAlpha() {
+        return mAlpha;
+    }
+
+    /**
+     * @return The opactiy of the tab's shadow.
+     */
+    public float getShadowOpacity() {
+        return SHADOW_OPACITY;
+    }
+
+    /**
+     * Set the saturation value for the tab contents.
+     *
+     * @param f The saturation value for the contents.
+     */
+    public void setSaturation(float f) {
+        mSaturation = f;
+    }
+
+    /**
+     * @return The saturation value for the tab contents.
+     */
+    public float getSaturation() {
+        return mSaturation;
+    }
+
+    /**
+     * @param alpha The maximum alpha value of the tab border.
+     */
+    public void setBorderAlpha(float alpha) {
+        mBorderAlpha = alpha;
+    }
+
+    /**
+     * @return The current alpha value at which the tab border is drawn.
+     */
+    public float getBorderAlpha() {
+        return mBorderAlpha;
+    }
+
+    /**
+     * @param alpha The maximum alpha value of the close button on the border.
+     */
+    public void setBorderCloseButtonAlpha(float alpha) {
+        mBorderCloseButtonAlpha = alpha;
+    }
+
+    /**
+     * @return The current alpha value at which the close button on the border is drawn.
+     */
+    public float getBorderCloseButtonAlpha() {
+        return mBorderCloseButtonAlpha;
+    }
+
+    /**
+     * @param scale The scale factor of the border.
+     *              1.0f yields 1:1 pixel with the source image.
+     */
+    public void setBorderScale(float scale) {
+        mBorderScale = scale;
+    }
+
+    /**
+     * @return The current scale applied on the tab border.
+     */
+    public float getBorderScale() {
+        return mBorderScale;
+    }
+
+    /**
+     * @param decorationAlpha Whether or not to draw the decoration for this card.
+     */
+    public void setDecorationAlpha(float decorationAlpha) {
+        mDecorationAlpha = decorationAlpha;
+    }
+
+    /**
+     * @return The opacity of the decoration.
+     */
+    public float getDecorationAlpha() {
+        return mDecorationAlpha;
+    }
+
+    /**
+     * @param toolbarYOffset The y offset of the toolbar.
+     */
+    public void setToolbarYOffset(float toolbarYOffset) {
+        mToolbarYOffset = toolbarYOffset;
+    }
+
+    /**
+     * @return The y offset of the toolbar.
+     */
+    public float getToolbarYOffset() {
+        return mToolbarYOffset;
+    }
+
+    /**
+     * @param scale The scale of the side border (from 0 to 1).
+     */
+    public void setSideBorderScale(float scale) {
+        mSideBorderScale = MathUtils.clamp(scale, 0.f, 1.f);
+    }
+
+    /**
+     * @return The scale of the side border (from 0 to 1).
+     */
+    public float getSideBorderScale() {
+        return mSideBorderScale;
+    }
+
+    /**
+     * @param brightness The brightness value to apply to the tab.
+     */
+    public void setBrightness(float brightness) {
+        mBrightness = brightness;
+    }
+
+    /**
+     * @return The brightness of the tab.
+     */
+    public float getBrightness() {
+        return mBrightness;
+    }
+
+    /**
+     * @param drawDecoration Whether or not to draw decoration.
+     */
+    public void setDrawDecoration(boolean drawDecoration) {
+        mDecorationAlpha = drawDecoration ? 1.0f : 0.0f;
+    }
+
+    /**
+     * @param percentageView The blend between the old static tab and the new live one.
+     */
+    public void setStaticToViewBlend(float percentageView) {
+        mStaticToViewBlend = percentageView;
+    }
+
+    /**
+     * @return The current blend between the old static tab and the new live one.
+     */
+    public float getStaticToViewBlend() {
+        return mStaticToViewBlend;
+    }
+
+    /**
+     * Computes the Manhattan-ish distance to the edge of the tab.
+     * This distance is good enough for click detection.
+     *
+     * @param x          X coordinate of the hit testing point.
+     * @param y          Y coordinate of the hit testing point.
+     * @return           The Manhattan-ish distance to the tab.
+     */
+    public float computeDistanceTo(float x, float y) {
+        final RectF bounds = getClickTargetBounds();
+        float dx = Math.max(bounds.left - x, x - bounds.right);
+        float dy = Math.max(bounds.top - y, y - bounds.bottom);
+        return Math.max(0.0f, Math.max(dx, dy));
+    }
+
+    /**
+     * @return The rectangle that represents the click target of the tab.
+     */
+    public RectF getClickTargetBounds() {
+        final float borderScaled = BORDER_THICKNESS_DP * mBorderScale;
+        mBounds.top = mY + mClippedY - borderScaled;
+        mBounds.bottom = mY + mClippedY + getFinalContentHeight() + borderScaled;
+        mBounds.left = mX + mClippedX - borderScaled;
+        mBounds.right = mX + mClippedX + getFinalContentWidth() + borderScaled;
+        return mBounds;
+    }
+
+    /**
+     * Tests if a point is inside the closing button of the tab.
+     *
+     * @param x     The horizontal coordinate of the hit testing point.
+     * @param y     The vertical coordinate of the hit testing point.
+     * @param isRTL Whether or not this is an RTL layout.
+     * @return      Whether the hit testing point is inside the tab.
+     */
+    public boolean checkCloseHitTest(float x, float y, boolean isRTL) {
+        RectF closeRectangle = getCloseBounds(isRTL);
+        return closeRectangle != null ? closeRectangle.contains(x, y) : false;
+    }
+
+    /**
+     * @param isRTL Whether or not this is an RTL layout.
+     * @return      The bounds of the active area of the close button. {@code null} if the close
+     *              button is not clickable.
+     */
+    public RectF getCloseBounds(boolean isRTL) {
+        if (!mIsTitleNeeded || !mVisible || mBorderCloseButtonAlpha < 0.5f || mBorderAlpha < 0.5f
+                || mBorderScale != 1.0f || Math.abs(mTiltX) > 1.0f || Math.abs(mTiltY) > 1.0f) {
+            return null;
+        }
+        mClosePlacement.set(0, 0, CLOSE_BUTTON_WIDTH_DP, CLOSE_BUTTON_WIDTH_DP);
+        if (!isRTL) mClosePlacement.offset(getFinalContentWidth() - mClosePlacement.width(), 0.f);
+
+        if (mClosePlacement.bottom > getFinalContentHeight()
+                || mClosePlacement.right > getFinalContentWidth()) {
+            return null;
+        }
+        mClosePlacement.offset(mX + mClippedX, mY + mClippedY);
+        mClosePlacement.inset(-sCompositorButtonSlop, -sCompositorButtonSlop);
+
+        return mClosePlacement;
+    }
+
+    /**
+     * Update snapping to pixel. To be called once every frame.
+     *
+     * @param dt The delta time between update frames in ms.
+     * @return   True if the snapping requests to render at least one more frame.
+     */
+    public boolean updateSnap(long dt) {
+        final float step = dt * SNAP_SPEED / 1000.0f;
+        final float x = updateSnap(step, mRenderX, mX);
+        final float y = updateSnap(step, mRenderY, mY);
+        final boolean change = x != mRenderX || y != mRenderY;
+        mRenderX = x;
+        mRenderY = y;
+        return change;
+    }
+
+    private float updateSnap(float step, float current, float ref) {
+        if (Math.abs(current - ref) > sPxToDp) return ref;
+        final float refRounded = Math.round(ref * sDpToPx) * sPxToDp;
+        if (refRounded < ref) {
+            current -= step;
+            current = Math.max(refRounded, current);
+        } else {
+            current += step;
+            current = Math.min(refRounded, current);
+        }
+        return current;
+    }
+
+    @Override
+    public String toString() {
+        return Integer.toString(getId());
+    }
+
+    /**
+     * @param originalContentWidth  The maximum content width for the given orientation.
+     * @param originalContentHeight The maximum content height for the given orientation.
+     */
+    public void setContentSize(float originalContentWidth, float originalContentHeight) {
+        mOriginalContentWidth = originalContentWidth;
+        mOriginalContentHeight = originalContentHeight;
+    }
+
+    /**
+     * @return Whether the tab title should be displayed.
+     */
+    public boolean isTitleNeeded() {
+        return mIsTitleNeeded;
+    }
+
+    /**
+     * @param visible True if the {@link LayoutTab} is visible and need to be drawn.
+     */
+    public void setVisible(boolean visible) {
+        mVisible = visible;
+    }
+
+    /**
+     * @return True if the {@link LayoutTab} is visible and will be drawn.
+     */
+    public boolean isVisible() {
+        return mVisible;
+    }
+
+    /**
+     * @param shouldStall Whether or not the tab should wait for the live layer to load.
+     */
+    public void setShouldStall(boolean shouldStall) {
+        mShouldStall = shouldStall;
+    }
+
+    /**
+     * @return Whether or not the tab should wait for the live layer to load.
+     */
+    public boolean shouldStall() {
+        return mShouldStall;
+    }
+
+    /**
+     * @return Whether the tab can use a live texture to render.
+     */
+    public boolean canUseLiveTexture() {
+        return mCanUseLiveTexture;
+    }
+
+    /**
+     * @param showToolbar Whether or not to show a toolbar at the top of the content.
+     */
+    public void setShowToolbar(boolean showToolbar) {
+        mShowToolbar = showToolbar;
+    }
+
+    /**
+     * @return Whether or not to show a toolbar at the top of the content.
+     */
+    public boolean showToolbar() {
+        return mShowToolbar;
+    }
+
+    /**
+     * This value is only used if {@link #showToolbar()} is {@code true}.
+     *
+     * @param anonymize Whether or not to anonymize the toolbar (hiding URL, etc.).
+     */
+    public void setAnonymizeToolbar(boolean anonymize) {
+        mAnonymizeToolbar = anonymize;
+    }
+
+    /**
+     * This value is only used if {@link #showToolbar()} is {@code true}.
+     *
+     * @return Whether or not to anonymize the toolbar (hiding URL, etc.).
+     */
+    public boolean anonymizeToolbar() {
+        return mAnonymizeToolbar;
+    }
+
+    /**
+     * @param alpha The alpha of the toolbar.
+     */
+    public void setToolbarAlpha(float alpha) {
+        mToolbarAlpha = alpha;
+    }
+
+    /**
+     * @return The alpha of the toolbar.
+     */
+    public float getToolbarAlpha() {
+        return mToolbarAlpha;
+    }
+
+    /**
+     * @param inset Whether or not to inset the top vertical component of the tab border or not.
+     */
+    public void setInsetBorderVertical(boolean inset) {
+        mInsetBorderVertical = inset;
+    }
+
+    /**
+     * @return Whether or not to inset the top vertical component of the tab border or not.
+     */
+    public boolean insetBorderVertical() {
+        return mInsetBorderVertical;
+    }
+
+    /**
+     * @return The theoretical number of visible pixels. 0 if invisible.
+     */
+    public float computeVisibleArea() {
+        return (mVisible && mAlpha > ALPHA_THRESHOLD ? 1.0f : 0.0f) * getFinalContentWidth()
+                * getFinalContentHeight();
+    }
+
+    /**
+     * @return The color of the background of the tab. Used as the best approximation to fill in.
+     */
+    public int getBackgroundColor() {
+        return mBackgroundColor;
+    }
+
+    /**
+     * @return The id of a snapshot that would be acceptable to use if the snapshot for this tab
+     *         is unavailable.
+     */
+    public int getFallbackThumbnailId() {
+        return mFallbackThumbnailId;
+    }
+
+    /**
+     * Callback for {@link com.google.android.apps.chrome.ChromeAnimation.Animatable}
+     *
+     * @param prop The property to set
+     * @param val The value to set it to
+     */
+    @Override
+    public void setProperty(Property prop, float val) {
+        switch (prop) {
+            case BORDER_ALPHA:
+                setBorderAlpha(val);
+                break;
+            case BORDER_SCALE:
+                setBorderScale(val);
+                break;
+            case ALPHA:
+                setAlpha(val);
+                break;
+            case SATURATION:
+                setSaturation(val);
+                break;
+            case STATIC_TO_VIEW_BLEND:
+                setStaticToViewBlend(val);
+                break;
+            case SCALE:
+                setScale(val);
+                break;
+            case TILTX:
+                setTiltX(val, mTiltXPivotOffset);
+                break;
+            case TILTY:
+                setTiltY(val, mTiltYPivotOffset);
+                break;
+            case X:
+                setX(val);
+                break;
+            case Y:
+                setY(val);
+                break;
+            case MAX_CONTENT_WIDTH:
+                setMaxContentWidth(val);
+                break;
+            case MAX_CONTENT_HEIGHT:
+                setMaxContentHeight(val);
+                break;
+            case TOOLBAR_ALPHA:
+                setToolbarAlpha(val);
+                break;
+            case DECORATION_ALPHA:
+                setDecorationAlpha(val);
+                break;
+            case TOOLBAR_Y_OFFSET:
+                setToolbarYOffset(val);
+                break;
+            case SIDE_BORDER_SCALE:
+                setSideBorderScale(val);
+                break;
+        }
+    }
+}