Upstream Layout.java and associated files

chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/LayoutUpdateHost.java

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/LayoutUpdateHost.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/LayoutUpdateHost.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/LayoutUpdateHost.java
new file mode 100644
index 0000000000000000000000000000000000000000..d45062f48f9b5057c9fdd3234c14f74a1c3e6e30
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/LayoutUpdateHost.java
@@ -0,0 +1,82 @@
+// 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;
+
+import org.chromium.chrome.browser.Tab;
+import org.chromium.chrome.browser.compositor.layouts.components.LayoutTab;
+
+/**
+ * {@link LayoutRenderHost} is the minimal interface the layouts need to know about its host to
+ * update.
+ */
+public interface LayoutUpdateHost {
+    /**
+     * Requests a next update to refresh the transforms and changing properties. The update occurs
+     * once a frame. This is requesting a new frame to be updated and rendered (no need to call
+     * {@link LayoutRenderHost#requestRender()}).
+     */
+    void requestUpdate();
+
+    /**
+     * Tells its host {@link android.view.View} that the hide will be an animation away.
+     * This is to be called from a {@link Layout}.
+     * @param nextTabId          The id of the next tab.
+     * @param hintAtTabSelection Whether or not to hint about a new tab being selected.
+     */
+    void startHiding(int nextTabId, boolean hintAtTabSelection);
+
+    /**
+     * Tells its host {@link android.view.View} that the Layout has done all animation so the view
+     * can hide. This is to be called from a {@link Layout}.
+     */
+    void doneHiding();
+
+    /**
+     * Tells its host that the Layout is done it's preliminary showing animation.
+     */
+    void doneShowing();
+
+    /**
+     * @param layout The {@link Layout} being evaluated.
+     * @return Whether the given {@link Layout} is being displayed.
+     */
+    boolean isActiveLayout(Layout layout);
+
+    /**
+     * Initializes {@link org.chromium.chrome.browser.compositor.layouts.components.LayoutTab} with
+     * data accessible only from the {@link LayoutUpdateHost} such as data extracted out of a
+     * {@link Tab}.
+     *
+     * @param tabId The id of the
+     *              {@link org.chromium.chrome.browser.compositor.layouts.components.LayoutTab}
+     *              to be initialized from a {@link Tab}.
+     */
+    void initLayoutTabFromHost(final int tabId);
+
+    /**
+     * Creates or recycles a {@Link LayoutTab}.
+     *
+     * @param id               The id of the reference tab in the
+     *                         {@link org.chromium.chrome.browser.tabmodel.TabModel}.
+     * @param incognito        Whether the new tab is incognito.
+     * @param showCloseButton  True to show and activate a close button on the border.
+     * @param isTitleNeeded    Whether a title will be shown.
+     * @param maxContentWidth  The maximum layout width this tab can be.  Negative numbers will use
+     *                         the original content width.
+     * @param maxContentHeight The maximum layout height this tab can be.  Negative numbers will use
+     *                         the original content height.
+     * @return                 The created or recycled {@link LayoutTab}.
+     */
+    LayoutTab createLayoutTab(int id, boolean incognito, boolean showCloseButton,
+            boolean isTitleNeeded, float maxContentWidth, float maxContentHeight);
+
+    /**
+     * Notifies the host that the {@link LayoutTab} is no longer needed by the layout.
+     *
+     * @param id The id of the reference tab in the
+     *           {@link org.chromium.chrome.browser.tabmodel.TabModel}.
+     */
+    void releaseTabLayout(int id);
+}