Overlay content is its own class

chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayContentDelegate.java

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayContentDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayContentDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayContentDelegate.java
new file mode 100644
index 0000000000000000000000000000000000000000..d006a88d5dfde7d878666e84b89cf41a8ac6666a
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayContentDelegate.java
@@ -0,0 +1,77 @@
+// 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.bottombar;
+
+import org.chromium.chrome.browser.externalnav.ExternalNavigationHandler;
+import org.chromium.components.navigation_interception.NavigationParams;
+import org.chromium.content.browser.ContentViewCore;
+
+
+/**
+ * An base class for tracking events on the overlay panel.
+ */
+public class OverlayContentDelegate {
+
+    /**
+     * Called when the panel's ContentViewCore navigates in the main frame.
+     * @param url The URL being navigated to.
+     */
+    public void onMainFrameLoadStarted(String url) {}
+
+    /**
+     * Called when a page navigation results in an error page.
+     * @param url The URL that caused the failure.
+     * @param isFailure If the loaded page is an error page.
+     */
+    public void onMainFrameNavigation(String url, boolean isFailure) {}
+
+    /**
+     * Called when content started loading in the panel.
+     * @param url The URL that is loading.
+     */
+    public void onContentLoadStarted(String url) {}
+
+    /**
+     * Called when the panel content has finished loading.
+     */
+    public void onContentLoadFinished() {}
+
+    /**
+     * Determine if a particular navigation should be intercepted.
+     * @param externalNavHandler External navigation handler for the activity the panel is in.
+     * @param navigationParams The navigation params for the current navigation.
+     * @return True if the navigation should be intercepted.
+     */
+    public boolean shouldInterceptNavigation(ExternalNavigationHandler externalNavHandler,
+            NavigationParams navigationParams) {
+        return true;
+    }
+
+    // ============================================================================================
+    // ContentViewCore related events.
+    // ============================================================================================
+
+    /**
+     * Called then the content visibility is changed.
+     * @param isVisible True if the content is visible.
+     */
+    public void onVisibilityChanged(boolean isVisible) {}
+
+    /**
+     * Called once the ContentViewCore has been seen.
+     */
+    public void onContentViewSeen() {}
+
+    /**
+     * Called once the ContentViewCore has been created and set up completely.
+     * @param contentViewCore The contentViewCore that was created.
+     */
+    public void onContentViewCreated(ContentViewCore contentViewCore) {}
+
+    /**
+     * Called once the ContentViewCore has been destroyed.
+     */
+    public void onContentViewDestroyed() {}
+}