Revert of [Contextual Search] Remove opt-in code.

chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/contextualsearch/ContextualSearchPanelDelegate.java

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/contextualsearch/ContextualSearchPanelDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/contextualsearch/ContextualSearchPanelDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/contextualsearch/ContextualSearchPanelDelegate.java
index 581a9a21408f0c393337307c28566a9790a95aa3..55ab8e09467fd49eecb28d322964c963b8052fb0 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/contextualsearch/ContextualSearchPanelDelegate.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/contextualsearch/ContextualSearchPanelDelegate.java
@@ -54,6 +54,23 @@
     void updateBasePageSelectionYPx(float y);
 
     /**
+     * Sets the content height of the First Run Flow Panel.
+     * @param height The content height of the First Run Flow Panel.
+     */
+    void setPromoContentHeight(float height);
+
+    /**
+     * @param shouldHidePromoHeader Sets whether the First Run Flow's header
+     *            should be hidden.
+     */
+    void setShouldHidePromoHeader(boolean shouldHidePromoHeader);
+
+    /**
+     * Animates the Contextual Search panel after first-run success.
+     */
+    void animateAfterFirstRunSuccess();
+
+    /**
      * Handles the onLoadStarted event in the WebContents.
      */
     void onLoadStarted();