[ContextualSearch] Adds long press promo for Contextual Search.

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 5966c82cfdf3e1fc38c197762461634a55853b1b..33a5649b9b1bfa179a16b590a7df60ee53c8f975 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
@@ -9,6 +9,7 @@ import org.chromium.chrome.browser.ChromeActivity;
 import org.chromium.chrome.browser.compositor.bottombar.OverlayPanelContent;
 import org.chromium.chrome.browser.compositor.bottombar.contextualsearch.ContextualSearchPanel.PanelState;
 import org.chromium.chrome.browser.compositor.bottombar.contextualsearch.ContextualSearchPanel.StateChangeReason;
+import org.chromium.chrome.browser.compositor.layouts.ChromeAnimation;
 import org.chromium.content.browser.ContentViewCore;
 
 /**
@@ -93,10 +94,14 @@ public interface ContextualSearchPanelDelegate {
     void setDidSearchInvolvePromo();
 
     /**
-     * Sets whether the promo is active.
-     * @param shown Whether the promo is active.
+     * @param isActive Whether the promo is active.
      */
-    void setIsPromoActive(boolean shown);
+    void setIsPromoActive(boolean isActive);
+
+    /**
+     * Shows the peek promo.
+     */
+    void showPeekPromo();
 
     /**
      * Gets whether a touch on the search content view has been done yet or not.
@@ -187,6 +192,12 @@ public interface ContextualSearchPanelDelegate {
     void setSearchContentViewVisibility(boolean isVisible);
 
     /**
+     * Creates an {@link org.chromium.chrome.browser.compositor.layouts.ChromeAnimation.Animatable}
+     * and adds it to the animation, setting the start value at the beginning of the animation.
+     */
+    <T extends Enum<?>> void addToAnimation(ChromeAnimation.Animatable<T> object, T prop,
+                                            float start, float end, long duration, long startTime);
+    /**
      * @param panelContent The OverlayPanelContent that this panel should use.
      */
     @VisibleForTesting