[ContextualSearch] Adds long press promo for Contextual Search.

chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchPolicy.java

Index: chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchPolicy.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchPolicy.java b/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchPolicy.java
index b7c134d46e2a60ac6ac9210c0d1b47f271e78aef..b7da20b266ae7e53bf201457264cf565b3ef22d4 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchPolicy.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchPolicy.java
@@ -36,7 +36,7 @@ class ContextualSearchPolicy {
     private boolean mDecidedStateForTesting;
     private boolean mDidResetCounters;
 
-    static ContextualSearchPolicy getInstance(Context context) {
+    public static ContextualSearchPolicy getInstance(Context context) {
         if (sInstance == null) {
             sInstance = new ContextualSearchPolicy(context);
         }
@@ -150,6 +150,44 @@ class ContextualSearchPolicy {
     }
 
     /**
+     * @return Whether the Peek promo is available to be shown above the Search Bar.
+     */
+    public boolean isPeekPromoAvailable(ContextualSearchSelectionController controller) {
+        // Allow Promo to be forcefully enabled for testing.
+        if (ContextualSearchFieldTrial.isPeekPromoForced()) return true;
+
+        // Check for several conditions to determine whether the Peek Promo is available.
+
+        // 1) Enabled by Finch.
+        if (!ContextualSearchFieldTrial.isPeekPromoEnabled()) return false;
+
+        // 2) If the Panel was never opened.
+        if (getPromoOpenCount() > 0) return false;
+
+        // 3) User has not opted in.
+        if (!isUserUndecided()) return false;
+
+        // 4) Selection was caused by a long press.
+        if (controller.getSelectionType() != SelectionType.LONG_PRESS) return false;
+
+        // 5) Promo was not shown more than the maximum number of times defined by Finch.
+        final int maxShowCount = ContextualSearchFieldTrial.getPeekPromoMaxShowCount();
+        final int peekPromoShowCount = mPreferenceManager.getContextualSearchPeekPromoShowCount();
+        if (peekPromoShowCount >= maxShowCount) return false;
+
+        // 6) Only then, show the promo.
+        return true;
+    }
+
+    /**
+     * Register that the Peek Promo was seen.
+     */
+    public void registerPeekPromoSeen() {
+        final int peekPromoShowCount = mPreferenceManager.getContextualSearchPeekPromoShowCount();
+        mPreferenceManager.setContextualSearchPeekPromoShowCount(peekPromoShowCount + 1);
+    }
+
+    /**
      * Registers that a tap has taken place by incrementing tap-tracking counters.
      */
     void registerTap() {