customtabs: Histograms for special sessions prerendering.

chrome/android/java/src/org/chromium/chrome/browser/customtabs/ClientManager.java

Index: chrome/android/java/src/org/chromium/chrome/browser/customtabs/ClientManager.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/ClientManager.java b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/ClientManager.java
index 586ebeb9264761b13f0fb319e09fca3a1d69ab54..61bcd21bdd892aadc89415a739661125d171e3b7 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/ClientManager.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/ClientManager.java
@@ -94,6 +94,13 @@ class ClientManager {
         public long getLastMayLaunchUrlTimestamp() {
             return mLastMayLaunchUrlTimestamp;
         }
+
+        /**
+         * @return Whether the default parameters are used for this session.
+         */
+        public boolean isDefault() {
+            return !mIgnoreFragments && !mShouldPrerenderOnCellular;
+        }
     }
 
     private final Context mContext;
@@ -268,6 +275,15 @@ class ClientManager {
     }
 
     /**
+     * @return Whether the session is using the default parameters (that is,
+     *         don't ignore fragments and don't prerender on cellular connections).
+     */
+    public synchronized boolean usesDefaultSessionParameters(CustomTabsSessionToken session) {
+        SessionParams params = mSessionParams.get(session);
+        return params != null ? params.isDefault() : true;
+    }
+
+    /**
      * Sets whether prerender should be turned on for mobile networks for given session.
      */
     public synchronized void setPrerenderCellularForSession(