[Contextual Search] Adds basic support for narrow Search Panel.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchFieldTrial.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchFieldTrial.java b/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchFieldTrial.java
index 61a451b53f45ff4fa92e18d5892226885c58c0dd..0778a0525822aaaa1f372d41c6465677b174ebea 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchFieldTrial.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchFieldTrial.java
@@ -45,6 +45,8 @@ public class ContextualSearchFieldTrial {
     static final String SELECTION_EXPANSION_DISABLED =
             "contextual_search_selection_expansion_disabled";
 
+    static final String NARROW_PANEL_SUPPORTED = "contextual_search_narrow_panel_supported";
+
     private static final String CHINESE_LANGUAGE_CODE = "zh";
     private static final String JAPANESE_LANGUAGE_CODE = "ja";
     private static final String KOREAN_LANGUAGE_CODE = "ko";
@@ -260,6 +262,13 @@ public class ContextualSearchFieldTrial {
         return getBooleanParam(SELECTION_EXPANSION_DISABLED);
     }
 
+    /**
+     * @return Whether the narrow version of the Search Panel is supported.
+     */
+    public static boolean isNarrowPanelSupported() {
+        return getBooleanParam(NARROW_PANEL_SUPPORTED);
+    }
+
     // --------------------------------------------------------------------------------------------
     // Helpers.
     // --------------------------------------------------------------------------------------------