[Contextual Search] Trigger the translation one-box.

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..495fe54fb166edfff5ffdcb865a68bb84a8bf894 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
@@ -5,6 +5,7 @@
 package org.chromium.chrome.browser.contextualsearch;
 
 import android.content.Context;
+import android.text.TextUtils;
 
 import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.browser.ChromeVersionInfo;
@@ -318,6 +319,19 @@ class ContextualSearchPolicy {
         return mPreferenceManager.getContextualSearchTapCount();
     }
 
+    /**
+     * Determines whether translation is needed between the given languages.
+     * @param source The source language code; language we're translating from.
+     * @param target The target language code; language we're translating to.
+     * @return Whether translation is needed or not.
+     */
+    boolean needsTranslation(@Nullable String source, @Nullable String target) {
+        // For now, we just check to see if the major language is the same, ignoring
+        // local variations, so pt-BR will match pt-PT.  We do this because it
+        // seems unlikely the user would want translations from different dialects.
+        return !TextUtils.equals(source.substring(0, 2), target.substring(0, 2));

[pedro (no code reviews), 2015/09/23 18:33:54]

I think we should also take into consideration other factors, like languages
that the user has set up on their phone or Android keyboard (you can choose
multiple languages).

[Donn Denman, 2015/10/09 22:08:23]

Done.

+    }
+
     // --------------------------------------------------------------------------------------------
     // Private helpers.
     // --------------------------------------------------------------------------------------------