Adds selection expansion support for Contextual Search.

content/browser/web_contents/web_contents_android.cc

Index: content/browser/web_contents/web_contents_android.cc
diff --git a/content/browser/web_contents/web_contents_android.cc b/content/browser/web_contents/web_contents_android.cc
index 099e62db1b7320f35352c2a4eca7f1662d7567a7..d26fe659dcebe16819ecbdd6530aea6ae836d469 100644
--- a/content/browser/web_contents/web_contents_android.cc
+++ b/content/browser/web_contents/web_contents_android.cc
@@ -395,6 +395,16 @@ void WebContentsAndroid::SelectWordAroundCaret(JNIEnv* env, jobject obj) {
   host->SelectWordAroundCaret();
 }
 
+void WebContentsAndroid::ExpandSelectionByCharacterOffset(JNIEnv* env,
+                                                          jobject obj,
+                                                          jint start_adjust,
+                                                          jint end_adjust) {
+  RenderViewHost* host = web_contents_->GetRenderViewHost();
+  if (!host)
+    return;
+  host->ExpandSelectionByCharacterOffset(start_adjust, end_adjust);
+}
+
 void WebContentsAndroid::EvaluateJavaScript(JNIEnv* env,
                                             jobject obj,
                                             jstring script,