Adds selection expansion support for Contextual Search.

content/browser/renderer_host/render_view_host_impl.h

Index: content/browser/renderer_host/render_view_host_impl.h
diff --git a/content/browser/renderer_host/render_view_host_impl.h b/content/browser/renderer_host/render_view_host_impl.h
index 6e14b189003d87f160db5e5be37557cce9c5f2b8..6d169ce96e160ecca180f395c07f63e5ff02c8bb 100644
--- a/content/browser/renderer_host/render_view_host_impl.h
+++ b/content/browser/renderer_host/render_view_host_impl.h
@@ -177,6 +177,8 @@ class CONTENT_EXPORT RenderViewHostImpl
   void UpdateWebkitPreferences(const WebPreferences& prefs) override;
   void OnWebkitPreferencesChanged() override;
   void SelectWordAroundCaret() override;
+  void ExpandSelectionByCharacterOffset(int startAdjust,
+                                        int endAdjust) override;
 
 #if defined(OS_ANDROID)
   void ActivateNearestFindResult(int request_id, float x, float y) override;