Add an interface to gather text surrounding the selection.

content/browser/renderer_host/render_widget_host_view_android.cc

Index: content/browser/renderer_host/render_widget_host_view_android.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_android.cc b/content/browser/renderer_host/render_widget_host_view_android.cc
index 120161d67e823db56a39e5bace562b2155e70849..f4217357c753379b26a0ac67d7a27ff0d0c22425 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -433,10 +433,21 @@ void RenderWidgetHostViewAndroid::UnlockCompositingSurface() {
   }
 }
 
+void RenderWidgetHostViewAndroid::SetTextSurroundingSelectionCallback(
+    const TextSurroundingSelectionCallback& callback) {
+  // Only one outstanding request is allowed at any given time.
+  DCHECK(!callback.is_null());
+  text_surrounding_selection_callback_ = callback;
+}
+
 void RenderWidgetHostViewAndroid::OnTextSurroundingSelectionResponse(
     const base::string16& content,
     size_t start_offset,
     size_t end_offset) {
+  if (text_surrounding_selection_callback_.is_null())
+    return;
+  text_surrounding_selection_callback_.Run(content, start_offset, end_offset);
+  text_surrounding_selection_callback_.Reset();
 }
 
 void RenderWidgetHostViewAndroid::ReleaseLocksOnSurface() {