[Android] Select text when stylus first button is pressed.

content/browser/renderer_host/render_widget_host_view_android.h

Index: content/browser/renderer_host/render_widget_host_view_android.h
diff --git a/content/browser/renderer_host/render_widget_host_view_android.h b/content/browser/renderer_host/render_widget_host_view_android.h
index 4707734a8e86ed7c0df2d752fdb85d864bf95e9f..d9cddf54cfe0960ea44fa17ba2dd33773f19b347 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.h
+++ b/content/browser/renderer_host/render_widget_host_view_android.h
@@ -229,6 +229,8 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
       TextSurroundingSelectionCallback;
   void SetTextSurroundingSelectionCallback(
       const TextSurroundingSelectionCallback& callback);
+  bool ShouldTriggerOrUntriggerTextSelection(const ui::MotionEvent& event);
+  bool IsGestureTextSelectionTriggered() const;
 
  private:
   void RunAckCallbacks();
@@ -359,6 +361,7 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
   scoped_ptr<LastFrameInfo> last_frame_info_;
 
   TextSurroundingSelectionCallback text_surrounding_selection_callback_;
+  bool gesture_text_selection_triggered_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };