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

content/browser/renderer_host/input/motion_event_web.cc

Index: content/browser/renderer_host/input/motion_event_web.cc
diff --git a/content/browser/renderer_host/input/motion_event_web.cc b/content/browser/renderer_host/input/motion_event_web.cc
index d1ff8a3c84f7baa22a46da6f2294c934a0cb5ee9..d6771be36e6ca269dadb5f680f863fa6547f03e4 100644
--- a/content/browser/renderer_host/input/motion_event_web.cc
+++ b/content/browser/renderer_host/input/motion_event_web.cc
@@ -143,6 +143,16 @@ float MotionEventWeb::GetHistoricalY(size_t pointer_index,
   return 0.f;
 }
 
+int MotionEventWeb::GetSource() const {
+  NOTIMPLEMENTED();
+  return 0;
+}
+
+int MotionEventWeb::GetButtonState() const {
+  NOTIMPLEMENTED();
+  return 0;
+}
+
 scoped_ptr<ui::MotionEvent> MotionEventWeb::Clone() const {
   return scoped_ptr<MotionEvent>(new MotionEventWeb(event_));
 }