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

content/browser/renderer_host/input/motion_event_android.cc

Index: content/browser/renderer_host/input/motion_event_android.cc
diff --git a/content/browser/renderer_host/input/motion_event_android.cc b/content/browser/renderer_host/input/motion_event_android.cc
index 7409955bc9cb441978e306e5b8815c76900c6db7..c92dfc2fab4fbb1e929a5151519a04c09e0024c2 100644
--- a/content/browser/renderer_host/input/motion_event_android.cc
+++ b/content/browser/renderer_host/input/motion_event_android.cc
@@ -258,6 +258,14 @@ float MotionEventAndroid::GetHistoricalY(size_t pointer_index,
       AttachCurrentThread(), event_.obj(), pointer_index, historical_index));
 }
 
+int MotionEventAndroid::GetSource() const {
+  return Java_MotionEvent_getSource(AttachCurrentThread(), event_.obj());
+}
+
+int MotionEventAndroid::GetButtonState() const {
+  return Java_MotionEvent_getButtonState(AttachCurrentThread(), event_.obj());
+}
+
 scoped_ptr<ui::MotionEvent> MotionEventAndroid::Clone() const {
   return scoped_ptr<MotionEvent>(new MotionEventAndroid(*this));
 }