Add movement information to PPB_MouseInputEvent.

ppapi/shared_impl/input_event_impl.cc

Index: ppapi/shared_impl/input_event_impl.cc
diff --git a/ppapi/shared_impl/input_event_impl.cc b/ppapi/shared_impl/input_event_impl.cc
index 3b455b61b13c4c4f20b94331c1ecf812ad28861a..8dc653a8d3fbc581cbd292f6cc3cac0ff304a60d 100644
--- a/ppapi/shared_impl/input_event_impl.cc
+++ b/ppapi/shared_impl/input_event_impl.cc
@@ -19,6 +19,7 @@ InputEventData::InputEventData()
       mouse_button(PP_INPUTEVENT_MOUSEBUTTON_NONE),
       mouse_position(PP_MakePoint(0, 0)),
       mouse_click_count(0),
+      mouse_movement(PP_MakePoint(0, 0)),
       wheel_delta(PP_MakeFloatPoint(0.0f, 0.0f)),
       wheel_ticks(PP_MakeFloatPoint(0.0f, 0.0f)),
       wheel_scroll_by_page(false),
@@ -75,6 +76,10 @@ int32_t InputEventImpl::GetMouseClickCount() {
   return data_.mouse_click_count;
 }
 
+PP_Point InputEventImpl::GetMouseMovement() {
+  return data_.mouse_movement;
+}
+
 PP_FloatPoint InputEventImpl::GetWheelDelta() {
   return data_.wheel_delta;
 }