Add movement information to PPB_MouseInputEvent.

ppapi/cpp/input_event.h

Index: ppapi/cpp/input_event.h
diff --git a/ppapi/cpp/input_event.h b/ppapi/cpp/input_event.h
index f634cb95b8c244acc7c5633babb7e46da6fb8139..f414b6f95c6327e63fe40ab926b6276ab2757f6c 100644
--- a/ppapi/cpp/input_event.h
+++ b/ppapi/cpp/input_event.h
@@ -123,13 +123,15 @@ class MouseInputEvent : public InputEvent {
   /// @param[in] click_count
   /// TODO(brettw) figure out exactly what this means.
   ///
+  /// @param[in] mouse_movement The change in position of the mouse.
   MouseInputEvent(Instance* instance,
                   PP_InputEvent_Type type,
                   PP_TimeTicks time_stamp,
                   uint32_t modifiers,
                   PP_InputEvent_MouseButton mouse_button,
                   const Point& mouse_position,
-                  int32_t click_count);
+                  int32_t click_count,
+                  const Point& mouse_movement);
 
   /// GetButton() returns the mouse position for a mouse input event.
   ///
@@ -148,6 +150,15 @@ class MouseInputEvent : public InputEvent {
 
   // TODO(brettw) figure out exactly what this means.
   int32_t GetClickCount() const;
+
+  /// Returns the change in position of the mouse. When the cursor lock is
+  /// enabled, although the mouse position doesn't actually change, this
+  /// function continues to provide movement information as when the cursor is
+  /// unlocked.
+  ///
+  /// @return The change in position of the mouse, relative to the previous
+  /// position.
+  Point GetMovement() const;
 };
 
 class WheelInputEvent : public InputEvent {