Add SetScale to PPB_WidgetDev, use scale for painting

ppapi/thunk/ppb_widget_thunk.cc

Index: ppapi/thunk/ppb_widget_thunk.cc
diff --git a/ppapi/thunk/ppb_widget_thunk.cc b/ppapi/thunk/ppb_widget_thunk.cc
index 94833ebc2868e8e9137e566318b0c3149c44e3dd..f00b48b3d9b71d81da06e866ede8d65ff5e73c0c 100644
--- a/ppapi/thunk/ppb_widget_thunk.cc
+++ b/ppapi/thunk/ppb_widget_thunk.cc
@@ -44,7 +44,13 @@ void SetLocation(PP_Resource widget, const PP_Rect* location) {
     enter.object()->SetLocation(location);
 }
 
-const PPB_Widget_Dev g_ppb_widget_thunk = {
+void SetScale(PP_Resource widget, float scale) {
+  EnterResource<PPB_Widget_API> enter(widget, false);
+  if (enter.succeeded())
+    enter.object()->SetScale(scale);
+}
+
+const PPB_Widget_Dev_0_3 g_ppb_widget_thunk_0_3 = {
   &IsWidget,
   &Paint,
   &HandleEvent,
@@ -52,10 +58,23 @@ const PPB_Widget_Dev g_ppb_widget_thunk = {
   &SetLocation,
 };
 
+const PPB_Widget_Dev_0_4 g_ppb_widget_thunk_0_4 = {
+  &IsWidget,
+  &Paint,
+  &HandleEvent,
+  &GetLocation,
+  &SetLocation,
+  &SetScale
+};
+
 }  // namespace
 
 const PPB_Widget_Dev_0_3* GetPPB_Widget_Dev_0_3_Thunk() {
-  return &g_ppb_widget_thunk;
+  return &g_ppb_widget_thunk_0_3;
+}
+
+const PPB_Widget_Dev_0_4* GetPPB_Widget_Dev_0_4_Thunk() {
+  return &g_ppb_widget_thunk_0_4;
 }
 
 }  // namespace thunk