Add a flag use_software_compositing to the Widget::InitParams structure.

ui/views/widget/widget.cc

Index: ui/views/widget/widget.cc
diff --git a/ui/views/widget/widget.cc b/ui/views/widget/widget.cc
index 154d107a63b298fbb7f6d0eb764d924ecc1a734b..e1fc508d798f0d5ca94f7ee9050a231c2c09ccb9 100644
--- a/ui/views/widget/widget.cc
+++ b/ui/views/widget/widget.cc
@@ -123,7 +123,8 @@ Widget::InitParams::InitParams()
       desktop_window_tree_host(NULL),
       layer_type(ui::LAYER_TEXTURED),
       context(NULL),
-      force_show_in_taskbar(false) {
+      force_show_in_taskbar(false),
+      force_software_compositing(false) {
 }
 
 Widget::InitParams::InitParams(Type type)
@@ -146,7 +147,8 @@ Widget::InitParams::InitParams(Type type)
       desktop_window_tree_host(NULL),
       layer_type(ui::LAYER_TEXTURED),
       context(NULL),
-      force_show_in_taskbar(false) {
+      force_show_in_taskbar(false),
+      force_software_compositing(false) {
 }
 
 Widget::InitParams::~InitParams() {