Move touch CTM from X into Chrome

ui/aura/window_tree_host.h

Index: ui/aura/window_tree_host.h
diff --git a/ui/aura/window_tree_host.h b/ui/aura/window_tree_host.h
index 39864531c6dcfea22900af285afdd5e56c0eac5c..01742ee7b208d93487e85461902a107f0456270e 100644
--- a/ui/aura/window_tree_host.h
+++ b/ui/aura/window_tree_host.h
@@ -114,6 +114,15 @@ class AURA_EXPORT WindowTreeHost {
 
   gfx::NativeCursor last_cursor() const { return last_cursor_; }
 
+  void UpdateDisplayID(int64 id1, int64 id2) {
+    display_ids_.first = id1;
+    display_ids_.second = id2;
+  }
+
+  const std::pair<int64, int64>& display_ids() const {
+    return display_ids_;
+  }
+
   // Returns the accelerated widget.
   virtual gfx::AcceleratedWidget GetAcceleratedWidget() = 0;
 
@@ -218,6 +227,13 @@ class AURA_EXPORT WindowTreeHost {
 
   scoped_ptr<ui::ViewProp> prop_;
 
+  // The display IDs associated with this root window.
+  // In single monitor or extended mode dual monitor case, the root window
+  // is associated with one display.
+  // In mirror mode dual monitors case, the root window is associated with
+  // both displays.
+  std::pair<int64, int64> display_ids_;
+
   DISALLOW_COPY_AND_ASSIGN(WindowTreeHost);
 };