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 6567672fc1691dab63e6e0ea8c9f33550a1f7ef6..bc7d55c9884e80f31772b71b6023ab065bedf70a 100644
--- a/ui/aura/window_tree_host.h
+++ b/ui/aura/window_tree_host.h
@@ -10,6 +10,7 @@
 #include "base/event_types.h"
 #include "base/message_loop/message_loop.h"
 #include "ui/aura/aura_export.h"
+#include "ui/aura/touch_ctm.h"
 #include "ui/base/cursor/cursor.h"
 #include "ui/gfx/native_widget_types.h"
 
@@ -57,6 +58,15 @@ class AURA_EXPORT WindowTreeHost {
 
   gfx::Transform GetInverseRootTransform() const;
 
+  void SetTouchCTM(int touch_device_id, const TouchCTM& ctm) {
+    touch_ctm_map_[touch_device_id] = ctm;
+  }
+  void ClearTouchCTM() { touch_ctm_map_.clear(); }
+
+  std::map<int, TouchCTM>* GetTouchCTMMap() {
+    return &touch_ctm_map_;
+  }
+
   // Updates the root window's size using |host_size|, current
   // transform and insets.
   void UpdateRootWindowSize(const gfx::Size& host_size);
@@ -180,6 +190,9 @@ class AURA_EXPORT WindowTreeHost {
 
   WindowTreeHostDelegate* delegate_;
 
+  // TouchCTM indexed by touch device id.
+  std::map<int, TouchCTM> touch_ctm_map_;
+
  private:
   // Moves the cursor to the specified location. This method is internally used
   // by MoveCursorTo() and MoveCursorToHostLocation().