Rewrite release event only if press event was rewritten for a given device.

chrome/browser/ui/ash/event_rewriter.cc

Index: chrome/browser/ui/ash/event_rewriter.cc
diff --git a/chrome/browser/ui/ash/event_rewriter.cc b/chrome/browser/ui/ash/event_rewriter.cc
index d323f7404dcd7a6ac0a2a04835913bec51655c64..6fed7d2110b4932dd3a7c0be3f565b2d230bd497 100644
--- a/chrome/browser/ui/ash/event_rewriter.cc
+++ b/chrome/browser/ui/ash/event_rewriter.cc
@@ -1003,7 +1003,9 @@ void EventRewriter::RewriteLocatedEvent(ui::LocatedEvent* event) {
   xievent->mods.effective = remapped_native_modifiers;
 
   // Then, remap Alt+Button1 to Button3.
-  if ((xievent->mods.effective & Mod1Mask) && xievent->detail == 1) {
+  if ((xievent->evtype == XI_ButtonPress ||
+       pressed_device_ids_.count(xievent->sourceid)) &&
+      (xievent->mods.effective & Mod1Mask) && xievent->detail == 1) {
     xievent->mods.effective &= ~Mod1Mask;
     xievent->detail = 3;
     if (xievent->evtype == XI_ButtonRelease) {
@@ -1012,6 +1014,9 @@ void EventRewriter::RewriteLocatedEvent(ui::LocatedEvent* event) {
       XISetMask(xievent->buttons.mask, 3);
       XIClearMask(xievent->buttons.mask, 1);
       xievent->mods.effective &= ~Button1Mask;
+      pressed_device_ids_.erase(xievent->sourceid);
+    } else {
+      pressed_device_ids_.insert(xievent->sourceid);
     }
   }