Look Up on Force Touch

ui/base/cocoa/base_view.mm

Index: ui/base/cocoa/base_view.mm
diff --git a/ui/base/cocoa/base_view.mm b/ui/base/cocoa/base_view.mm
index fdc58fcb0e32334a699056b21e89ca88ed29c4d7..9642fbe1a81f3b8bf64a6853ab441af32c30194c 100644
--- a/ui/base/cocoa/base_view.mm
+++ b/ui/base/cocoa/base_view.mm
@@ -78,6 +78,10 @@ NSString* kSelectionDirection = @"Chromium.kSelectionDirection";
   return kEventNotHandled;
 }
 
+- (void)forceTouchEvent:(NSEvent*)theEvent {
+  // This method left intentionally blank.
+}
+
 - (void)mouseDown:(NSEvent*)theEvent {
   dragging_ = YES;
   [self mouseEvent:theEvent];
@@ -166,6 +170,19 @@ NSString* kSelectionDirection = @"Chromium.kSelectionDirection";
     [super keyUp:theEvent];
 }
 
+- (void)pressureChangeWithEvent:(NSEvent*)theEvent {
+  NSInteger newStage = [theEvent stage];
+  if (pressureEventStage_ == newStage)
+    return;
+
+  // Call the force touch event when the stage reaches 2, which is the value
+  // for force touch.
+  if (newStage == 2) {
+    [self forceTouchEvent:theEvent];
+  }
+  pressureEventStage_ = newStage;
+}
+
 - (void)flagsChanged:(NSEvent*)theEvent {
   if ([self keyEvent:theEvent] != kEventHandled)
     [super flagsChanged:theEvent];