Fix processing of mouse events on MacViews.

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 47ccca96ad6dd866b986183dbbec4db376f85be6..0ebdc1c111c0d80b1015c09eed883bcc29aadefd 100644
--- a/ui/base/cocoa/base_view.mm
+++ b/ui/base/cocoa/base_view.mm
@@ -67,6 +67,52 @@ - (void)updateTrackingAreas {
   }
 }
 
+- (void)passMouseEventToSuperview:(NSEvent*)theEvent {
+  // NSView doesn't implement the generic mouseEvent:, so we have to send
+  // events using proper method.
+  switch ([theEvent type]) {
+    case NSLeftMouseDown:
+      [super mouseDown:theEvent];
+      break;
+    case NSLeftMouseUp:
+      [super mouseUp:theEvent];
+      break;
+    case NSRightMouseDown:
+      [super rightMouseDown:theEvent];
+      break;
+    case NSRightMouseUp:
+      [super rightMouseUp:theEvent];
+      break;
+    case NSOtherMouseDown:
+      [super otherMouseDown:theEvent];
+      break;
+    case NSOtherMouseUp:
+      [super otherMouseUp:theEvent];
+      break;
+    case NSMouseMoved:
+      [super mouseMoved:theEvent];
+      break;
+    case NSLeftMouseDragged:
+      [super mouseDragged:theEvent];
+      break;
+    case NSRightMouseDragged:
+      [super rightMouseDragged:theEvent];
+      break;
+    case NSOtherMouseDragged:
+      [super otherMouseDragged:theEvent];
+      break;
+    case NSMouseEntered:
+      [super mouseEntered:theEvent];
+      break;
+    case NSMouseExited:
+      [super mouseExited:theEvent];
+      break;
+    default:
+      NOTREACHED();
+      break;
+  }
+}
+
 - (void)mouseEvent:(NSEvent*)theEvent {
   // This method left intentionally blank.
 }