MacViews: Implement capture using NSEvent local+global monitors

ui/views/cocoa/bridged_native_widget.mm

Index: ui/views/cocoa/bridged_native_widget.mm
diff --git a/ui/views/cocoa/bridged_native_widget.mm b/ui/views/cocoa/bridged_native_widget.mm
index 1b8b098fbeb05a4bc5bd072dc665266e01a9ca20..591f4cba9f2232b5969c2d79e46de9a81c37cf90 100644
--- a/ui/views/cocoa/bridged_native_widget.mm
+++ b/ui/views/cocoa/bridged_native_widget.mm
@@ -15,6 +15,7 @@
 #include "ui/gfx/geometry/dip_util.h"
 #import "ui/gfx/mac/coordinate_conversion.h"
 #include "ui/gfx/screen.h"
+#import "ui/views/cocoa/cocoa_mouse_capture.h"
 #import "ui/views/cocoa/bridged_content_view.h"
 #import "ui/views/cocoa/views_nswindow_delegate.h"
 #include "ui/views/widget/native_widget_mac.h"
@@ -191,6 +192,22 @@ void BridgedNativeWidget::SetVisibilityState(WindowVisibilityState new_state) {
   NotifyVisibilityChangeDown();
 }
 
+void BridgedNativeWidget::AcquireCapture() {
+  DCHECK(!HasCapture());
+  if (!window_visible_)
+    return;  // Capture on hidden windows is disallowed.
+
+  mouse_capture_.reset(new CocoaMouseCapture(this));
+}
+
+void BridgedNativeWidget::ReleaseCapture() {
+  mouse_capture_.reset();
+}
+
+bool BridgedNativeWidget::HasCapture() {
+  return mouse_capture_ && mouse_capture_->IsActive();
+}
+
 void BridgedNativeWidget::OnWindowWillClose() {
   if (parent_)
     parent_->RemoveChildWindow(this);
@@ -294,6 +311,10 @@ void BridgedNativeWidget::OnVisibilityChangedTo(bool new_visibility) {
   if (window_visible_)
     wants_to_be_visible_ = true;
 
+  // Capture on hidden windows is not permitted.
+  if (!window_visible_)
+    mouse_capture_.reset();
+
   // TODO(tapted): Investigate whether we want this for Mac. This is what Aura
   // does, and it is what tests expect. However, because layer drawing is
   // asynchronous (and things like deminiaturize in AppKit are not), it can
@@ -383,6 +404,17 @@ void BridgedNativeWidget::DispatchKeyEventPostIME(const ui::KeyEvent& key) {
 }
 
 ////////////////////////////////////////////////////////////////////////////////
+// BridgedNativeWidget, CocoaMouseCaptureDelegate:
+
+void BridgedNativeWidget::PostCapturedEvent(NSEvent* event) {
+  [bridged_view_ processCapturedMouseEvent:event];
+}
+
+void BridgedNativeWidget::OnMouseCaptureLost() {
+  native_widget_mac_->GetWidget()->OnMouseCaptureLost();
+}
+
+////////////////////////////////////////////////////////////////////////////////
 // BridgedNativeWidget, FocusChangeListener:
 
 void BridgedNativeWidget::OnWillChangeFocus(View* focused_before,