MacViews: Implement Tab Dragging

ui/views/cocoa/bridged_content_view.mm

Index: ui/views/cocoa/bridged_content_view.mm
diff --git a/ui/views/cocoa/bridged_content_view.mm b/ui/views/cocoa/bridged_content_view.mm
index 6d72fef5cf7ece1d35262f4b7b1a572622710f05..b410a6baaef94e66398f5e9257c8746801715233 100644
--- a/ui/views/cocoa/bridged_content_view.mm
+++ b/ui/views/cocoa/bridged_content_view.mm
@@ -23,6 +23,7 @@
 #import "ui/gfx/path_mac.h"
 #include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
 #include "ui/strings/grit/ui_strings.h"
+#include "ui/views/cocoa/cocoa_window_move_loop.h"
 #include "ui/views/controls/menu/menu_config.h"
 #include "ui/views/controls/menu/menu_controller.h"
 #include "ui/views/view.h"
@@ -32,6 +33,13 @@ using views::MenuController;
 
 namespace {
 
+// We're sending simulated mouse events in CocoaWindowMoveLoop, and don't want
+// BridgedContentView to react when we're starting/ending the RunMoveLoop.
+// When reattaching the dragged tab we're sending the mouse down event to the
+// parent window we don't have the pointer to, so this flag is global for the
+// RunMoveLoop.
+bool g_ignore_mouse_events = false;
+
 // Returns true if all four corners of |rect| are contained inside |path|.
 bool IsRectInsidePath(NSRect rect, NSBezierPath* path) {
   return [path containsPoint:rect.origin] &&
@@ -225,6 +233,10 @@ gfx::Rect GetFirstRectForRangeHelper(const ui::TextInputClient* client,
   return self;
 }
 
++ (void)setIgnoreMouseEvents:(BOOL)flag {
+  g_ignore_mouse_events = flag;
+}
+
 - (void)clearView {
   textInputClient_ = nullptr;
   hostedView_ = nullptr;
@@ -233,6 +245,11 @@ gfx::Rect GetFirstRectForRangeHelper(const ui::TextInputClient* client,
 }
 
 - (void)processCapturedMouseEvent:(NSEvent*)theEvent {
+  if (CGEventGetIntegerValueField([theEvent CGEvent], kCGEventSourceUserData) ==
+      views::kCocoaWindowMoveLoopSimulatedEventUserData) {
+    return;
+  }
+
   if (!hostedView_)
     return;
 
@@ -391,7 +408,12 @@ gfx::Rect GetFirstRectForRangeHelper(const ui::TextInputClient* client,
 // Translates the location of |theEvent| to toolkit-views coordinates and passes
 // the event to NativeWidgetMac for handling.
 - (void)mouseEvent:(NSEvent*)theEvent {
-  if (!hostedView_)
+  if (CGEventGetIntegerValueField([theEvent CGEvent], kCGEventSourceUserData) ==
+      views::kCocoaWindowMoveLoopSimulatedEventUserData) {
+    return;
+  }
+
+  if (!hostedView_ || g_ignore_mouse_events)
     return;
 
   ui::MouseEvent event(theEvent);